| /* |
| * Copyright (c) 1994, 2011, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| package java.lang; |
| |
| import java.io.InputStream; |
| import java.io.IOException; |
| import java.io.File; |
| import java.lang.reflect.Constructor; |
| import java.lang.reflect.InvocationTargetException; |
| import java.net.MalformedURLException; |
| import java.net.URL; |
| import java.security.AccessController; |
| import java.security.AccessControlContext; |
| import java.security.CodeSource; |
| import java.security.Policy; |
| import java.security.PrivilegedAction; |
| import java.security.PrivilegedActionException; |
| import java.security.PrivilegedExceptionAction; |
| import java.security.ProtectionDomain; |
| import java.security.cert.Certificate; |
| import java.util.Collections; |
| import java.util.Enumeration; |
| import java.util.HashMap; |
| import java.util.HashSet; |
| import java.util.Set; |
| import java.util.Stack; |
| import java.util.Map; |
| import java.util.Vector; |
| import java.util.Hashtable; |
| import java.util.WeakHashMap; |
| import java.util.concurrent.ConcurrentHashMap; |
| import sun.misc.ClassFileTransformer; |
| import sun.misc.CompoundEnumeration; |
| import sun.misc.Resource; |
| import sun.misc.URLClassPath; |
| import sun.misc.VM; |
| import sun.reflect.CallerSensitive; |
| import sun.reflect.Reflection; |
| import sun.security.util.SecurityConstants; |
| |
| /** |
| * A class loader is an object that is responsible for loading classes. The |
| * class <tt>ClassLoader</tt> is an abstract class. Given the <a |
| * href="#name">binary name</a> of a class, a class loader should attempt to |
| * locate or generate data that constitutes a definition for the class. A |
| * typical strategy is to transform the name into a file name and then read a |
| * "class file" of that name from a file system. |
| * |
| * <p> Every {@link Class <tt>Class</tt>} object contains a {@link |
| * Class#getClassLoader() reference} to the <tt>ClassLoader</tt> that defined |
| * it. |
| * |
| * <p> <tt>Class</tt> objects for array classes are not created by class |
| * loaders, but are created automatically as required by the Java runtime. |
| * The class loader for an array class, as returned by {@link |
| * Class#getClassLoader()} is the same as the class loader for its element |
| * type; if the element type is a primitive type, then the array class has no |
| * class loader. |
| * |
| * <p> Applications implement subclasses of <tt>ClassLoader</tt> in order to |
| * extend the manner in which the Java virtual machine dynamically loads |
| * classes. |
| * |
| * <p> Class loaders may typically be used by security managers to indicate |
| * security domains. |
| * |
| * <p> The <tt>ClassLoader</tt> class uses a delegation model to search for |
| * classes and resources. Each instance of <tt>ClassLoader</tt> has an |
| * associated parent class loader. When requested to find a class or |
| * resource, a <tt>ClassLoader</tt> instance will delegate the search for the |
| * class or resource to its parent class loader before attempting to find the |
| * class or resource itself. The virtual machine's built-in class loader, |
| * called the "bootstrap class loader", does not itself have a parent but may |
| * serve as the parent of a <tt>ClassLoader</tt> instance. |
| * |
| * <p> Class loaders that support concurrent loading of classes are known as |
| * <em>parallel capable</em> class loaders and are required to register |
| * themselves at their class initialization time by invoking the |
| * {@link |
| * #registerAsParallelCapable <tt>ClassLoader.registerAsParallelCapable</tt>} |
| * method. Note that the <tt>ClassLoader</tt> class is registered as parallel |
| * capable by default. However, its subclasses still need to register themselves |
| * if they are parallel capable. <br> |
| * In environments in which the delegation model is not strictly |
| * hierarchical, class loaders need to be parallel capable, otherwise class |
| * loading can lead to deadlocks because the loader lock is held for the |
| * duration of the class loading process (see {@link #loadClass |
| * <tt>loadClass</tt>} methods). |
| * |
| * <p> Normally, the Java virtual machine loads classes from the local file |
| * system in a platform-dependent manner. For example, on UNIX systems, the |
| * virtual machine loads classes from the directory defined by the |
| * <tt>CLASSPATH</tt> environment variable. |
| * |
| * <p> However, some classes may not originate from a file; they may originate |
| * from other sources, such as the network, or they could be constructed by an |
| * application. The method {@link #defineClass(String, byte[], int, int) |
| * <tt>defineClass</tt>} converts an array of bytes into an instance of class |
| * <tt>Class</tt>. Instances of this newly defined class can be created using |
| * {@link Class#newInstance <tt>Class.newInstance</tt>}. |
| * |
| * <p> The methods and constructors of objects created by a class loader may |
| * reference other classes. To determine the class(es) referred to, the Java |
| * virtual machine invokes the {@link #loadClass <tt>loadClass</tt>} method of |
| * the class loader that originally created the class. |
| * |
| * <p> For example, an application could create a network class loader to |
| * download class files from a server. Sample code might look like: |
| * |
| * <blockquote><pre> |
| * ClassLoader loader = new NetworkClassLoader(host, port); |
| * Object main = loader.loadClass("Main", true).newInstance(); |
| * . . . |
| * </pre></blockquote> |
| * |
| * <p> The network class loader subclass must define the methods {@link |
| * #findClass <tt>findClass</tt>} and <tt>loadClassData</tt> to load a class |
| * from the network. Once it has downloaded the bytes that make up the class, |
| * it should use the method {@link #defineClass <tt>defineClass</tt>} to |
| * create a class instance. A sample implementation is: |
| * |
| * <blockquote><pre> |
| * class NetworkClassLoader extends ClassLoader { |
| * String host; |
| * int port; |
| * |
| * public Class findClass(String name) { |
| * byte[] b = loadClassData(name); |
| * return defineClass(name, b, 0, b.length); |
| * } |
| * |
| * private byte[] loadClassData(String name) { |
| * // load the class data from the connection |
| * . . . |
| * } |
| * } |
| * </pre></blockquote> |
| * |
| * <h4> <a name="name">Binary names</a> </h4> |
| * |
| * <p> Any class name provided as a {@link String} parameter to methods in |
| * <tt>ClassLoader</tt> must be a binary name as defined by |
| * <cite>The Java™ Language Specification</cite>. |
| * |
| * <p> Examples of valid class names include: |
| * <blockquote><pre> |
| * "java.lang.String" |
| * "javax.swing.JSpinner$DefaultEditor" |
| * "java.security.KeyStore$Builder$FileBuilder$1" |
| * "java.net.URLClassLoader$3$1" |
| * </pre></blockquote> |
| * |
| * @see #resolveClass(Class) |
| * @since 1.0 |
| */ |
| public abstract class ClassLoader { |
| |
| private static native void registerNatives(); |
| static { |
| registerNatives(); |
| } |
| |
| // The parent class loader for delegation |
| // Note: VM hardcoded the offset of this field, thus all new fields |
| // must be added *after* it. |
| private final ClassLoader parent; |
| |
| /** |
| * Encapsulates the set of parallel capable loader types. |
| */ |
| private static class ParallelLoaders { |
| private ParallelLoaders() {} |
| |
| // the set of parallel capable loader types |
| private static final Set<Class<? extends ClassLoader>> loaderTypes = |
| Collections.newSetFromMap( |
| new WeakHashMap<Class<? extends ClassLoader>, Boolean>()); |
| static { |
| synchronized (loaderTypes) { loaderTypes.add(ClassLoader.class); } |
| } |
| |
| /** |
| * Registers the given class loader type as parallel capabale. |
| * Returns {@code true} is successfully registered; {@code false} if |
| * loader's super class is not registered. |
| */ |
| static boolean register(Class<? extends ClassLoader> c) { |
| synchronized (loaderTypes) { |
| if (loaderTypes.contains(c.getSuperclass())) { |
| // register the class loader as parallel capable |
| // if and only if all of its super classes are. |
| // Note: given current classloading sequence, if |
| // the immediate super class is parallel capable, |
| // all the super classes higher up must be too. |
| loaderTypes.add(c); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| /** |
| * Returns {@code true} if the given class loader type is |
| * registered as parallel capable. |
| */ |
| static boolean isRegistered(Class<? extends ClassLoader> c) { |
| synchronized (loaderTypes) { |
| return loaderTypes.contains(c); |
| } |
| } |
| } |
| |
| // Maps class name to the corresponding lock object when the current |
| // class loader is parallel capable. |
| // Note: VM also uses this field to decide if the current class loader |
| // is parallel capable and the appropriate lock object for class loading. |
| private final ConcurrentHashMap<String, Object> parallelLockMap; |
| |
| // Hashtable that maps packages to certs |
| private final Map <String, Certificate[]> package2certs; |
| |
| // Shared among all packages with unsigned classes |
| private static final Certificate[] nocerts = new Certificate[0]; |
| |
| // The classes loaded by this class loader. The only purpose of this table |
