Mar 082013

I’ve found another annoyance with MyBatis (there are many so be on the lookout for a long blog post that covers everything). This one has to do with how MyBatis handles missing TypeHandlers and required a bit of time stepping through their code.

If you have an object that contains a field whose type is not registered with the TypeHandler registry, MyBatis does not always produce a nice exception for you. Instead, it sometimes decides to return null instead of creating your object.

Here is an example:

I’m using Joda’s DateTime object here. If you don’t register this with MyBatis, it can cause this code to fail:

The fix is to register the TypeHandler like this:

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