code: @Test public void testCustomException(){
    HessianServiceImpl server=new HessianServiceImpl();
    ProxyFactory proxyFactory=ExtensionLoader.getExtensionLoader(ProxyFactory.class).getAdaptiveExtension();
    Protocol protocol=ExtensionLoader.getExtensionLoader(Protocol.class).getAdaptiveExtension();
    URL url=URL.valueOf("hessian://127.0.0.1:5342/" + HessianService.class.getName() + "?version=1.0.0");
    Exporter<HessianService> exporter=protocol.export(proxyFactory.getInvoker(server,HessianService.class,url));
    Invoker<HessianService> invoker=protocol.refer(HessianService.class,url);
    HessianService client=proxyFactory.getProxy(invoker);
    try {
      client.customException();
      fail();
    }
   catch (  MyException expected) {
    }
    invoker.destroy();
    exporter.unexport();
  }
  