UnmarshalException:error unmarshalling return;nested exception ClassNotFoun

Question

Hi,
I have written a client for an enterprise application. The client communicates with the application using APIs provided by the application that internally make RMI calls to the application server.
I am getting the following error when the client invokes a remote method.
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
    java.lang.ClassNotFoundException: <a.b.c.MyClass>
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:169)The class 'a.b.c.MyClass' is included in the client JAR as well as in the server installation directory. The classes in this directory will be added by server into its classpath automatically. The client and server are running on the same machine but have different classpaths.
The remote method uses class 'a.b.c.MyClass' in both input parameter and return type.
This method returns a list of objects found as specified by the input parameters. The input parameter and the result both use the 'a.b.c.MyClass'.
The code is able to make the call, the server processes the call, but it is failing wihle returning the result. I am not able to understand why it is failing for Unmarshalling the class that it has already (marshalled) used while sending the input parameters.
The code was working fine previously. I am not able to find out what has made it not working.
Waiting for your valuable help.
Providing the complete stack trace for reference
    java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
    java.lang.ClassNotFoundException: <package.class>
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:169)
    at wt.method.MethodServerImpl_Stub.invoke(Unknown Source)
    at wt.method.RemoteMethodServer.invoke(RemoteMethodServer.java:616)
    at wt.fc.PersistenceManagerFwd.find(PersistenceManagerFwd.java:215)
    at ... Client call stack
    at AppSide_Connector.BusObjJavaInterface.poll(BusObjJavaInterface.java:584)
    at AppSide_Connector.AppCalls.poll(AppCalls.java:192)
    at AppSide_Connector.AgentBusinessObjectManager.poll(AgentBusinessObjectManager.java:717)
    at AppSide_Connector.AppPolling.poll(AppPolling.java:310)
    at AppSide_Connector.AppPolling.doPollingContinuousWait(AppPolling.java:574)
    at AppSide_Connector.AppPolling.run(AppPolling.java:137)
    at java.lang.Thread.run(Thread.java:534)
Caused by: java.lang.ClassNotFoundException: <package.class>
    at java.net.URLClassLoader$1.run(URLClassLoader.java:199)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:187)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:289)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:235)
    at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:302)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:219)
    at java.io.ObjectInputStream.resolveClass(ObjectInputStream.java:558)
    at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1513)
    at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1435)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1626)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at wt.fc.QueryResult$ChunkedExternalization.readObject(QueryResult.java:449)
    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
    at java.lang.reflect.Method.invoke(Method.java:324)
    at java.io.ObjectStreamClass.invokeReadObject(ObjectStreamClass.java:838)
    at java.io.ObjectInputStream.readSerialData(ObjectInputStream.java:1746)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1646)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at wt.fc.QueryResult.readExternal(QueryResult.java:156)
    at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1686)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1644)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at wt.method.MethodResult.readExternal(MethodResult.java:144)
    at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1686)
    at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1644)
    at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1274)
    at java.io.ObjectInputStream.readObject(ObjectInputStream.java:324)
    at sun.rmi.server.UnicastRef.unmarshalValue(UnicastRef.java:297)
    at sun.rmi.server.UnicastRef.invoke(UnicastRef.java:146)
    ... 15 moreRegards,
jsk1

Answer 1

did you get the answer, can you share that, am stuck with similar problem
My remote call returns an object of some pojo which is generated from the class in a jar file. I get this exception
Client exception: java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: com.xx.fir.xxxx.entity.Crdxx (no security manager: RMI class loader disabled)
java.rmi.UnmarshalException: error unmarshalling return; nested exception is:
java.lang.ClassNotFoundException: com.xx.fir.xxxx.entity.Crdxx (no security manager: RMI class loader disabled)
Also my ant traget:
<java classname="com.xxx.cache.CacheServiceEndPoint" fork="yes">
<jvmarg value="-Djava.rmi.server.codebase=file:/${build}/classes/ file:/${lib}/{color:#ff0000}hibernate-credit.jar{color}" />{color:#ff0000} jar file where the pojo resides
{color}<jvmarg value="-Djava.security.policy=C:/workspace/Cache/policy.all" />
thx in advance