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[ JDK VERSION : 1.7 ] I changed the Java home from java 6 installation to a java7 installation. I brought up the java platforms dialogs and when I move my mouse over the close button(sometimes after clicking it) I get an exception. I clicked the review and report and reported the exception after which the IDE locked up and is not responsive to user inputs either by mouse or keyboard.
Created attachment 103452 [details] Thread dump
It is a bug in JDK itself - javax.swing.text.View/s are manipulated outside AWT Event Thread. Possibly caused by the fix of http://bugs.sun.com/bugdatabase/view_bug.do?bug_id=4714674. Closing as WONTFIX on the NetBeans side.
Fixed in JDK7 b132