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This bug was originally marked as duplicate of bug 194929, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.2.1 (Build 201210100934) VM: Java HotSpot(TM) 64-Bit Server VM, 19.0-b09, Java(TM) SE Runtime Environment, 1.6.0_23-b05 OS: Windows 7 User Comments: GUEST: Deleted a folder, didn't disappear from the Projects list, then tried to expand/collapse the parent folder. GUEST: Updating files via CVS; an expanded portion of the tree became blank. The space that should have been taken up by the file display was simply white. I closed & re-expanded portions of the tree with similar results. After doing so several times, the error seems to have resolved rupertkey: [NB6.5Beta1] C/C++ Project: In the Classes panel, expanding the C src file name to show functions gives exception (although the tree shows correct list of functions). GUEST: Estava tentando excluir uma pasta twoelectric: Opened a new Kenai project. This may be due to the warning of "source folder" not defined. GUEST: Updating from CVS. Everything below web pages in my web app became unclickable GUEST: deleted the build folder GUEST: Sorry, My english is not good!! When I open package the Netbeans show me this message. I am not use Swing, my project is JSF2 whith spring. Bruno Hahn Barreto jrcampins: deleteing a folder Stacktrace: java.lang.NullPointerException at com.sun.java.swing.plaf.windows.WindowsTreeUI.ensureRowsAreVisible(WindowsTreeUI.java:74) at javax.swing.plaf.basic.BasicTreeUI.toggleExpandState(BasicTreeUI.java:2208) at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2191) at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2149) at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3511) at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressedDND(BasicTreeUI.java:3497)
Created attachment 131013 [details] stacktrace
Swing related problem previously identified as JDK problem.
All reports are from JDK 1.6, I suggest closing as WONTFIX unless it's reproducible with JDK 1.7
*** Bug 225435 has been marked as a duplicate of this bug. ***
Please reopen if reproducible in JDK 1.7, thanks.