Upon checking in the channel with maxandersen, he found that the following code is related:

• Validates that the method parameters annotated with {@link Context}

  are of the supported types in the spec:

• {@link UriInfo}

  ,

  {@link HttpHeaders}

  ,

  {@link ServletConfig}

  ,

  {@link ServletContext}

  ,

  {@link HttpServletRequest}

  ,

• {@link Request}

  ,

  {@link HttpServletResponse}

  and

  {@link Response}

  ws/plugins/org.jboss.tools.ws.jaxrs.core/src/org/jboss/tools/ws/jaxrs/core/internal/metamodel/domain/JaxrsResourceMethod.java

According to the above javadoc, @Context is legal with HttpServletRequest.
However, the plugin produces an error on the following line of code (for example):
public Response get(@Context HttpServletRequest requestContext, @PathParam(EntitiesRestConsts.PARAM_ID) ObjectId id) {