Having SerializationException when trying to return custom object type

I just create the most simple Singleton EJB to return a custom serializable object, but I'm getting the following exception when I invoke the remote method:

org.jboss.serial.exception.SerializationExcep开发者_JAVA百科tion: Could not create instance of model.Usuario - model.Usuario

It works fine with simple types and normal classes (String for example) but not for an object pertaining to a class I created.

I'm using JBoss 6.0 and Eclipse.

What could I be missing?

Thanks in advance, Saul

The class you are trying to serialize must implement the Serializable marker interface or extend a class that implements it. Also, every non-transient member of your class must also be Serializable.

1.You should make your Object implementing Serializable

2.Have all nonserializable fields marked as transient.