test/jdk/java/io/Serializable/resolveProxyClass/NonPublicInterface.java

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/* @test
 * @bug 4413817 8004928
 * @summary Verify that ObjectInputStream.resolveProxyClass can properly
 *          resolve a dynamic proxy class which implements a non-public
 *          interface not defined in the latest user defined class loader.
 */

import java.io.*;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Modifier;
import java.lang.reflect.Proxy;

public class NonPublicInterface {

    static class Handler implements InvocationHandler, Serializable {
        private static final long serialVersionUID = 1L;

        public Object invoke(Object obj, Method meth, Object[] args) {
            return null;
        }
    }

    public static final String nonPublicIntrfaceName = "java.util.zip.ZipConstants";

    public static void main(String[] args) throws Exception {
        Class<?> nonPublic = Class.forName(nonPublicIntrfaceName);
        if (Modifier.isPublic(nonPublic.getModifiers())) {
            throw new Error("Interface " + nonPublicIntrfaceName +
                    " is public and need to be changed!");
        }

        ByteArrayOutputStream bout = new ByteArrayOutputStream();
        ObjectOutputStream oout = new ObjectOutputStream(bout);
        oout.writeObject(Proxy.newProxyInstance(nonPublic.getClassLoader(),
            new Class<?>[]{ nonPublic }, new Handler()));
        oout.close();
        ObjectInputStream oin = new ObjectInputStream(
            new ByteArrayInputStream(bout.toByteArray()));
        oin.readObject();
    }
}