i use eclipse kepler and download eclipseLink 2.5.0 and add to libraries. also download JPA Diagram Editor from Marketplace.
but, when right-click on JPA Content, no items is exist, and, when right-click on project and from "JPA Tools" menu click on "open diagram", no things is happened.
also, when in project's properties click on JPA Diagram Editor, show error.
Why?