Hibernate version: 3.1.2

I'm trying to make an association that is optional, i.e. class A may reference an instance of B, but the reference may also be null.

The assocation is declared as:



But this is causing a NullPointerException when fetching the object having this association.

Is there some way of declaring [many|one]-to-one-or-zero that I don't know about? The only other solution I can imagine is use a collection association as the collection can be empty, but that's not a very satisfactory solution.

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Ah... It works fine, I had just put in some extra code to handle some legacy stuff and this was actually the cause of the error. Please disregard my post.