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In project,unde web or EJB module, add a JMS connector resource for server resource. Click register button of it two times. The following message is display. "pool. Use 'cascade' option to delete them as well." It should be like "Cannot register. Duplicate..."
The wrong error message is the server's response to the duplicate resource creation. Opened bug#6342755 against the Application Server.
Issue filed against server. Error messages are outside the plugin control.