| // is to keep the classes from being GC'ed until the loader is GC'ed. |
| private final Vector<Class<?>> classes = new Vector<>(); |
| |
| // The "default" domain. Set as the default ProtectionDomain on newly |
| // created classes. |
| private final ProtectionDomain defaultDomain = |
| new ProtectionDomain(new CodeSource(null, (Certificate[]) null), |
| null, this, null); |
| |
| // The initiating protection domains for all classes loaded by this loader |
| private final Set<ProtectionDomain> domains; |
| |
| // Invoked by the VM to record every loaded class with this loader. |
| void addClass(Class c) { |
| classes.addElement(c); |
| } |
| |
| // The packages defined in this class loader. Each package name is mapped |
| // to its corresponding Package object. |
| // @GuardedBy("itself") |
| private final HashMap<String, Package> packages = new HashMap<>(); |
| |
| private static Void checkCreateClassLoader() { |
| SecurityManager security = System.getSecurityManager(); |
| if (security != null) { |
| security.checkCreateClassLoader(); |
| } |
| return null; |
| } |
| |
| private ClassLoader(Void unused, ClassLoader parent) { |
| this.parent = parent; |
| if (ParallelLoaders.isRegistered(this.getClass())) { |
| parallelLockMap = new ConcurrentHashMap<>(); |
| package2certs = new ConcurrentHashMap<>(); |
| domains = |
| Collections.synchronizedSet(new HashSet<ProtectionDomain>()); |
| assertionLock = new Object(); |
| } else { |
| // no finer-grained lock; lock on the classloader instance |
| parallelLockMap = null; |
| package2certs = new Hashtable<>(); |
| domains = new HashSet<>(); |
| assertionLock = this; |
| } |
| } |
| |
| /** |
| * Creates a new class loader using the specified parent class loader for |
| * delegation. |
| * |
| * <p> If there is a security manager, its {@link |
| * SecurityManager#checkCreateClassLoader() |
| * <tt>checkCreateClassLoader</tt>} method is invoked. This may result in |
| * a security exception. </p> |
| * |
| * @param parent |
| * The parent class loader |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * <tt>checkCreateClassLoader</tt> method doesn't allow creation |
| * of a new class loader. |
| * |
| * @since 1.2 |
| */ |
| protected ClassLoader(ClassLoader parent) { |
| this(checkCreateClassLoader(), parent); |
| } |
| |
| /** |
| * Creates a new class loader using the <tt>ClassLoader</tt> returned by |
| * the method {@link #getSystemClassLoader() |
| * <tt>getSystemClassLoader()</tt>} as the parent class loader. |
| * |
| * <p> If there is a security manager, its {@link |
| * SecurityManager#checkCreateClassLoader() |
| * <tt>checkCreateClassLoader</tt>} method is invoked. This may result in |
| * a security exception. </p> |
| * |
| * @throws SecurityException |
| * If a security manager exists and its |
| * <tt>checkCreateClassLoader</tt> method doesn't allow creation |
| * of a new class loader. |
| */ |
| protected ClassLoader() { |
| this(checkCreateClassLoader(), getSystemClassLoader()); |
| } |
| |
| // -- Class -- |
| |
| /** |
| * Loads the class with the specified <a href="#name">binary name</a>. |
| * This method searches for classes in the same manner as the {@link |
| * #loadClass(String, boolean)} method. It is invoked by the Java virtual |
| * machine to resolve class references. Invoking this method is equivalent |
| * to invoking {@link #loadClass(String, boolean) <tt>loadClass(name, |
| * false)</tt>}. </p> |
| * |
| * @param name |
| * The <a href="#name">binary name</a> of the class |
| * |
| * @return The resulting <tt>Class</tt> object |
| * |
| * @throws ClassNotFoundException |
| * If the class was not found |
| */ |
| public Class<?> loadClass(String name) throws ClassNotFoundException { |
| return loadClass(name, false); |
| } |
| |
| /** |
| * Loads the class with the specified <a href="#name">binary name</a>. The |
| * default implementation of this method searches for classes in the |
| * following order: |
| * |
| * <p><ol> |
| * |
| * <li><p> Invoke {@link #findLoadedClass(String)} to check if the class |
| * has already been loaded. </p></li> |
| * |
| * <li><p> Invoke the {@link #loadClass(String) <tt>loadClass</tt>} method |
| * on the parent class loader. If the parent is <tt>null</tt> the class |
| * loader built-in to the virtual machine is used, instead. </p></li> |
| * |
| * <li><p> Invoke the {@link #findClass(String)} method to find the |
| * class. </p></li> |
| * |
| * </ol> |
| * |
| * <p> If the class was found using the above steps, and the |
| * <tt>resolve</tt> flag is true, this method will then invoke the {@link |
| * #resolveClass(Class)} method on the resulting <tt>Class</tt> object. |
| * |
| * <p> Subclasses of <tt>ClassLoader</tt> are encouraged to override {@link |
| * #findClass(String)}, rather than this method. </p> |
| * |
| * <p> Unless overridden, this method synchronizes on the result of |
| * {@link #getClassLoadingLock <tt>getClassLoadingLock</tt>} method |
| * during the entire class loading process. |
| * |
| * @param name |
| * The <a href="#name">binary name</a> of the class |
| * |
| * @param resolve |
| * If <tt>true</tt> then resolve the class |
| * |
| * @return The resulting <tt>Class</tt> object |
| * |
| * @throws ClassNotFoundException |
| * If the class could not be found |
| */ |
| protected Class<?> loadClass(String name, boolean resolve) |
| throws ClassNotFoundException |
| { |
| synchronized (getClassLoadingLock(name)) { |
| // First, check if the class has already been loaded |
| Class c = findLoadedClass(name); |
| if (c == null) { |
| long t0 = System.nanoTime(); |
| try { |
| if (parent != null) { |
| c = parent.loadClass(name, false); |
| } else { |
| c = findBootstrapClassOrNull(name); |
| } |
| } catch (ClassNotFoundException e) { |
| // ClassNotFoundException thrown if class not found |
| // from the non-null parent class loader |
| } |
| |
| if (c == null) { |
| // If still not found, then invoke findClass in order |
| // to find the class. |
| long t1 = System.nanoTime(); |
| c = findClass(name); |
| |
| // this is the defining class loader; record the stats |
| sun.misc.PerfCounter.getParentDelegationTime().addTime(t1 - t0); |
| sun.misc.PerfCounter.getFindClassTime().addElapsedTimeFrom(t1); |
| sun.misc.PerfCounter.getFindClasses().increment(); |
| } |
| } |
| if (resolve) { |
| resolveClass(c); |
| } |
| return c; |
| } |
| } |
| |
| /** |
| * Returns the lock object for class loading operations. |
| * For backward compatibility, the default implementation of this method |
| * behaves as follows. If this ClassLoader object is registered as |
| * parallel capable, the method returns a dedicated object associated |
| * with the specified class name. Otherwise, the method returns this |
| * ClassLoader object. </p> |
| * |
| * @param className |
| * The name of the to-be-loaded class |
| * |
| * @return the lock for class loading operations |
| * |
| * @throws NullPointerException |
| * If registered as parallel capable and <tt>className</tt> is null |
| * |
| * @see #loadClass(String, boolean) |
| * |
| * @since 1.7 |
| */ |
| protected Object getClassLoadingLock(String className) { |
| Object lock = this; |
| if (parallelLockMap != null) { |
| Object newLock = new Object(); |
| lock = parallelLockMap.putIfAbsent(className, newLock); |
| if (lock == null) { |
| lock = newLock; |
| } |
| } |
| return lock; |
| } |
| |
| // This method is invoked by the virtual machine to load a class. |
| private Class loadClassInternal(String name) |
| throws ClassNotFoundException |
| { |
| // For backward compatibility, explicitly lock on 'this' when |
| // the current class loader is not parallel capable. |
| if (parallelLockMap == null) { |
| synchronized (this) { |
| return loadClass(name); |
| } |
| } else { |
| return loadClass(name); |
| } |
| } |
| |
| // Invoked by the VM after loading class with this loader. |
| private void checkPackageAccess(Class cls, ProtectionDomain pd) { |
| final SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| final String name = cls.getName(); |
| final int i = name.lastIndexOf('.'); |
| if (i != -1) { |
| AccessController.doPrivileged(new PrivilegedAction<Void>() { |
| public Void run() { |
| sm.checkPackageAccess(name.substring(0, i)); |
| return null; |
| } |
| }, new AccessControlContext(new ProtectionDomain[] {pd})); |
| } |
| } |
| domains.add(pd); |
| } |
| |
| /** |
| * Finds the class with the specified <a href="#name">binary name</a>. |
| * This method should be overridden by class loader implementations that |
| * follow the delegation model for loading classes, and will be invoked by |
| * the {@link #loadClass <tt>loadClass</tt>} method after checking the |
| * parent class loader for the requested class. The default implementation |
| * throws a <tt>ClassNotFoundException</tt>. </p> |
| * |
| * @param name |
| * The <a href="#name">binary name</a> of the class |
| * |
| * @return The resulting <tt>Class</tt> object |
| * |
| * @throws ClassNotFoundException |
| * If the class could not be found |
| * |
| * @since 1.2 |
| */ |
| protected Class<?> findClass(String name) throws ClassNotFoundException { |
| throw new ClassNotFoundException(name); |
| } |
| |
| /** |
| * Converts an array of bytes into an instance of class <tt>Class</tt>. |
