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This problem, originally described in issue #167776 was either not fully fixed, or the bug re-appeared with a less frequent reproducibility. See https://netbeans.org/bugzilla/show_bug.cgi?id=167776#c27 for the description. When the debugger gets into this blocked state, it might be helpful to see the full thread dump (http://wiki.netbeans.org/GenerateThreadDump).