After upgrading the JEE library to JEE7 (ECA-7791) it became clear that we bundle a JAX-RS 2.0 implementation, while this should now be provided by the application server.

We also bundle a an embedded JAX-RS 1.1 server tjws-2.3.7 used by unit testing which now fails after the API JAR has been updated.

Resteasy 2.3.7 is JAX-RS 1.1.
Resteasy 3.0.1 is JAX-RS 2.0.

Since our API automatic mapping to snake_case of responses and dates to ISO8601 format using com.fasterxml.jackson.databind.ObjectMapper we need to ensure that we can rely on the app-servers implementation or that we wont conflict with it if we keep bundling and maintaining Jackson.

Or that the standard @javax.xml.bind.annotation.XmlElement's name="variable_name" is respected, so we no longer need to maintain these libraries. → According to https://docs.oracle.com/javaee/7/tutorial/jsonp005.htm this would be non-standard and JSON Binding 1.0 will be available in JEE8. For now JSON Processing 1.0 (JSR 353) would be used "manually" together with JAX-RS 2.0.