| * Before the <tt>Class</tt> can be used it must be resolved. This method |
| * is deprecated in favor of the version that takes a <a |
| * href="#name">binary name</a> as its first argument, and is more secure. |
| * |
| * @param b |
| * The bytes that make up the class data. The bytes in positions |
| * <tt>off</tt> through <tt>off+len-1</tt> should have the format |
| * of a valid class file as defined by |
| * <cite>The Java™ Virtual Machine Specification</cite>. |
| * |
| * @param off |
| * The start offset in <tt>b</tt> of the class data |
| * |
| * @param len |
| * The length of the class data |
| * |
| * @return The <tt>Class</tt> object that was created from the specified |
| * class data |
| * |
| * @throws ClassFormatError |
| * If the data did not contain a valid class |
| * |
| * @throws IndexOutOfBoundsException |
| * If either <tt>off</tt> or <tt>len</tt> is negative, or if |
| * <tt>off+len</tt> is greater than <tt>b.length</tt>. |
| * |
| * @throws SecurityException |
| * If an attempt is made to add this class to a package that |
| * contains classes that were signed by a different set of |
| * certificates than this class, or if an attempt is made |
| * to define a class in a package with a fully-qualified name |
| * that starts with "{@code java.}". |
| * |
| * @see #loadClass(String, boolean) |
| * @see #resolveClass(Class) |
| * |
| * @deprecated Replaced by {@link #defineClass(String, byte[], int, int) |
| * defineClass(String, byte[], int, int)} |
| */ |
| @Deprecated |
| protected final Class<?> defineClass(byte[] b, int off, int len) |
| throws ClassFormatError |
| { |
| return defineClass(null, b, off, len, null); |
| } |
| |
| /** |
| * Converts an array of bytes into an instance of class <tt>Class</tt>. |
| * Before the <tt>Class</tt> can be used it must be resolved. |
| * |
| * <p> This method assigns a default {@link java.security.ProtectionDomain |
| * <tt>ProtectionDomain</tt>} to the newly defined class. The |
| * <tt>ProtectionDomain</tt> is effectively granted the same set of |
| * permissions returned when {@link |
| * java.security.Policy#getPermissions(java.security.CodeSource) |
| * <tt>Policy.getPolicy().getPermissions(new CodeSource(null, null))</tt>} |
| * is invoked. The default domain is created on the first invocation of |
| * {@link #defineClass(String, byte[], int, int) <tt>defineClass</tt>}, |
| * and re-used on subsequent invocations. |
| * |
| * <p> To assign a specific <tt>ProtectionDomain</tt> to the class, use |
| * the {@link #defineClass(String, byte[], int, int, |
| * java.security.ProtectionDomain) <tt>defineClass</tt>} method that takes a |
| * <tt>ProtectionDomain</tt> as one of its arguments. </p> |
| * |
| * @param name |
| * The expected <a href="#name">binary name</a> of the class, or |
| * <tt>null</tt> if not known |
| * |
| * @param b |
| * The bytes that make up the class data. The bytes in positions |
| * <tt>off</tt> through <tt>off+len-1</tt> should have the format |
| * of a valid class file as defined by |
| * <cite>The Java™ Virtual Machine Specification</cite>. |
| * |
| * @param off |
| * The start offset in <tt>b</tt> of the class data |
| * |
| * @param len |
| * The length of the class data |
| * |
| * @return The <tt>Class</tt> object that was created from the specified |
| * class data. |
| * |
| * @throws ClassFormatError |
| * If the data did not contain a valid class |
| * |
| * @throws IndexOutOfBoundsException |
| * If either <tt>off</tt> or <tt>len</tt> is negative, or if |
| * <tt>off+len</tt> is greater than <tt>b.length</tt>. |
| * |
| * @throws SecurityException |
| * If an attempt is made to add this class to a package that |
| * contains classes that were signed by a different set of |
| * certificates than this class (which is unsigned), or if |
| * <tt>name</tt> begins with "<tt>java.</tt>". |
| * |
| * @see #loadClass(String, boolean) |
| * @see #resolveClass(Class) |
| * @see java.security.CodeSource |
| * @see java.security.SecureClassLoader |
| * |
| * @since 1.1 |
| */ |
| protected final Class<?> defineClass(String name, byte[] b, int off, int len) |
| throws ClassFormatError |
| { |
| return defineClass(name, b, off, len, null); |
| } |
| |
| /* Determine protection domain, and check that: |
| - not define java.* class, |
| - signer of this class matches signers for the rest of the classes in |
| package. |
| */ |
| private ProtectionDomain preDefineClass(String name, |
| ProtectionDomain pd) |
| { |
| if (!checkName(name)) |
| throw new NoClassDefFoundError("IllegalName: " + name); |
| |
| if ((name != null) && name.startsWith("java.")) { |
| throw new SecurityException |
| ("Prohibited package name: " + |
| name.substring(0, name.lastIndexOf('.'))); |
| } |
| if (pd == null) { |
| pd = defaultDomain; |
| } |
| |
| if (name != null) checkCerts(name, pd.getCodeSource()); |
| |
| return pd; |
| } |
| |
| private String defineClassSourceLocation(ProtectionDomain pd) |
| { |
| CodeSource cs = pd.getCodeSource(); |
| String source = null; |
| if (cs != null && cs.getLocation() != null) { |
| source = cs.getLocation().toString(); |
| } |
| return source; |
| } |
| |
| private Class defineTransformedClass(String name, byte[] b, int off, int len, |
| ProtectionDomain pd, |
| ClassFormatError cfe, String source) |
| throws ClassFormatError |
| { |
| // Class format error - try to transform the bytecode and |
| // define the class again |
| // |
| ClassFileTransformer[] transformers = |
| ClassFileTransformer.getTransformers(); |
| Class c = null; |
| |
| if (transformers != null) { |
| for (ClassFileTransformer transformer : transformers) { |
| try { |
| // Transform byte code using transformer |
| byte[] tb = transformer.transform(b, off, len); |
| c = defineClass1(name, tb, 0, tb.length, |
| pd, source); |
| break; |
| } catch (ClassFormatError cfe2) { |
| // If ClassFormatError occurs, try next transformer |
| } |
| } |
| } |
| |
| // Rethrow original ClassFormatError if unable to transform |
| // bytecode to well-formed |
| // |
| if (c == null) |
| throw cfe; |
| |
| return c; |
| } |
| |
| private void postDefineClass(Class c, ProtectionDomain pd) |
| { |
| if (pd.getCodeSource() != null) { |
| Certificate certs[] = pd.getCodeSource().getCertificates(); |
| if (certs != null) |
| setSigners(c, certs); |
| } |
| } |
| |
| /** |
| * Converts an array of bytes into an instance of class <tt>Class</tt>, |
| * with an optional <tt>ProtectionDomain</tt>. If the domain is |
| * <tt>null</tt>, then a default domain will be assigned to the class as |
| * specified in the documentation for {@link #defineClass(String, byte[], |
| * int, int)}. Before the class can be used it must be resolved. |
| * |
| * <p> The first class defined in a package determines the exact set of |
| * certificates that all subsequent classes defined in that package must |
| * contain. The set of certificates for a class is obtained from the |
| * {@link java.security.CodeSource <tt>CodeSource</tt>} within the |
| * <tt>ProtectionDomain</tt> of the class. Any classes added to that |
| * package must contain the same set of certificates or a |
| * <tt>SecurityException</tt> will be thrown. Note that if |
| * <tt>name</tt> is <tt>null</tt>, this check is not performed. |
| * You should always pass in the <a href="#name">binary name</a> of the |
| * class you are defining as well as the bytes. This ensures that the |
| * class you are defining is indeed the class you think it is. |
| * |
| * <p> The specified <tt>name</tt> cannot begin with "<tt>java.</tt>", since |
| * all classes in the "<tt>java.*</tt> packages can only be defined by the |
| * bootstrap class loader. If <tt>name</tt> is not <tt>null</tt>, it |
| * must be equal to the <a href="#name">binary name</a> of the class |
| * specified by the byte array "<tt>b</tt>", otherwise a {@link |
| * <tt>NoClassDefFoundError</tt>} will be thrown. </p> |
| * |
| * @param name |
| * The expected <a href="#name">binary name</a> of the class, or |
| * <tt>null</tt> if not known |
| * |
| * @param b |
| * The bytes that make up the class data. The bytes in positions |
| * <tt>off</tt> through <tt>off+len-1</tt> should have the format |
| * of a valid class file as defined by |
| * <cite>The Java™ Virtual Machine Specification</cite>. |
| * |
| * @param off |
| * The start offset in <tt>b</tt> of the class data |
| * |
| * @param len |
| * The length of the class data |
| * |
| * @param protectionDomain |
| * The ProtectionDomain of the class |
| * |
| * @return The <tt>Class</tt> object created from the data, |
| * and optional <tt>ProtectionDomain</tt>. |
| * |
| * @throws ClassFormatError |
| * If the data did not contain a valid class |
| * |
| * @throws NoClassDefFoundError |
| * If <tt>name</tt> is not equal to the <a href="#name">binary |
| * name</a> of the class specified by <tt>b</tt> |
| * |
| * @throws IndexOutOfBoundsException |
| * If either <tt>off</tt> or <tt>len</tt> is negative, or if |
| * <tt>off+len</tt> is greater than <tt>b.length</tt>. |
| * |
| * @throws SecurityException |
| * If an attempt is made to add this class to a package that |
| * contains classes that were signed by a different set of |
| * certificates than this class, or if <tt>name</tt> begins with |
| * "<tt>java.</tt>". |
| */ |
| protected final Class<?> defineClass(String name, byte[] b, int off, int len, |
