Cannot proxy java.net.SocketImpl

[bmarwell]

Hi,

I would like to proxy the class java.net.SocketImpl.

I created an implementation of SocketImplFactory like so:

import javassist.ClassPool;
import javassist.util.proxy.ProxyFactory;

import java.net.SocketImpl;
import java.net.SocketImplFactory;

class SocketProxyFactory implements SocketImplFactory {
  private final SocketImpl defaultSocketImpl;

  public SocketFactoryProxy(final SocketImpl defaultSocketImpl) {
    this.defaultSocketImpl = defaultSocketImpl;
  }

  @Override
  public SocketImpl createSocketImpl() {
    final ProxyFactory proxyFactory = new ProxyFactory();
    proxyFactory.setSuperclass(SocketImpl.class);

    try {
      return (SocketImpl) proxyFactory.create(
          new Class<?>[0], new Object[0], new SocketProxy(this.defaultSocketImpl)
      );
    } catch (final Exception ex) {
      throw new IllegalStateException("Cannot construct proxy.", ex);
    }
  }
}

When I run the code, I get:

javassist.CannotCompileException: The package of the requested class: javassist.util.proxy is different from the package of the lookup class: java.net: java.net.SocketImpl has no permission to define the class

Is there anything I could do here? I want to delegate all methods but one.

env

Compiling with JDK >= 11 (any) to maven.compiler.release = 8.
I tried Java 11, 14 and 15 from zulu, adopt-openjdk-hotspot and adopt-openjdk-openj9.

[NingZhang-e]

Which Javassist version are you using?
Seems same as #228
It has been fixed in latest version.