The object you are trying to use is not Serializable. You can't use un-serializable objects in a distributed architecture. com.sisl.snms.client.cm.workflow.jaxb.Workflow (whatever that is) appears not to implement Serializable.
now one strange thing my saving functionality is working at client end means saving of xml at client is working. Now I am reading it and then saving this dom object at server is working fine. The diff is only earlier i was saving xml directly at server that is not working but when i am saving it client then reading dom and saving dom internally at server is working fine.