| ProtectionDomain protectionDomain) |
| throws ClassFormatError |
| { |
| protectionDomain = preDefineClass(name, protectionDomain); |
| |
| Class c = null; |
| String source = defineClassSourceLocation(protectionDomain); |
| |
| try { |
| c = defineClass1(name, b, off, len, protectionDomain, source); |
| } catch (ClassFormatError cfe) { |
| c = defineTransformedClass(name, b, off, len, protectionDomain, cfe, |
| source); |
| } |
| |
| postDefineClass(c, protectionDomain); |
| return c; |
| } |
| |
| /** |
| * Converts a {@link java.nio.ByteBuffer <tt>ByteBuffer</tt>} |
| * into an instance of class <tt>Class</tt>, |
| * with an optional <tt>ProtectionDomain</tt>. If the domain is |
| * <tt>null</tt>, then a default domain will be assigned to the class as |
| * specified in the documentation for {@link #defineClass(String, byte[], |
| * int, int)}. Before the class can be used it must be resolved. |
| * |
| * <p>The rules about the first class defined in a package determining the |
| * set of certificates for the package, and the restrictions on class names |
| * are identical to those specified in the documentation for {@link |
| * #defineClass(String, byte[], int, int, ProtectionDomain)}. |
| * |
| * <p> An invocation of this method of the form |
| * <i>cl</i><tt>.defineClass(</tt><i>name</i><tt>,</tt> |
| * <i>bBuffer</i><tt>,</tt> <i>pd</i><tt>)</tt> yields exactly the same |
| * result as the statements |
| * |
| * <blockquote><tt> |
| * ...<br> |
| * byte[] temp = new byte[</tt><i>bBuffer</i><tt>.{@link |
| * java.nio.ByteBuffer#remaining remaining}()];<br> |
| * </tt><i>bBuffer</i><tt>.{@link java.nio.ByteBuffer#get(byte[]) |
| * get}(temp);<br> |
| * return {@link #defineClass(String, byte[], int, int, ProtectionDomain) |
| * </tt><i>cl</i><tt>.defineClass}(</tt><i>name</i><tt>, temp, 0, |
| * temp.length, </tt><i>pd</i><tt>);<br> |
| * </tt></blockquote> |
| * |
| * @param name |
| * The expected <a href="#name">binary name</a>. of the class, or |
| * <tt>null</tt> if not known |
| * |
| * @param b |
| * The bytes that make up the class data. The bytes from positions |
| * <tt>b.position()</tt> through <tt>b.position() + b.limit() -1 |
| * </tt> should have the format of a valid class file as defined by |
| * <cite>The Java™ Virtual Machine Specification</cite>. |
| * |
| * @param protectionDomain |
| * The ProtectionDomain of the class, or <tt>null</tt>. |
| * |
| * @return The <tt>Class</tt> object created from the data, |
| * and optional <tt>ProtectionDomain</tt>. |
| * |
| * @throws ClassFormatError |
| * If the data did not contain a valid class. |
| * |
| * @throws NoClassDefFoundError |
| * If <tt>name</tt> is not equal to the <a href="#name">binary |
| * name</a> of the class specified by <tt>b</tt> |
| * |
| * @throws SecurityException |
| * If an attempt is made to add this class to a package that |
| * contains classes that were signed by a different set of |
| * certificates than this class, or if <tt>name</tt> begins with |
| * "<tt>java.</tt>". |
| * |
| * @see #defineClass(String, byte[], int, int, ProtectionDomain) |
| * |
| * @since 1.5 |
| */ |
| protected final Class<?> defineClass(String name, java.nio.ByteBuffer b, |
| ProtectionDomain protectionDomain) |
| throws ClassFormatError |
| { |
| int len = b.remaining(); |
| |
| // Use byte[] if not a direct ByteBufer: |
| if (!b.isDirect()) { |
| if (b.hasArray()) { |
| return defineClass(name, b.array(), |
| b.position() + b.arrayOffset(), len, |
| protectionDomain); |
| } else { |
| // no array, or read-only array |
| byte[] tb = new byte[len]; |
| b.get(tb); // get bytes out of byte buffer. |
| return defineClass(name, tb, 0, len, protectionDomain); |
| } |
| } |
| |
| protectionDomain = preDefineClass(name, protectionDomain); |
| |
| Class c = null; |
| String source = defineClassSourceLocation(protectionDomain); |
| |
| try { |
| c = defineClass2(name, b, b.position(), len, protectionDomain, |
| source); |
| } catch (ClassFormatError cfe) { |
| byte[] tb = new byte[len]; |
| b.get(tb); // get bytes out of byte buffer. |
| c = defineTransformedClass(name, tb, 0, len, protectionDomain, cfe, |
| source); |
| } |
| |
| postDefineClass(c, protectionDomain); |
| return c; |
| } |
| |
| private native Class defineClass0(String name, byte[] b, int off, int len, |
| ProtectionDomain pd); |
| |
| private native Class defineClass1(String name, byte[] b, int off, int len, |
| ProtectionDomain pd, String source); |
| |
| private native Class defineClass2(String name, java.nio.ByteBuffer b, |
| int off, int len, ProtectionDomain pd, |
| String source); |
| |
| // true if the name is null or has the potential to be a valid binary name |
| private boolean checkName(String name) { |
| if ((name == null) || (name.length() == 0)) |
| return true; |
| if ((name.indexOf('/') != -1) |
| || (!VM.allowArraySyntax() && (name.charAt(0) == '['))) |
| return false; |
| return true; |
| } |
| |
| private void checkCerts(String name, CodeSource cs) { |
| int i = name.lastIndexOf('.'); |
| String pname = (i == -1) ? "" : name.substring(0, i); |
| |
| Certificate[] certs = null; |
| if (cs != null) { |
| certs = cs.getCertificates(); |
| } |
| Certificate[] pcerts = null; |
| if (parallelLockMap == null) { |
| synchronized (this) { |
| pcerts = package2certs.get(pname); |
| if (pcerts == null) { |
| package2certs.put(pname, (certs == null? nocerts:certs)); |
| } |
| } |
| } else { |
| pcerts = ((ConcurrentHashMap<String, Certificate[]>)package2certs). |
| putIfAbsent(pname, (certs == null? nocerts:certs)); |
| } |
| if (pcerts != null && !compareCerts(pcerts, certs)) { |
| throw new SecurityException("class \""+ name + |
| "\"'s signer information does not match signer information of other classes in the same package"); |
| } |
| } |
| |
| /** |
| * check to make sure the certs for the new class (certs) are the same as |
| * the certs for the first class inserted in the package (pcerts) |
| */ |
| private boolean compareCerts(Certificate[] pcerts, |
| Certificate[] certs) |
| { |
| // certs can be null, indicating no certs. |
| if ((certs == null) || (certs.length == 0)) { |
| return pcerts.length == 0; |
| } |
| |
| // the length must be the same at this point |
| if (certs.length != pcerts.length) |
| return false; |
| |
| // go through and make sure all the certs in one array |
| // are in the other and vice-versa. |
| boolean match; |
| for (int i = 0; i < certs.length; i++) { |
| match = false; |
| for (int j = 0; j < pcerts.length; j++) { |
| if (certs[i].equals(pcerts[j])) { |
| match = true; |
| break; |
| } |
| } |
| if (!match) return false; |
| } |
| |
| // now do the same for pcerts |
| for (int i = 0; i < pcerts.length; i++) { |
| match = false; |
| for (int j = 0; j < certs.length; j++) { |
| if (pcerts[i].equals(certs[j])) { |
| match = true; |
| break; |
| } |
| } |
| if (!match) return false; |
| } |
| |
| return true; |
| } |
| |
| /** |
| * Links the specified class. This (misleadingly named) method may be |
| * used by a class loader to link a class. If the class <tt>c</tt> has |
| * already been linked, then this method simply returns. Otherwise, the |
| * class is linked as described in the "Execution" chapter of |
| * <cite>The Java™ Language Specification</cite>. |
| * </p> |
| * |
| * @param c |
| * The class to link |
| * |
| * @throws NullPointerException |
| * If <tt>c</tt> is <tt>null</tt>. |
| * |
| * @see #defineClass(String, byte[], int, int) |
| */ |
| protected final void resolveClass(Class<?> c) { |
| resolveClass0(c); |
| } |
| |
| private native void resolveClass0(Class c); |
| |
| /** |
| * Finds a class with the specified <a href="#name">binary name</a>, |
| * loading it if necessary. |
| * |
| * <p> This method loads the class through the system class loader (see |
| * {@link #getSystemClassLoader()}). The <tt>Class</tt> object returned |
| * might have more than one <tt>ClassLoader</tt> associated with it. |
| * Subclasses of <tt>ClassLoader</tt> need not usually invoke this method, |
| * because most class loaders need to override just {@link |
| * #findClass(String)}. </p> |
| * |
| * @param name |
| * The <a href="#name">binary name</a> of the class |
| * |
| * @return The <tt>Class</tt> object for the specified <tt>name</tt> |
| * |
| * @throws ClassNotFoundException |
| * If the class could not be found |
| * |
| * @see #ClassLoader(ClassLoader) |
| * @see #getParent() |
| */ |
| protected final Class<?> findSystemClass(String name) |
| throws ClassNotFoundException |
| { |
| ClassLoader system = getSystemClassLoader(); |
| if (system == null) { |
| if (!checkName(name)) |
| throw new ClassNotFoundException(name); |
| Class cls = findBootstrapClass(name); |
| if (cls == null) { |
| throw new ClassNotFoundException(name); |
| } |
| return cls; |
| } |
| return system.loadClass(name); |
| } |
| |
| /** |
| * Returns a class loaded by the bootstrap class loader; |
| * or return null if not found. |
| */ |
| private Class findBootstrapClassOrNull(String name) |
| { |
| if (!checkName(name)) return null; |
| |
| return findBootstrapClass(name); |
| } |
| |
| // return null if not found |
| private native Class findBootstrapClass(String name); |
| |
| /** |
| * Returns the class with the given <a href="#name">binary name</a> if this |
