If I have two classes which both follow same structure and there are some JAX-RS web services mapping to same path in JAX-RS Web Services node in Project Explorer, there should be warning on both such places where it occurs and in Problems view. Warning should be about ambigous path for JAX-RS web services.

It's possible to have multiple items under JAX-RS Web Services node with same label.

Even though there are strategies to resolve order of evaluating path, there could be some cases where it's not enough. And such solution could help developer to find out if there are such flaws in design.