attempt to create saveOrUpdate event with null entity

Question

Hello all,

I've run into a problem I can't figure out and Google search does not return much (I should of thought about posting my question here first ;-).

So I've got a GWT app, that makes a rpc call to a server to save/create a new entity. However, the Spring-Hibernate back-end throws an exception with the following error message:

'attempt to create saveOrUpdate event with null entity'

not sure what that means. What's null?? If it's a new entity I am saving, I am expecting to have the 'id' field be null or say 0 and then have hibernate fill it. right?

Answer 1

null entity could mean that saveOrUpdate() is actually receiving null as an argument, ie:

session.saveOrUpdate(null);

If you're using serialization to pass to object to a remote location (you mentioned RPC), perhaps you should check if serialization is working correctly. Something tells me that failing to serialize might end up with a null reference being passed.