| * loader has been recorded by the Java virtual machine as an initiating |
| * loader of a class with that <a href="#name">binary name</a>. Otherwise |
| * <tt>null</tt> is returned. </p> |
| * |
| * @param name |
| * The <a href="#name">binary name</a> of the class |
| * |
| * @return The <tt>Class</tt> object, or <tt>null</tt> if the class has |
| * not been loaded |
| * |
| * @since 1.1 |
| */ |
| protected final Class<?> findLoadedClass(String name) { |
| if (!checkName(name)) |
| return null; |
| return findLoadedClass0(name); |
| } |
| |
| private native final Class findLoadedClass0(String name); |
| |
| /** |
| * Sets the signers of a class. This should be invoked after defining a |
| * class. </p> |
| * |
| * @param c |
| * The <tt>Class</tt> object |
| * |
| * @param signers |
| * The signers for the class |
| * |
| * @since 1.1 |
| */ |
| protected final void setSigners(Class<?> c, Object[] signers) { |
| c.setSigners(signers); |
| } |
| |
| |
| // -- Resource -- |
| |
| /** |
| * Finds the resource with the given name. A resource is some data |
| * (images, audio, text, etc) that can be accessed by class code in a way |
| * that is independent of the location of the code. |
| * |
| * <p> The name of a resource is a '<tt>/</tt>'-separated path name that |
| * identifies the resource. |
| * |
| * <p> This method will first search the parent class loader for the |
| * resource; if the parent is <tt>null</tt> the path of the class loader |
| * built-in to the virtual machine is searched. That failing, this method |
| * will invoke {@link #findResource(String)} to find the resource. </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return A <tt>URL</tt> object for reading the resource, or |
| * <tt>null</tt> if the resource could not be found or the invoker |
| * doesn't have adequate privileges to get the resource. |
| * |
| * @since 1.1 |
| */ |
| public URL getResource(String name) { |
| URL url; |
| if (parent != null) { |
| url = parent.getResource(name); |
| } else { |
| url = getBootstrapResource(name); |
| } |
| if (url == null) { |
| url = findResource(name); |
| } |
| return url; |
| } |
| |
| /** |
| * Finds all the resources with the given name. A resource is some data |
| * (images, audio, text, etc) that can be accessed by class code in a way |
| * that is independent of the location of the code. |
| * |
| * <p>The name of a resource is a <tt>/</tt>-separated path name that |
| * identifies the resource. |
| * |
| * <p> The search order is described in the documentation for {@link |
| * #getResource(String)}. </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return An enumeration of {@link java.net.URL <tt>URL</tt>} objects for |
| * the resource. If no resources could be found, the enumeration |
| * will be empty. Resources that the class loader doesn't have |
| * access to will not be in the enumeration. |
| * |
| * @throws IOException |
| * If I/O errors occur |
| * |
| * @see #findResources(String) |
| * |
| * @since 1.2 |
| */ |
| public Enumeration<URL> getResources(String name) throws IOException { |
| Enumeration[] tmp = new Enumeration[2]; |
| if (parent != null) { |
| tmp[0] = parent.getResources(name); |
| } else { |
| tmp[0] = getBootstrapResources(name); |
| } |
| tmp[1] = findResources(name); |
| |
| return new CompoundEnumeration<>(tmp); |
| } |
| |
| /** |
| * Finds the resource with the given name. Class loader implementations |
| * should override this method to specify where to find resources. </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return A <tt>URL</tt> object for reading the resource, or |
| * <tt>null</tt> if the resource could not be found |
| * |
| * @since 1.2 |
| */ |
| protected URL findResource(String name) { |
| return null; |
| } |
| |
| /** |
| * Returns an enumeration of {@link java.net.URL <tt>URL</tt>} objects |
| * representing all the resources with the given name. Class loader |
| * implementations should override this method to specify where to load |
| * resources from. </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return An enumeration of {@link java.net.URL <tt>URL</tt>} objects for |
| * the resources |
| * |
| * @throws IOException |
| * If I/O errors occur |
| * |
| * @since 1.2 |
| */ |
| protected Enumeration<URL> findResources(String name) throws IOException { |
| return java.util.Collections.emptyEnumeration(); |
| } |
| |
| /** |
| * Registers the caller as parallel capable.</p> |
| * The registration succeeds if and only if all of the following |
| * conditions are met: <br> |
| * 1. no instance of the caller has been created</p> |
| * 2. all of the super classes (except class Object) of the caller are |
| * registered as parallel capable</p> |
| * Note that once a class loader is registered as parallel capable, there |
| * is no way to change it back. </p> |
| * |
| * @return true if the caller is successfully registered as |
| * parallel capable and false if otherwise. |
| * |
| * @since 1.7 |
| */ |
| @CallerSensitive |
| protected static boolean registerAsParallelCapable() { |
| Class<? extends ClassLoader> callerClass = |
| Reflection.getCallerClass().asSubclass(ClassLoader.class); |
| return ParallelLoaders.register(callerClass); |
| } |
| |
| /** |
| * Find a resource of the specified name from the search path used to load |
| * classes. This method locates the resource through the system class |
| * loader (see {@link #getSystemClassLoader()}). </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return A {@link java.net.URL <tt>URL</tt>} object for reading the |
| * resource, or <tt>null</tt> if the resource could not be found |
| * |
| * @since 1.1 |
| */ |
| public static URL getSystemResource(String name) { |
| ClassLoader system = getSystemClassLoader(); |
| if (system == null) { |
| return getBootstrapResource(name); |
| } |
| return system.getResource(name); |
| } |
| |
| /** |
| * Finds all resources of the specified name from the search path used to |
| * load classes. The resources thus found are returned as an |
| * {@link java.util.Enumeration <tt>Enumeration</tt>} of {@link |
| * java.net.URL <tt>URL</tt>} objects. |
| * |
| * <p> The search order is described in the documentation for {@link |
| * #getSystemResource(String)}. </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return An enumeration of resource {@link java.net.URL <tt>URL</tt>} |
| * objects |
| * |
| * @throws IOException |
| * If I/O errors occur |
| |
| * @since 1.2 |
| */ |
| public static Enumeration<URL> getSystemResources(String name) |
| throws IOException |
| { |
| ClassLoader system = getSystemClassLoader(); |
| if (system == null) { |
| return getBootstrapResources(name); |
| } |
| return system.getResources(name); |
| } |
| |
| /** |
| * Find resources from the VM's built-in classloader. |
| */ |
| private static URL getBootstrapResource(String name) { |
| URLClassPath ucp = getBootstrapClassPath(); |
| Resource res = ucp.getResource(name); |
| return res != null ? res.getURL() : null; |
| } |
| |
| /** |
| * Find resources from the VM's built-in classloader. |
| */ |
| private static Enumeration<URL> getBootstrapResources(String name) |
| throws IOException |
| { |
| final Enumeration<Resource> e = |
| getBootstrapClassPath().getResources(name); |
| return new Enumeration<URL> () { |
| public URL nextElement() { |
| return e.nextElement().getURL(); |
| } |
| public boolean hasMoreElements() { |
| return e.hasMoreElements(); |
| } |
| }; |
| } |
| |
| // Returns the URLClassPath that is used for finding system resources. |
| static URLClassPath getBootstrapClassPath() { |
| return sun.misc.Launcher.getBootstrapClassPath(); |
| } |
| |
| |
| /** |
| * Returns an input stream for reading the specified resource. |
| * |
| * <p> The search order is described in the documentation for {@link |
| * #getResource(String)}. </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return An input stream for reading the resource, or <tt>null</tt> |
| * if the resource could not be found |
| * |
| * @since 1.1 |
| */ |
| public InputStream getResourceAsStream(String name) { |
| URL url = getResource(name); |
| try { |
| return url != null ? url.openStream() : null; |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| /** |
| * Open for reading, a resource of the specified name from the search path |
| * used to load classes. This method locates the resource through the |
| * system class loader (see {@link #getSystemClassLoader()}). </p> |
| * |
| * @param name |
| * The resource name |
| * |
| * @return An input stream for reading the resource, or <tt>null</tt> |
| * if the resource could not be found |
| * |
| * @since 1.1 |
| */ |
| public static InputStream getSystemResourceAsStream(String name) { |
| URL url = getSystemResource(name); |
| try { |
| return url != null ? url.openStream() : null; |
| } catch (IOException e) { |
| return null; |
| } |
| } |
| |
| |
| // -- Hierarchy -- |
| |
| /** |
| * Returns the parent class loader for delegation. Some implementations may |
| * use <tt>null</tt> to represent the bootstrap class loader. This method |
| * will return <tt>null</tt> in such implementations if this class loader's |
| * parent is the bootstrap class loader. |
| * |
| * <p> If a security manager is present, and the invoker's class loader is |
| * not <tt>null</tt> and is not an ancestor of this class loader, then this |
