IDE freezes after configuring JAX-RS 1.1

-start eclipse with fresh new workspace

-create dynamic web project for JBoss 6.0
-create new class: package x; import javax.ws.rs.Path; @Path("/xxx") public class Y{}
-do configure -> Add JAX-RS 1.1 support..

=> eclipse freezes

another way to get to freeze:
-create dynamic web project for EAP 5.x
-create sample restful ws in the project

=> shouldn't JAX-RS support be configured for the project now?

-do configure -> Add JAX-RS 1.1 support..

=> eclipse freezes

thread dump is attached