test/jdk/jdk/internal/reflect/AnonymousNewInstance/ManyNewInstanceAnonTest.java

/*
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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * version 2 for more details (a copy is included in the LICENSE file that
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 * 2 along with this work; if not, write to the Free Software Foundation,
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/*
 * @test
 * @bug 7194897
 * @summary JSR 292: Cannot create more than 16 instances of an anonymous class
 * @modules java.base/jdk.internal.misc
 *          java.management
 * @library /test/lib
 * @author  Robert Field
 * @compile -XDignore.symbol.file ManyNewInstanceAnonTest.java
 * @run main ClassFileInstaller ManyNewInstanceAnonTest
 * @run main/othervm -Xbootclasspath/a:. -Xverify:all ManyNewInstanceAnonTest
 * @run main/othervm -Xbootclasspath/a:. -Xverify:all -Dsun.reflection.noInflation=true ManyNewInstanceAnonTest
 */
import java.io.ByteArrayOutputStream;
import java.io.InputStream;
import jdk.internal.misc.Unsafe;

public class ManyNewInstanceAnonTest {

    static final int REPS = 20;
    static final Class<?> klass = ManyNewInstanceAnonTest.class;

    public static void main(String[] args) throws Exception {
        Class<?> c = Unsafe.getUnsafe().defineAnonymousClass(klass, readClassFile(), null);
        for (int i = 0; i < REPS; ++i) {
            System.out.printf("%d: %s\n", i, c.newInstance());
        }
        System.out.println("Passed.");
    }

    private static byte[] readClassFile() throws Exception {
        try (InputStream in = klass.getResourceAsStream(klass.getSimpleName() + ".class");
             ByteArrayOutputStream out = new ByteArrayOutputStream())
        {
            int b;
            while ((b = in.read()) != -1) {
                out.write(b);
            }
            return out.toByteArray();
        }
    }
}