I do not know if anyone else has run into this before or not. This is only happening with JSON format. The API works for XML.

I am using CXF library.

javax.ws.rs.InternalServerErrorException
    at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
    at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
    at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
    at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
    at org.apache.cxf.jaxrs.client.AbstractClient.convertToWebApplicationException(AbstractClient.java:461)
    at org.apache.cxf.jaxrs.client.WebClient.doInvoke(WebClient.java:860)
    at org.apache.cxf.jaxrs.client.WebClient.doInvoke(WebClient.java:831)
    at org.apache.cxf.jaxrs.client.WebClient.invoke(WebClient.java:394)
    at org.apache.cxf.jaxrs.client.WebClient.get(WebClient.java:573)