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At this moment it's a nightmare to debug a maven based GWT project in netbeans. On my workplace we use GWT and GAE and I need to use the Eclipse IDE because NetBeans doesn't have good GWT support for Maven projects.
This old bug may not be relevant anymore. If you can still reproduce it in 8.2 development builds please reopen this issue. Thanks for your cooperation, NetBeans IDE 8.2 Release Boss