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Instance of org.netbeans.modules.java.j2seproject.J2SEProject is held by org.netbeans.modules.javawebstart.ui.customizer.JWSProjectProperties - for details see the heapdump at http://netbeans.org/projects/performance/downloads/download/heapdumps/heapdump_mem_leak.zip
fixed by the fix to Issue #219827. in jetmain: http://hg.netbeans.org/jet-main/rev/569ba1b5a7c2 Note that the changeset includes changes in both WebStart and FX Project modules (JFXProjectProperties and JWSProjectProperties lifecycle and persistence mechanism is changed considerably) in order to fix the memory leak that was present in both of them.