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Register a custom Jackson ObjectMapper using Spring Javaconfig

For a project for a client I’m working on, we are creating a JSON REST interface as a proxy for other systems. Our system collects data and transforms it to be used by the clients of our API. Most of the data we send are Strings, but for a new feature, we are migrating some of our code to Joda Money, a very convenient way of handling basic money operations.

To send our Money data back to our clients, we do a bit of conversion. For this, we use a Jackson Serializer, which looks a bit like this:

However, finding out how to register this class was a bit a hassle, and turned out to be trivial once we found out. To register the Serializer, you’ll need to have a custom ObjectMapper, like the following:

Then we need to register the ObjectMapper in the JavaConfig of our Spring application. This can be done with the following configuration:

And that’s it. Now Jackson is automatically configured to convert all Money objects to cents using the ObjectMapper. I hope this helps for people who need this in the future so that it might save some time!