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This bug was originally marked as duplicate of bug 191781, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 7.1.2 (Build 201204101705) VM: Java HotSpot(TM) Client VM, 11.2-b01, Java(TM) SE Runtime Environment, 1.6.0_12-b04 OS: Windows Vista User Comments: GUEST: i am getting error dcherk: closing a project GUEST: expand a project. GUEST: Opening the project tree earlGrey: Working with the Services Panel the error occured while i'm using my scrollwheel mouse. 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:2213) at javax.swing.plaf.basic.BasicTreeUI.handleExpandControlClick(BasicTreeUI.java:2196) at javax.swing.plaf.basic.BasicTreeUI.checkForClickInExpandControl(BasicTreeUI.java:2154) at javax.swing.plaf.basic.BasicTreeUI$Handler.handleSelection(BasicTreeUI.java:3516) at javax.swing.plaf.basic.BasicTreeUI$Handler.mousePressedDND(BasicTreeUI.java:3502)
Created attachment 130751 [details] stacktrace
*** This bug has been marked as a duplicate of bug 225720 ***