[jboss-user] [Remoting] - InstantiationException with client passed proxies

[cdelashmutt]

I;m trying to code up a little example using JBoss Remoting 1.4.4 in JBoss AS 4.0.4.GA, and JBoss Serialization.  This example is based on the "Trasporters sample - proxy" example in the user guide.

I've got an MBean that manages the lifecycle of a socket based Remoting server that has a few methods in it.  The client can get a reference to the server (hosted at socket://localhost:5400/?serializationtype=jboss), and call a method on the server that returns a String with no problems.  However, if I try to create a proxy for a pojo on the client and pass that into the server, I get an InstatiationException from within the remoting framework when I call a method on the server and pass in the proxy.

Here is a snippet from the TestClient main method:

  | //Get the remote server
  | remote = (TestRemote) TransporterClient.createTransporterClient(
  | 	"socket://localhost:5400/?serializationtype=jboss",
  | 	TestRemote.class);
  | 
  | //Just test out getting a simple String
  | String classPath = remote.getMyClasspath();
  | System.out.println("Server Classpath: " + classPath);
  | 
  | //Create a new PersonImpl which implements a Person interface
  | PersonImpl aPerson = new PersonImpl("Chris DeLashmutt");
  | aPerson.setAge(31);
  | System.out.println("Asserting Person " + aPerson.getName()
  | 					+ " with age of " + aPerson.getAge());
  | 
  | //Create a local server for the Person proxy 
  | server = TransporterServer.createTransporterServer(
  | 	"socket://localhost:5401/?serializationtype=jboss",
  | 	aPerson, Person.class.getName());
  | 
  | //Create the proxy to pass to the server
  | Person personProxy = (Person) TransporterClient
  | 	.createTransporterClient(
  | 		"socket://localhost:5401/?serializationtype=jboss",
  | 		Person.class);
  | 
  | //Pass the person to the server
  | remote.assertFact(personProxy);
  | 
  | //Have the server set a random age on the Person through the proxy
  | System.out.println("Fireing rules");
  | remote.applyRules();
  | 
  | //Show the new age of the person
  | System.out.println("Person " + aPerson.getName()
  | 	+ " now has age of " + aPerson.getAge());
  | 

The server is very simple, and the exception I get is on the server side, but before my method actually gets invoked.  The Person interface just specifies a couple getters/setters for name and age, and the PersonImpl is just a POJO with a no-arg constructor, and a String constructor to set the name.

The exception I get is a SerializationException caused by an InstantiationException.  It looks like the error is coming from the Remoting code trying to instantiate an org.jboss.remoting.transport.local.LocalClientInvoker, but there isn't any no-arg constructor for that class, so it fails.


  | 13:55:11,187 ERROR [ServerThread] failed
  | org.jboss.serial.exception.SerializationException: Could not create instance of org.jboss.remoting.transport.local.LocalClientInvoker - org.jboss.remoting.transport.local.LocalClientInvoker
  | 	at org.jboss.serial.classmetamodel.ClassMetaData.newInstance(ClassMetaData.java:327)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:239)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353)
  | 	at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353)
  | 	at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.persister.ProxyPersister.readData(ProxyPersister.java:66)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.persister.ArrayPersister.readObjectArray(ArrayPersister.java:196)
  | 	at org.jboss.serial.persister.ArrayPersister.readData(ArrayPersister.java:172)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353)
  | 	at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readSlotWithFields(RegularObjectPersister.java:353)
  | 	at org.jboss.serial.persister.RegularObjectPersister.defaultRead(RegularObjectPersister.java:273)
  | 	at org.jboss.serial.persister.RegularObjectPersister.readData(RegularObjectPersister.java:241)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.readObjectDescriptionFromStreaming(ObjectDescriptorFactory.java:411)
  | 	at org.jboss.serial.objectmetamodel.ObjectDescriptorFactory.objectFromDescription(ObjectDescriptorFactory.java:81)
  | 	at org.jboss.serial.objectmetamodel.DataContainer$DataContainerDirectInput.readObject(DataContainer.java:639)
  | 	at org.jboss.serial.io.JBossObjectInputStream.readObjectOverride(JBossObjectInputStream.java:165)
  | 	at java.io.ObjectInputStream.readObject(ObjectInputStream.java:333)
  | 	at org.jboss.remoting.serialization.impl.jboss.JBossSerializationManager.receiveObject(JBossSerializationManager.java:127)
  | 	at org.jboss.remoting.marshal.serializable.SerializableUnMarshaller.read(SerializableUnMarshaller.java:66)
  | 	at org.jboss.remoting.transport.socket.ServerThread.processInvocation(ServerThread.java:350)
  | 	at org.jboss.remoting.transport.socket.ServerThread.dorun(ServerThread.java:412)
  | 	at org.jboss.remoting.transport.socket.ServerThread.run(ServerThread.java:239)
  | Caused by: java.lang.InstantiationException: org.jboss.remoting.transport.local.LocalClientInvoker
  | 	at java.lang.Class.newInstance0(Class.java:335)
  | 	at java.lang.Class.newInstance(Class.java:303)
  | 	at org.jboss.serial.classmetamodel.ClassMetaData.newInstance(ClassMetaData.java:319)
  | 	... 44 more
  | 

What am I doing wrong here?

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