| * method invokes the security manager's {@link |
| * SecurityManager#checkPermission(java.security.Permission) |
| * <tt>checkPermission</tt>} method with a {@link |
| * RuntimePermission#RuntimePermission(String) |
| * <tt>RuntimePermission("getClassLoader")</tt>} permission to verify |
| * access to the parent class loader is permitted. If not, a |
| * <tt>SecurityException</tt> will be thrown. </p> |
| * |
| * @return The parent <tt>ClassLoader</tt> |
| * |
| * @throws SecurityException |
| * If a security manager exists and its <tt>checkPermission</tt> |
| * method doesn't allow access to this class loader's parent class |
| * loader. |
| * |
| * @since 1.2 |
| */ |
| @CallerSensitive |
| public final ClassLoader getParent() { |
| if (parent == null) |
| return null; |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| checkClassLoaderPermission(parent, Reflection.getCallerClass()); |
| } |
| return parent; |
| } |
| |
| /** |
| * Returns the system class loader for delegation. This is the default |
| * delegation parent for new <tt>ClassLoader</tt> instances, and is |
| * typically the class loader used to start the application. |
| * |
| * <p> This method is first invoked early in the runtime's startup |
| * sequence, at which point it creates the system class loader and sets it |
| * as the context class loader of the invoking <tt>Thread</tt>. |
| * |
| * <p> The default system class loader is an implementation-dependent |
| * instance of this class. |
| * |
| * <p> If the system property "<tt>java.system.class.loader</tt>" is defined |
| * when this method is first invoked then the value of that property is |
| * taken to be the name of a class that will be returned as the system |
| * class loader. The class is loaded using the default system class loader |
| * and must define a public constructor that takes a single parameter of |
| * type <tt>ClassLoader</tt> which is used as the delegation parent. An |
| * instance is then created using this constructor with the default system |
| * class loader as the parameter. The resulting class loader is defined |
| * to be the system class loader. |
| * |
| * <p> If a security manager is present, and the invoker's class loader is |
| * not <tt>null</tt> and the invoker's class loader is not the same as or |
| * an ancestor of the system class loader, then this method invokes the |
| * security manager's {@link |
| * SecurityManager#checkPermission(java.security.Permission) |
| * <tt>checkPermission</tt>} method with a {@link |
| * RuntimePermission#RuntimePermission(String) |
| * <tt>RuntimePermission("getClassLoader")</tt>} permission to verify |
| * access to the system class loader. If not, a |
| * <tt>SecurityException</tt> will be thrown. </p> |
| * |
| * @return The system <tt>ClassLoader</tt> for delegation, or |
| * <tt>null</tt> if none |
| * |
| * @throws SecurityException |
| * If a security manager exists and its <tt>checkPermission</tt> |
| * method doesn't allow access to the system class loader. |
| * |
| * @throws IllegalStateException |
| * If invoked recursively during the construction of the class |
| * loader specified by the "<tt>java.system.class.loader</tt>" |
| * property. |
| * |
| * @throws Error |
| * If the system property "<tt>java.system.class.loader</tt>" |
| * is defined but the named class could not be loaded, the |
| * provider class does not define the required constructor, or an |
| * exception is thrown by that constructor when it is invoked. The |
| * underlying cause of the error can be retrieved via the |
| * {@link Throwable#getCause()} method. |
| * |
| * @revised 1.4 |
| */ |
| @CallerSensitive |
| public static ClassLoader getSystemClassLoader() { |
| initSystemClassLoader(); |
| if (scl == null) { |
| return null; |
| } |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| checkClassLoaderPermission(scl, Reflection.getCallerClass()); |
| } |
| return scl; |
| } |
| |
| private static synchronized void initSystemClassLoader() { |
| if (!sclSet) { |
| if (scl != null) |
| throw new IllegalStateException("recursive invocation"); |
| sun.misc.Launcher l = sun.misc.Launcher.getLauncher(); |
| if (l != null) { |
| Throwable oops = null; |
| scl = l.getClassLoader(); |
| try { |
| scl = AccessController.doPrivileged( |
| new SystemClassLoaderAction(scl)); |
| } catch (PrivilegedActionException pae) { |
| oops = pae.getCause(); |
| if (oops instanceof InvocationTargetException) { |
| oops = oops.getCause(); |
| } |
| } |
| if (oops != null) { |
| if (oops instanceof Error) { |
| throw (Error) oops; |
| } else { |
| // wrap the exception |
| throw new Error(oops); |
| } |
| } |
| } |
| sclSet = true; |
| } |
| } |
| |
| // Returns true if the specified class loader can be found in this class |
| // loader's delegation chain. |
| boolean isAncestor(ClassLoader cl) { |
| ClassLoader acl = this; |
| do { |
| acl = acl.parent; |
| if (cl == acl) { |
| return true; |
| } |
| } while (acl != null); |
| return false; |
| } |
| |
| // Tests if class loader access requires "getClassLoader" permission |
| // check. A class loader 'from' can access class loader 'to' if |
| // class loader 'from' is same as class loader 'to' or an ancestor |
| // of 'to'. The class loader in a system domain can access |
| // any class loader. |
| private static boolean needsClassLoaderPermissionCheck(ClassLoader from, |
| ClassLoader to) |
| { |
| if (from == to) |
| return false; |
| |
| if (from == null) |
| return false; |
| |
| return !to.isAncestor(from); |
| } |
| |
| // Returns the class's class loader, or null if none. |
| static ClassLoader getClassLoader(Class<?> caller) { |
| // This can be null if the VM is requesting it |
| if (caller == null) { |
| return null; |
| } |
| // Circumvent security check since this is package-private |
| return caller.getClassLoader0(); |
| } |
| |
| static void checkClassLoaderPermission(ClassLoader cl, Class<?> caller) { |
| SecurityManager sm = System.getSecurityManager(); |
| if (sm != null) { |
| // caller can be null if the VM is requesting it |
| ClassLoader ccl = getClassLoader(caller); |
| if (needsClassLoaderPermissionCheck(ccl, cl)) { |
| sm.checkPermission(SecurityConstants.GET_CLASSLOADER_PERMISSION); |
| } |
| } |
| } |
| |
| // The class loader for the system |
| // @GuardedBy("ClassLoader.class") |
| private static ClassLoader scl; |
| |
| // Set to true once the system class loader has been set |
| // @GuardedBy("ClassLoader.class") |
| private static boolean sclSet; |
| |
| |
| // -- Package -- |
| |
| /** |
| * Defines a package by name in this <tt>ClassLoader</tt>. This allows |
| * class loaders to define the packages for their classes. Packages must |
| * be created before the class is defined, and package names must be |
| * unique within a class loader and cannot be redefined or changed once |
| * created. </p> |
| * |
| * @param name |
| * The package name |
| * |
| * @param specTitle |
| * The specification title |
| * |
| * @param specVersion |
| * The specification version |
| * |
| * @param specVendor |
| * The specification vendor |
| * |
| * @param implTitle |
| * The implementation title |
| * |
| * @param implVersion |
| * The implementation version |
| * |
| * @param implVendor |
| * The implementation vendor |
| * |
| * @param sealBase |
| * If not <tt>null</tt>, then this package is sealed with |
| * respect to the given code source {@link java.net.URL |
| * <tt>URL</tt>} object. Otherwise, the package is not sealed. |
| * |
| * @return The newly defined <tt>Package</tt> object |
| * |
| * @throws IllegalArgumentException |
| * If package name duplicates an existing package either in this |
| * class loader or one of its ancestors |
| * |
| * @since 1.2 |
| */ |
| protected Package definePackage(String name, String specTitle, |
| String specVersion, String specVendor, |
| String implTitle, String implVersion, |
| String implVendor, URL sealBase) |
| throws IllegalArgumentException |
| { |
| synchronized (packages) { |
| Package pkg = getPackage(name); |
| if (pkg != null) { |
| throw new IllegalArgumentException(name); |
| } |
| pkg = new Package(name, specTitle, specVersion, specVendor, |
| implTitle, implVersion, implVendor, |
| sealBase, this); |
| packages.put(name, pkg); |
| return pkg; |
| } |
| } |
| |
| /** |
| * Returns a <tt>Package</tt> that has been defined by this class loader |
| * or any of its ancestors. </p> |
| * |
| * @param name |
| * The package name |
| * |
| * @return The <tt>Package</tt> corresponding to the given name, or |
| * <tt>null</tt> if not found |
| * |
| * @since 1.2 |
| */ |
| protected Package getPackage(String name) { |
| Package pkg; |
| synchronized (packages) { |
| pkg = packages.get(name); |
| } |
| if (pkg == null) { |
| if (parent != null) { |
| pkg = parent.getPackage(name); |
| } else { |
| pkg = Package.getSystemPackage(name); |
| } |
| if (pkg != null) { |
| synchronized (packages) { |
| Package pkg2 = packages.get(name); |
| if (pkg2 == null) { |
| packages.put(name, pkg); |
| } else { |
| pkg = pkg2; |
| } |
| } |
| } |
| } |
| return pkg; |
| } |
| |
| /** |
| * Returns all of the <tt>Packages</tt> defined by this class loader and |
| * its ancestors. </p> |
| * |
| * @return The array of <tt>Package</tt> objects defined by this |
| * <tt>ClassLoader</tt> |
