Session bean throws java.io.NotSerializableException

[erden]

Accessing a remote session bean from another machine with trans-attribute Required throws a java.io.NotSerializableException

I have client statefull session bean. From that bean I am trying to access from another server remotely another session bean.
Defining the trans-attribute of the client session bean as

<ejb-name>ClientSessionBean</ejb-name>
<method-name>*</method-name>

<trans-attribute>Required</trans-attribute>

throws a java.io.NotSerializableException
It works fine when you define it

<ejb-name>ClientSessionBean</ejb-name>
<method-name>*</method-name>

<trans-attribute>NotSupported</trans-attribute>
also it works fine when you have them inside the same jar file and you accessing that remotely.

Doesn't make any difference the <trans-attribute> of the server session bean. It works fine with both Required and NotSupported.

I am using jboss-3.1.0alpha build as of 01/08/2002, jdk1.3.1_03, and win2000

The error stack that I get is as follows.
2002-08-02 09:09:29,071 ERROR [STDERR] java.rmi.MarshalException: error marshalling arguments; nested exception is:
java.io.NotSerializableException: org.jboss.tm.TransactionImpl
2002-08-02 09:09:29,071 ERROR [STDERR] java.io.NotSerializableException: org.jboss.tm.TransactionImpl
2002-08-02 09:09:29,071 ERROR [STDERR] at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1143)
2002-08-02 09:09:29,071 ERROR [STDERR] at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:361)
2002-08-02 09:09:29,071 ERROR [STDERR] at org.jboss.invocation.MarshalledInvocation.writeExternal(MarshalledInvocation.java:360)
2002-08-02 09:09:29,071 ERROR [STDERR] at java.io.ObjectOutputStream.outputObject(ObjectOutputStream.java:1167)
2002-08-02 09:09:29,071 ERROR [STDERR] at java.io.ObjectOutputStream.writeObject(ObjectOutputStream.java:361)
2002-08-02 09:09:29,071 ERROR [STDERR] at sun.rmi.server.UnicastRef.marshalValue(UnicastRef.java:263)
2002-08-02 09:09:29,081 ERROR [STDERR] at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:101)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.invocation.jrmp.server.JRMPInvoker_Stub.invoke(Unknown Source)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.invocation.jrmp.interfaces.JRMPInvokerProxy.invoke(JRMPInvokerProxy.java:127)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.invocation.InvokerInterceptor.invoke(InvokerInterceptor.java:92)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.proxy.TransactionInterceptor.invoke(TransactionInterceptor.java:51)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.proxy.SecurityInterceptor.invoke(SecurityInterceptor.java:48)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.proxy.ejb.HomeInterceptor.invoke(HomeInterceptor.java:175)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.proxy.ClientContainer.invoke(ClientContainer.java:82)
2002-08-02 09:09:29,081 ERROR [STDERR] at $Proxy260.create(Unknown Source)
2002-08-02 09:09:29,081 ERROR [STDERR] at bluecycle.eclaims.server.ejb.request.RequestSessionBean.createAuction(RequestSessionBean.java:98)
2002-08-02 09:09:29,081 ERROR [STDERR] at java.lang.reflect.Method.invoke(Native Method)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.ejb.StatelessSessionContainer$ContainerInterceptor.invoke(StatelessSessionContainer.java:606)
2002-08-02 09:09:29,081 ERROR [STDERR] at org.jboss.resource.connectionmanager.CachedConnectionInterceptor.invoke(CachedConnectionInterceptor.java:186)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.StatelessSessionInstanceInterceptor.invoke(StatelessSessionInstanceInterceptor.java:77)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.AbstractTxInterceptor.invokeNext(AbstractTxInterceptor.java:108)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.TxInterceptorCMT.runWithTransactions(TxInterceptorCMT.java:179)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.TxInterceptorCMT.invoke(TxInterceptorCMT.java:61)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.SecurityInterceptor.invoke(SecurityInterceptor.java:130)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.LogInterceptor.invoke(LogInterceptor.java:204)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.plugins.ProxyFactoryFinderInterceptor.invoke(ProxyFactoryFinderInterceptor.java:154)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.StatelessSessionContainer.invoke(StatelessSessionContainer.java:303)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.ejb.Container.invoke(Container.java:673)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.mx.server.MBeanServerImpl.invoke(MBeanServerImpl.java:549)
2002-08-02 09:09:29,091 ERROR [STDERR] at org.jboss.invocation.jrmp.server.JRMPInvoker.invoke(JRMPInvoker.java:325)
2002-08-02 09:09:29,091 ERROR [STDERR] at java.lang.reflect.Method.invoke(Native Method)
2002-08-02 09:09:29,091 ERROR [STDERR] at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:236)
2002-08-02 09:09:29,091 ERROR [STDERR] at sun.rmi.transport.Transport$1.run(Transport.java:147)
2002-08-02 09:09:29,091 ERROR [STDERR] at java.security.AccessController.doPrivileged(Native Method)
2002-08-02 09:09:29,091 ERROR [STDERR] at sun.rmi.transport.Transport.serviceCall(Transport.java:143)
2002-08-02 09:09:29,091 ERROR [STDERR] at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:460)
2002-08-02 09:09:29,091 ERROR [STDERR] at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:701)
2002-08-02 09:09:29,091 ERROR [STDERR] at java.lang.Thread.run(Thread.java:479)

