This Bugzilla instance is a read-only archive of historic NetBeans bug reports. To report a bug in NetBeans please follow the project's instructions for reporting issues.
Build: NetBeans IDE 8.0.2 (Build 201411181905) VM: Java HotSpot(TM) 64-Bit Server VM, 25.40-b25, Java(TM) SE Runtime Environment, 1.8.0_40-b26 OS: Windows Vista User Comments: bdruhan: The design area of the IDE seems to have become corrupted. My program seemed to be running fine. However, when I returned to the Design tab to edit my MainJFrame there was a message on the main panel "The following execption has been thrown during painting of the form. Use Navigator to fix or remove the problem" and there was a stack trace printed in a custom panel that I had added to the form suggesting a null pointer error. I believe the stack trace and the error are old errors. I had been receiving null pointer errors at exactly that point in the program, but I debugged the error and the code builds and runs with no errors. The only issue seems to be that I cannot use the Design tab because I cannot get rid of the message. I tried removing the custom panel and adding it back but the message would return. I tried using a try-catch block to catch the nullpointer exception with e.printStackTrace in the catch block to send a stack trace to the output window, but it did not catch a Stacktrace: java.lang.OutOfMemoryError: Java heap space at java.util.Arrays.copyOf(Arrays.java:3332) at java.lang.AbstractStringBuilder.expandCapacity(AbstractStringBuilder.java:137) at java.lang.AbstractStringBuilder.ensureCapacityInternal(AbstractStringBuilder.java:121) at java.lang.AbstractStringBuilder.append(AbstractStringBuilder.java:421) at java.lang.StringBuilder.append(StringBuilder.java:136) at org.netbeans.core.startup.logging.PrintStreamLogger.print(PrintStreamLogger.java:108)
Created attachment 153640 [details] stacktrace
The problem is caused by the following NPE from life.myGrid.paintComponent() java.lang.NullPointerException at life.myGrid.paintComponent(myGrid.java:62) at javax.swing.JComponent.paint(JComponent.java:1056) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JViewport.paint(JViewport.java:728) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JLayeredPane.paint(JLayeredPane.java:586) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at java.awt.GraphicsCallback$PaintCallback.run(GraphicsCallback.java:39) at sun.awt.SunGraphicsCallback.runOneComponent(SunGraphicsCallback.java:79) at sun.awt.SunGraphicsCallback.runComponents(SunGraphicsCallback.java:116) at java.awt.Container.paint(Container.java:1973) at org.netbeans.modules.form.fakepeer.FakePeerContainer.paint(FakePeerContainer.java:89) at javax.swing.JComponent.paintChildren(JComponent.java:903) at javax.swing.JComponent.paint(JComponent.java:1065) at org.netbeans.modules.form.ComponentLayer$DesignerPanel.paint(ComponentLayer.java:190) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at org.netbeans.modules.form.FormDesigner$1.paintChildren(FormDesigner.java:220) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JLayeredPane.paint(JLayeredPane.java:586) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JViewport.paint(JViewport.java:728) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JLayer.paint(JLayer.java:433) at javax.swing.plaf.LayerUI.paint(LayerUI.java:79) at org.netbeans.core.multiview.SplitLayerUI.paint(SplitLayerUI.java:157) at javax.swing.plaf.ComponentUI.update(ComponentUI.java:161) at javax.swing.JComponent.paintComponent(JComponent.java:780) at javax.swing.JLayer.paint(JLayer.java:428) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at org.netbeans.swing.tabcontrol.TabbedContainer.paint(TabbedContainer.java:994) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JLayeredPane.paint(JLayeredPane.java:586) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at org.netbeans.core.windows.view.ui.MainWindow$1.paint(MainWindow.java:189) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JLayeredPane.paint(JLayeredPane.java:586) at javax.swing.JComponent.paintChildren(JComponent.java:889) at javax.swing.JComponent.paint(JComponent.java:1065) at javax.swing.JComponent.paintToOffscreen(JComponent.java:5219) at javax.swing.RepaintManager$PaintManager.paintDoubleBuffered(RepaintManager.java:1572) at javax.swing.RepaintManager$PaintManager.paint(RepaintManager.java:1495) at javax.swing.RepaintManager.paint(RepaintManager.java:1265) at javax.swing.JComponent._paintImmediately(JComponent.java:5167) at javax.swing.JComponent.paintImmediately(JComponent.java:4978) at javax.swing.RepaintManager$4.run(RepaintManager.java:824) at javax.swing.RepaintManager$4.run(RepaintManager.java:807) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:807) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:782) at javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:731) at javax.swing.RepaintManager.access$1300(RepaintManager.java:64) at javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1720) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:749) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:702) at java.awt.EventQueue$3.run(EventQueue.java:696) at java.security.AccessController.doPrivileged(Native Method) at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:75) at java.awt.EventQueue.dispatchEvent(EventQueue.java:719) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82) This error is thrown so many times that it filed NetBeans memory and messages.log.