| * |
| * @since 1.2 |
| */ |
| protected Package[] getPackages() { |
| Map<String, Package> map; |
| synchronized (packages) { |
| map = new HashMap<>(packages); |
| } |
| Package[] pkgs; |
| if (parent != null) { |
| pkgs = parent.getPackages(); |
| } else { |
| pkgs = Package.getSystemPackages(); |
| } |
| if (pkgs != null) { |
| for (int i = 0; i < pkgs.length; i++) { |
| String pkgName = pkgs[i].getName(); |
| if (map.get(pkgName) == null) { |
| map.put(pkgName, pkgs[i]); |
| } |
| } |
| } |
| return map.values().toArray(new Package[map.size()]); |
| } |
| |
| |
| // -- Native library access -- |
| |
| /** |
| * Returns the absolute path name of a native library. The VM invokes this |
| * method to locate the native libraries that belong to classes loaded with |
| * this class loader. If this method returns <tt>null</tt>, the VM |
| * searches the library along the path specified as the |
| * "<tt>java.library.path</tt>" property. </p> |
| * |
| * @param libname |
| * The library name |
| * |
| * @return The absolute path of the native library |
| * |
| * @see System#loadLibrary(String) |
| * @see System#mapLibraryName(String) |
| * |
| * @since 1.2 |
| */ |
| protected String findLibrary(String libname) { |
| return null; |
| } |
| |
| /** |
| * The inner class NativeLibrary denotes a loaded native library instance. |
| * Every classloader contains a vector of loaded native libraries in the |
| * private field <tt>nativeLibraries</tt>. The native libraries loaded |
| * into the system are entered into the <tt>systemNativeLibraries</tt> |
| * vector. |
| * |
| * <p> Every native library requires a particular version of JNI. This is |
| * denoted by the private <tt>jniVersion</tt> field. This field is set by |
| * the VM when it loads the library, and used by the VM to pass the correct |
| * version of JNI to the native methods. </p> |
| * |
| * @see ClassLoader |
| * @since 1.2 |
| */ |
| static class NativeLibrary { |
| // opaque handle to native library, used in native code. |
| long handle; |
| // the version of JNI environment the native library requires. |
| private int jniVersion; |
| // the class from which the library is loaded, also indicates |
| // the loader this native library belongs. |
| private Class fromClass; |
| // the canonicalized name of the native library. |
| String name; |
| |
| native void load(String name); |
| native long find(String name); |
| native void unload(); |
| |
| public NativeLibrary(Class fromClass, String name) { |
| this.name = name; |
| this.fromClass = fromClass; |
| } |
| |
| protected void finalize() { |
| synchronized (loadedLibraryNames) { |
| if (fromClass.getClassLoader() != null && handle != 0) { |
| /* remove the native library name */ |
| int size = loadedLibraryNames.size(); |
| for (int i = 0; i < size; i++) { |
| if (name.equals(loadedLibraryNames.elementAt(i))) { |
| loadedLibraryNames.removeElementAt(i); |
| break; |
| } |
| } |
| /* unload the library. */ |
| ClassLoader.nativeLibraryContext.push(this); |
| try { |
| unload(); |
| } finally { |
| ClassLoader.nativeLibraryContext.pop(); |
| } |
| } |
| } |
| } |
| // Invoked in the VM to determine the context class in |
| // JNI_Load/JNI_Unload |
| static Class getFromClass() { |
| return ClassLoader.nativeLibraryContext.peek().fromClass; |
| } |
| } |
| |
| // All native library names we've loaded. |
| private static Vector<String> loadedLibraryNames = new Vector<>(); |
| |
| // Native libraries belonging to system classes. |
| private static Vector<NativeLibrary> systemNativeLibraries |
| = new Vector<>(); |
| |
| // Native libraries associated with the class loader. |
| private Vector<NativeLibrary> nativeLibraries = new Vector<>(); |
| |
| // native libraries being loaded/unloaded. |
| private static Stack<NativeLibrary> nativeLibraryContext = new Stack<>(); |
| |
| // The paths searched for libraries |
| private static String usr_paths[]; |
| private static String sys_paths[]; |
| |
| private static String[] initializePath(String propname) { |
| String ldpath = System.getProperty(propname, ""); |
| String ps = File.pathSeparator; |
| int ldlen = ldpath.length(); |
| int i, j, n; |
| // Count the separators in the path |
| i = ldpath.indexOf(ps); |
| n = 0; |
| while (i >= 0) { |
| n++; |
| i = ldpath.indexOf(ps, i + 1); |
| } |
| |
| // allocate the array of paths - n :'s = n + 1 path elements |
| String[] paths = new String[n + 1]; |
| |
| // Fill the array with paths from the ldpath |
| n = i = 0; |
| j = ldpath.indexOf(ps); |
| while (j >= 0) { |
| if (j - i > 0) { |
| paths[n++] = ldpath.substring(i, j); |
| } else if (j - i == 0) { |
| paths[n++] = "."; |
| } |
| i = j + 1; |
| j = ldpath.indexOf(ps, i); |
| } |
| paths[n] = ldpath.substring(i, ldlen); |
| return paths; |
| } |
| |
| // Invoked in the java.lang.Runtime class to implement load and loadLibrary. |
| static void loadLibrary(Class fromClass, String name, |
| boolean isAbsolute) { |
| ClassLoader loader = |
| (fromClass == null) ? null : fromClass.getClassLoader(); |
| if (sys_paths == null) { |
| usr_paths = initializePath("java.library.path"); |
| sys_paths = initializePath("sun.boot.library.path"); |
| } |
| if (isAbsolute) { |
| if (loadLibrary0(fromClass, new File(name))) { |
| return; |
| } |
| throw new UnsatisfiedLinkError("Can't load library: " + name); |
| } |
| if (loader != null) { |
| String libfilename = loader.findLibrary(name); |
| if (libfilename != null) { |
| File libfile = new File(libfilename); |
| if (!libfile.isAbsolute()) { |
| throw new UnsatisfiedLinkError( |
| "ClassLoader.findLibrary failed to return an absolute path: " + libfilename); |
| } |
| if (loadLibrary0(fromClass, libfile)) { |
| return; |
| } |
| throw new UnsatisfiedLinkError("Can't load " + libfilename); |
| } |
| } |
| for (int i = 0 ; i < sys_paths.length ; i++) { |
| File libfile = new File(sys_paths[i], System.mapLibraryName(name)); |
| if (loadLibrary0(fromClass, libfile)) { |
| return; |
| } |
| } |
| if (loader != null) { |
| for (int i = 0 ; i < usr_paths.length ; i++) { |
| File libfile = new File(usr_paths[i], |
| System.mapLibraryName(name)); |
| if (loadLibrary0(fromClass, libfile)) { |
| return; |
| } |
| } |
| } |
| // Oops, it failed |
| throw new UnsatisfiedLinkError("no " + name + " in java.library.path"); |
| } |
| |
| private static boolean loadLibrary0(Class fromClass, final File file) { |
| if (loadLibrary1(fromClass, file)) { |
| return true; |
| } |
| final File libfile = ClassLoaderHelper.mapAlternativeName(file); |
| if (libfile != null && loadLibrary1(fromClass, libfile)) { |
| return true; |
| } |
| return false; |
| } |
| |
| private static boolean loadLibrary1(Class fromClass, final File file) { |
| boolean exists = AccessController.doPrivileged( |
| new PrivilegedAction<Object>() { |
| public Object run() { |
| return file.exists() ? Boolean.TRUE : null; |
| }}) |
| != null; |
| if (!exists) { |
| return false; |
| } |
| String name; |
| try { |
| name = file.getCanonicalPath(); |
| } catch (IOException e) { |
| return false; |
| } |
| ClassLoader loader = |
| (fromClass == null) ? null : fromClass.getClassLoader(); |
| Vector<NativeLibrary> libs = |
| loader != null ? loader.nativeLibraries : systemNativeLibraries; |
| synchronized (libs) { |
| int size = libs.size(); |
| for (int i = 0; i < size; i++) { |
| NativeLibrary lib = libs.elementAt(i); |
| if (name.equals(lib.name)) { |
| return true; |
| } |
| } |
| |
| synchronized (loadedLibraryNames) { |
| if (loadedLibraryNames.contains(name)) { |
| throw new UnsatisfiedLinkError |
| ("Native Library " + |
| name + |
| " already loaded in another classloader"); |
| } |
| /* If the library is being loaded (must be by the same thread, |
| * because Runtime.load and Runtime.loadLibrary are |
| * synchronous). The reason is can occur is that the JNI_OnLoad |
| * function can cause another loadLibrary invocation. |
| * |
| * Thus we can use a static stack to hold the list of libraries |
| * we are loading. |
| * |
| * If there is a pending load operation for the library, we |
| * immediately return success; otherwise, we raise |
| * UnsatisfiedLinkError. |
| */ |
| int n = nativeLibraryContext.size(); |
| for (int i = 0; i < n; i++) { |
| NativeLibrary lib = nativeLibraryContext.elementAt(i); |
| if (name.equals(lib.name)) { |
| if (loader == lib.fromClass.getClassLoader()) { |
| return true; |
| } else { |
| throw new UnsatisfiedLinkError |
| ("Native Library " + |
| name + |
| " is being loaded in another classloader"); |
| } |
| } |
| } |
| NativeLibrary lib = new NativeLibrary(fromClass, name); |
| nativeLibraryContext.push(lib); |
| try { |
| lib.load(name); |
| } finally { |
| nativeLibraryContext.pop(); |
| } |
| if (lib.handle != 0) { |
| loadedLibraryNames.addElement(name); |
| libs.addElement(lib); |
| return true; |
| } |
| return false; |
| } |
| } |
| } |
| |
| // Invoked in the VM class linking code. |
| static long findNative(ClassLoader loader, String name) { |
| Vector<NativeLibrary> libs = |
| loader != null ? loader.nativeLibraries : systemNativeLibraries; |
| synchronized (libs) { |
| int size = libs.size(); |
| for (int i = 0; i < size; i++) { |
| NativeLibrary lib = libs.elementAt(i); |
| long entry = lib.find(name); |
| if (entry != 0) |
| return entry; |
| } |
| } |
| return 0; |
| } |
| |
| |