[dudoes]

You should return a Serializable value of the Method in session Bean.

to Do it in XYZ.java:
------------------------------------------
import java.io.*

............


public class XYZ implements Serializable
{
......
}


---------------------------------

[erden]

All my methods return serializable objects (At both servers). Moreover the method that I am actually trying to call is void.
This exception is thrown before calling the bussiness method, it is actually when I am trying to create the session object.

[joelvogt]

You might want to check any exceptions you are throwing from your methods are okay as well

[erden]

No there are no user defined exceptions thrown. Below is an example of the code that I am using
This is my client session ejb on machine A
public class ClientSessionBean implements SessionBean {
private SessionContext ctx;
public ClientSessionBean(){}
public void setSessionContext(SessionContext context) {ctx = context;}
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void ejbCreate() throws CreateException {}

public void clientMethod() {
try {
ServerSessionHome serverSessionHome = (ServerSessionHome)PortableRemoteObject.narrow(namingContext.lookup("ServerSessionHome"),ServerSessionHome.class);
// The next line throws the serializable exception
ServerSession serverSession = serverSessionHome.create();
// It doesn't reach here
serverSession.remoteMethod();
}
catch (Exception exp) { exp.printStackTrace(); }
}
}

This is my server session ejb on machine B
public class ServerSessionBean implements SessionBean {
private SessionContext ctx;
public ServerSessionBean(){}
public void setSessionContext(SessionContext context) {ctx = context;}
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void ejbCreate() throws CreateException {}

public void remoteMethod()
{
// Do nothing
}
}

[erden]

No there are no user defined exceptions thrown. Below is an example of the code that I am using
This is my client session ejb on machine A
public class ClientSessionBean implements SessionBean {
private SessionContext ctx;
public ClientSessionBean(){}
public void setSessionContext(SessionContext context) {ctx = context;}
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void ejbCreate() throws CreateException {}

public void clientMethod() {
try {
ServerSessionHome serverSessionHome = (ServerSessionHome)PortableRemoteObject.narrow(namingContext.lookup("ServerSessionHome"),ServerSessionHome.class);
// The next line throws the serializable exception
ServerSession serverSession = serverSessionHome.create();
// It doesn't reach here
serverSession.remoteMethod();
}
catch (Exception exp) { exp.printStackTrace(); }
}
}

This is my server session ejb on machine B
public class ServerSessionBean implements SessionBean {
private SessionContext ctx;
public ServerSessionBean(){}
public void setSessionContext(SessionContext context) {ctx = context;}
public void ejbActivate(){}
public void ejbPassivate(){}
public void ejbRemove(){}
public void ejbCreate() throws CreateException {}

public void remoteMethod()
{
// Do nothing
}
}

[biske]

I've run into this as well, and the posted solution was to change the JBoss configuration to use Tyrex as the transaction manager. The out-of-the-box transaction manager doesn't support distributed transactions (hence, the TransactionImpl class is not serializable). Unfortunately, I haven't been able to get the 3.0.0 distribution to work with Tyrex. Evidently, there's a tyrex-patch.jar in the current nightly source, but merely dropping that into the pre-packaged 3.0.0 distribution causes all sorts of problems. Do a search on Tyrex in this forum, and you'll find the messages containing the details on all of this.