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steps to reproduce: 1. open nb.org's nbbuild/ + nbjunit/ projects 2. trigger run on nbbuild project, new IDE appears. 3. in the new IDE create a new Maven/NetBeans Application 4. build the *-Parent project that builds all created projects. 5. On the *-application project, trigger Custom > Goals... from popup. 6. enter Goal: surefire:test, Properties: maven.surefire.debug=true and run the build. The build should stop at listening on port 5005 (or similar) 7. Back to the initial IDE instance and add a breakpoint in NbModuleSuite.Configuration's constructor in nbjunit/ project. 8. Attach debugger and observe how debugger attaches, test is run but the IDE won't stop at breakpoint. Please note that doing the same without extra IDE instance in step 2 works.