| // -- Assertion management -- |
| |
| final Object assertionLock; |
| |
| // The default toggle for assertion checking. |
| // @GuardedBy("assertionLock") |
| private boolean defaultAssertionStatus = false; |
| |
| // Maps String packageName to Boolean package default assertion status Note |
| // that the default package is placed under a null map key. If this field |
| // is null then we are delegating assertion status queries to the VM, i.e., |
| // none of this ClassLoader's assertion status modification methods have |
| // been invoked. |
| // @GuardedBy("assertionLock") |
| private Map<String, Boolean> packageAssertionStatus = null; |
| |
| // Maps String fullyQualifiedClassName to Boolean assertionStatus If this |
| // field is null then we are delegating assertion status queries to the VM, |
| // i.e., none of this ClassLoader's assertion status modification methods |
| // have been invoked. |
| // @GuardedBy("assertionLock") |
| Map<String, Boolean> classAssertionStatus = null; |
| |
| /** |
| * Sets the default assertion status for this class loader. This setting |
| * determines whether classes loaded by this class loader and initialized |
| * in the future will have assertions enabled or disabled by default. |
| * This setting may be overridden on a per-package or per-class basis by |
| * invoking {@link #setPackageAssertionStatus(String, boolean)} or {@link |
| * #setClassAssertionStatus(String, boolean)}. </p> |
| * |
| * @param enabled |
| * <tt>true</tt> if classes loaded by this class loader will |
| * henceforth have assertions enabled by default, <tt>false</tt> |
| * if they will have assertions disabled by default. |
| * |
| * @since 1.4 |
| */ |
| public void setDefaultAssertionStatus(boolean enabled) { |
| synchronized (assertionLock) { |
| if (classAssertionStatus == null) |
| initializeJavaAssertionMaps(); |
| |
| defaultAssertionStatus = enabled; |
| } |
| } |
| |
| /** |
| * Sets the package default assertion status for the named package. The |
| * package default assertion status determines the assertion status for |
| * classes initialized in the future that belong to the named package or |
| * any of its "subpackages". |
| * |
| * <p> A subpackage of a package named p is any package whose name begins |
| * with "<tt>p.</tt>". For example, <tt>javax.swing.text</tt> is a |
| * subpackage of <tt>javax.swing</tt>, and both <tt>java.util</tt> and |
| * <tt>java.lang.reflect</tt> are subpackages of <tt>java</tt>. |
| * |
| * <p> In the event that multiple package defaults apply to a given class, |
| * the package default pertaining to the most specific package takes |
| * precedence over the others. For example, if <tt>javax.lang</tt> and |
| * <tt>javax.lang.reflect</tt> both have package defaults associated with |
| * them, the latter package default applies to classes in |
| * <tt>javax.lang.reflect</tt>. |
| * |
| * <p> Package defaults take precedence over the class loader's default |
| * assertion status, and may be overridden on a per-class basis by invoking |
| * {@link #setClassAssertionStatus(String, boolean)}. </p> |
| * |
| * @param packageName |
| * The name of the package whose package default assertion status |
| * is to be set. A <tt>null</tt> value indicates the unnamed |
| * package that is "current" |
| * (see section 7.4.2 of |
| * <cite>The Java™ Language Specification</cite>.) |
| * |
| * @param enabled |
| * <tt>true</tt> if classes loaded by this classloader and |
| * belonging to the named package or any of its subpackages will |
| * have assertions enabled by default, <tt>false</tt> if they will |
| * have assertions disabled by default. |
| * |
| * @since 1.4 |
| */ |
| public void setPackageAssertionStatus(String packageName, |
| boolean enabled) { |
| synchronized (assertionLock) { |
| if (packageAssertionStatus == null) |
| initializeJavaAssertionMaps(); |
| |
| packageAssertionStatus.put(packageName, enabled); |
| } |
| } |
| |
| /** |
| * Sets the desired assertion status for the named top-level class in this |
| * class loader and any nested classes contained therein. This setting |
| * takes precedence over the class loader's default assertion status, and |
| * over any applicable per-package default. This method has no effect if |
| * the named class has already been initialized. (Once a class is |
| * initialized, its assertion status cannot change.) |
| * |
| * <p> If the named class is not a top-level class, this invocation will |
| * have no effect on the actual assertion status of any class. </p> |
| * |
| * @param className |
| * The fully qualified class name of the top-level class whose |
| * assertion status is to be set. |
| * |
| * @param enabled |
| * <tt>true</tt> if the named class is to have assertions |
| * enabled when (and if) it is initialized, <tt>false</tt> if the |
| * class is to have assertions disabled. |
| * |
| * @since 1.4 |
| */ |
| public void setClassAssertionStatus(String className, boolean enabled) { |
| synchronized (assertionLock) { |
| if (classAssertionStatus == null) |
| initializeJavaAssertionMaps(); |
| |
| classAssertionStatus.put(className, enabled); |
| } |
| } |
| |
| /** |
| * Sets the default assertion status for this class loader to |
| * <tt>false</tt> and discards any package defaults or class assertion |
| * status settings associated with the class loader. This method is |
| * provided so that class loaders can be made to ignore any command line or |
| * persistent assertion status settings and "start with a clean slate." |
| * </p> |
| * |
| * @since 1.4 |
| */ |
| public void clearAssertionStatus() { |
| /* |
| * Whether or not "Java assertion maps" are initialized, set |
| * them to empty maps, effectively ignoring any present settings. |
| */ |
| synchronized (assertionLock) { |
| classAssertionStatus = new HashMap<>(); |
| packageAssertionStatus = new HashMap<>(); |
| defaultAssertionStatus = false; |
| } |
| } |
| |
| /** |
| * Returns the assertion status that would be assigned to the specified |
| * class if it were to be initialized at the time this method is invoked. |
| * If the named class has had its assertion status set, the most recent |
| * setting will be returned; otherwise, if any package default assertion |
| * status pertains to this class, the most recent setting for the most |
| * specific pertinent package default assertion status is returned; |
| * otherwise, this class loader's default assertion status is returned. |
| * </p> |
| * |
| * @param className |
| * The fully qualified class name of the class whose desired |
| * assertion status is being queried. |
| * |
| * @return The desired assertion status of the specified class. |
| * |
| * @see #setClassAssertionStatus(String, boolean) |
| * @see #setPackageAssertionStatus(String, boolean) |
| * @see #setDefaultAssertionStatus(boolean) |
| * |
| * @since 1.4 |
| */ |
| boolean desiredAssertionStatus(String className) { |
| synchronized (assertionLock) { |
| // assert classAssertionStatus != null; |
| // assert packageAssertionStatus != null; |
| |
| // Check for a class entry |
| Boolean result = classAssertionStatus.get(className); |
| if (result != null) |
| return result.booleanValue(); |
| |
| // Check for most specific package entry |
| int dotIndex = className.lastIndexOf("."); |
| if (dotIndex < 0) { // default package |
| result = packageAssertionStatus.get(null); |
| if (result != null) |
| return result.booleanValue(); |
| } |
| while(dotIndex > 0) { |
| className = className.substring(0, dotIndex); |
| result = packageAssertionStatus.get(className); |
| if (result != null) |
| return result.booleanValue(); |
| dotIndex = className.lastIndexOf(".", dotIndex-1); |
| } |
| |
| // Return the classloader default |
| return defaultAssertionStatus; |
| } |
| } |
| |
| // Set up the assertions with information provided by the VM. |
| // Note: Should only be called inside a synchronized block |
| private void initializeJavaAssertionMaps() { |
| // assert Thread.holdsLock(assertionLock); |
| |
| classAssertionStatus = new HashMap<>(); |
| packageAssertionStatus = new HashMap<>(); |
| AssertionStatusDirectives directives = retrieveDirectives(); |
| |
| for(int i = 0; i < directives.classes.length; i++) |
| classAssertionStatus.put(directives.classes[i], |
| directives.classEnabled[i]); |
| |
| for(int i = 0; i < directives.packages.length; i++) |
| packageAssertionStatus.put(directives.packages[i], |
| directives.packageEnabled[i]); |
| |
| defaultAssertionStatus = directives.deflt; |
| } |
| |
| // Retrieves the assertion directives from the VM. |
| private static native AssertionStatusDirectives retrieveDirectives(); |
| } |
| |
| |
| class SystemClassLoaderAction |
| implements PrivilegedExceptionAction<ClassLoader> { |
| private ClassLoader parent; |
| |
| SystemClassLoaderAction(ClassLoader parent) { |
| this.parent = parent; |
| } |
| |
| public ClassLoader run() throws Exception { |
| String cls = System.getProperty("java.system.class.loader"); |
| if (cls == null) { |
| return parent; |
| } |
| |
| Constructor ctor = Class.forName(cls, true, parent) |
| .getDeclaredConstructor(new Class[] { ClassLoader.class }); |
| ClassLoader sys = (ClassLoader) ctor.newInstance( |
| new Object[] { parent }); |
| Thread.currentThread().setContextClassLoader(sys); |
| return sys; |
| } |
| } |
