I have a EJB3 on JBoss that return a class mapped with hibernate. This class extends from Serializable (required by hibernate).

When I return this class with my EJB, i have a error:
Caused by: java.lang.ClassNotFoundException: org.hibernate.proxy.pojo.javassist.SerializableProxy
at org.jboss.remoting.serialization.ClassLoaderUtility.loadClass(ClassLoaderUtility.java:103)
at org.jboss.remoting.loading.RemotingClassLoader.loadClass(RemotingClassLoader.java:86)
at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
at java.lang.Class.forName0(Native Method)
at java.lang.Class.forName(Class.java:247)
at org.jboss.remoting.loading.ObjectInputStreamWithClassLoader.resolveClass(ObjectInputStreamWithClassLoader.java:179)
at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1575)
at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496)
at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732)
at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329)
...

I think that the problem is a variable type java.util.date, i go to test it and try again with java.sql.date