Hello,
as discussed here:

https://groups.google.com/forum/#!topic/drools-setup/85k05vo0Ix8

I'm trying to configure the JSONMarshaller so I can serialize/deserialize objects of type javax.money.MonetaryAmount, however even though I register my own JSONMarshallerExtension seems like the conversion is handled by the customSerializationMapper in JSONMarshaller.configureMarshaller() and this mapper is not passed to the extension so there's no way I can configure it. This leads to the attributes of type MonetaryAmount being serialized in a wrong way (not using any modules registered through the JSONMarshallerExtension.