Create a JAX-RS validation error such as

@GET
@Path("/{id}")
public AttendeeRepresentation getAttendee(@PathParam("ide") final int id) { 
...
}

ASSERT: an error decorator appears on the JAX-RS Endpoint in the project explorer.

Fix the problem (change "ide" -> "id")

ASSERT: the error decorator should disappear
FAIL the error decorator remains visible.