test/hotspot/jtreg/runtime/noClassDefFoundMsg/NoClassDefFoundMsg.java

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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 8056900
 * @summary Verifies message returned with NoClassDefFoundError exception.
 * @library /test/lib
 * @modules java.base/jdk.internal.misc
 *          java.compiler
 * @run main/native NoClassDefFoundMsg
 */

import jdk.test.lib.compiler.InMemoryJavaCompiler;
import jdk.internal.misc.Unsafe;

public class NoClassDefFoundMsg {

    static native void callDefineClass(String className);
    static native void callFindClass(String className);
    static {
        System.loadLibrary("NoClassDefFoundMsg");
    }


    public static void main(String args[]) throws Exception {
        Unsafe unsafe = Unsafe.getUnsafe();

        byte klassbuf[] = InMemoryJavaCompiler.compile("TestClass", "class TestClass { }");

        // Create a class name of length 65536.
        StringBuilder tooBigClassName = new StringBuilder("z");
        for (int x = 0; x < 16; x++) {
            tooBigClassName = tooBigClassName.append(tooBigClassName);
        }

        // Test JVM_DefineClass() with long name.
        try {
            unsafe.defineClass(tooBigClassName.toString(), klassbuf, 4, klassbuf.length - 4, null, null);
            throw new RuntimeException("defineClass did not throw expected NoClassDefFoundError");
        } catch (NoClassDefFoundError e) {
            if (!e.getMessage().contains("Class name exceeds maximum length of ")) {
                throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());
            }
        }

        // Test JNI_DefineClass() with long name.
        try {
            callDefineClass(tooBigClassName.toString());
            throw new RuntimeException("DefineClass did not throw expected NoClassDefFoundError");
        } catch (NoClassDefFoundError e) {
            if (!e.getMessage().contains("Class name exceeds maximum length of ")) {
                throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());
            }
        }

        // Test JNI_FindClass() with long name.
        try {
            callFindClass(tooBigClassName.toString());
            throw new RuntimeException("DefineClass did not throw expected NoClassDefFoundError");
        } catch (NoClassDefFoundError e) {
            if (!e.getMessage().contains("Class name exceeds maximum length of ")) {
                throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());
            }
        }

        // Test JNI_FindClass() with null name.
        try {
            callFindClass(null);
            throw new RuntimeException("FindClass did not throw expected NoClassDefFoundError");
        } catch (NoClassDefFoundError e) {
            if (!e.getMessage().contains("No class name given")) {
                throw new RuntimeException("Wrong NoClassDefFoundError: " + e.getMessage());
            }
        }
    }
}