Feature request: Show JPA-mapped classes and properties while navigating,...
A Java SQL client for any JDBC compliant database
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Closest to this request is SQuirreL's Hibernate (1) Plugin which comes as an optional Plugin with SQuirreL's installer. If you open a Session with the Plugin is installed the Session Panel contains a Hibernate tab right next to the SQL tab. On the upper right of the tab is a button to open the Hibernate configuration dialog. The dialog has a text field labeled "Information".
With a completed Hibernate configuration you will be able to connect to the configuration by the connect button right next the configuration button. When successfully connected you will be able to navigate through Entity classes and to issue JQL/HQL queries.
(1) It's probably save to say that Hibernate is the prime JPA implementation.