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It may cause unpredictable errors in code that relies on general contract of java.util.Properties. Steps to reproduce: run System.getProperties().list(System.err); using internal execution. Result: java.lang.ClassCastException: org.netbeans.core.windows.frames.DefaultContainerImpl$2 at java.util.Properties.list(Properties.java:528) at test.ListProperties.main(ListProperties.java:26) at java.lang.reflect.Method.invoke(Native Method) at org.openide.execution.ThreadExecutor.executeClass(ThreadExecutor.java:132) at org.openide.execution.ThreadExecutor$TERunnable.run(ThreadExecutor.java:209) at org.netbeans.core.execution.RunClassThread.run(RunClassThread.java:118)
*** This issue has been marked as a duplicate of 11920 ***
Resolved for 3.4.x or earlier, no new info since then -> verified.
Resolved for 3.4.x or earlier, no new info since then -> closing.