Hi Clemens,
Hi,
I recently got a really strange NPE when running Java2Demo, and by
looking at the code it seems this NPE can only be caused by threading
violations.
(Component.maxSizeSet set to true, while Component.maxSize not visible)
I had a look at Java2Demo's source, where I found code like this
(ClipAnim.DemoControls.run()):
@Override
public void run() {
((AbstractButton) toolbar.getComponentAtIndex(2)).doClick();
}
According to CustomControls.start(), this overriden run-method is
executed on a fresh thread, so outside of the EDT.
May AbstractButton.doClick() be called from outside the EDT?
Of course all Swing methods (if javadoc doesn't say the opposite) must
be called from EDT thread. I filed CR 7107119 (NPE when running
Java2Demo), which should become visible on bugs.sun.com soon.
Thanks, Pavel
Furthermore, is there any reason CustomControls.stop() is
synchronized, while start() isn't?
Thanks, Clemens
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at java.awt.Dimension.<init>(Dimension.java:111)
at java.awt.Component.getMaximumSize(Component.java:2751)
at java.awt.Container.getMaximumSize(Container.java:1887)
at javax.swing.JComponent.getMaximumSize(JComponent.java:1698)
at javax.swing.BoxLayout.checkRequests(BoxLayout.java:484)
at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:300)
at
javax.swing.JToolBar$DefaultToolBarLayout.preferredLayoutSize(JToolBar.java:771)
at java.awt.Container.preferredSize(Container.java:1788)
at java.awt.Container.getPreferredSize(Container.java:1773)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1662)
at java.awt.FlowLayout.layoutContainer(FlowLayout.java:609)
at java.awt.Container.layout(Container.java:1503)
at java.awt.Container.doLayout(Container.java:1492)
at java.awt.Container.validateTree(Container.java:1688)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validate(Container.java:1623)
at
javax.swing.RepaintManager.validateInvalidComponents(RepaintManager.java:653)
at
javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1620)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.BoxLayout.preferredLayoutSize(BoxLayout.java:301)
at
javax.swing.JToolBar$DefaultToolBarLayout.preferredLayoutSize(JToolBar.java:771)
at java.awt.Container.preferredSize(Container.java:1788)
at java.awt.Container.getPreferredSize(Container.java:1773)
at javax.swing.JComponent.getPreferredSize(JComponent.java:1662)
at java.awt.FlowLayout.layoutContainer(FlowLayout.java:609)
at java.awt.Container.layout(Container.java:1503)
at java.awt.Container.doLayout(Container.java:1492)
at java.awt.Container.validateTree(Container.java:1688)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validateTree(Container.java:1697)
at java.awt.Container.validate(Container.java:1623)
at
javax.swing.plaf.basic.BasicTabbedPaneUI.ensureCurrentLayout(BasicTabbedPaneUI.java:1446)
at
javax.swing.plaf.basic.BasicTabbedPaneUI.paint(BasicTabbedPaneUI.java:787)
at
javax.swing.plaf.metal.MetalTabbedPaneUI.paint(MetalTabbedPaneUI.java:843)
at
javax.swing.plaf.metal.MetalTabbedPaneUI.update(MetalTabbedPaneUI.java:724)
at javax.swing.JComponent.paintComponent(JComponent.java:778)
at javax.swing.JComponent.paint(JComponent.java:1054)
at javax.swing.JComponent.paintChildren(JComponent.java:887)
at javax.swing.JComponent.paint(JComponent.java:1063)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5221)
at
javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:295)
at javax.swing.RepaintManager.paint(RepaintManager.java:1206)
at javax.swing.JComponent._paintImmediately(JComponent.java:5169)
at javax.swing.JComponent.paintImmediately(JComponent.java:4980)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:770)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:728)
at
javax.swing.RepaintManager.prePaintDirtyRegions(RepaintManager.java:677)
at javax.swing.RepaintManager.access$700(RepaintManager.java:59)
at
javax.swing.RepaintManager$ProcessingRunnable.run(RepaintManager.java:1621)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
at java.awt.EventQueue.access$000(EventQueue.java:101)
at java.awt.EventQueue$3.run(EventQueue.java:666)
at java.awt.EventQueue$3.run(EventQueue.java:664)
at java.security.AccessController.doPrivileged(Native Method)
at
java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
at
java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at
java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at
java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
