Packaging Apache Wink APIs with your application might require application changes

When the Apache Wink APIs are packaged with the application, the application must provide a subclass of javax.ws.rs.core.Application, and at least one of the getClasses() and getSingletons() method implementations must not return null. These conditions prevent JAX-RS 2.0 from automatically scanning for provider classes, which could result in redundant providers because Apache Wink is packaged with the application. The presence of redundant providers might cause the application to not work correctly. Check your application for these conditions, and make any required changes.

For more information on JAX-RS 2.0 behavior changes, see JAX-RS 2.0 behavior changes.