Java 从另一个线程执行swing刷新时出错
我有一个刷新按钮,它使用另一个线程用更新的数据重新加载JTable。虽然数据正在更新,但在控制台上我可以看到一个空指针异常,如下所示:Java 从另一个线程执行swing刷新时出错,java,multithreading,swing,nullpointerexception,jtable,Java,Multithreading,Swing,Nullpointerexception,Jtable,我有一个刷新按钮,它使用另一个线程用更新的数据重新加载JTable。虽然数据正在更新,但在控制台上我可以看到一个空指针异常,如下所示: Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.plaf.basic.BasicScrollBarUI.layoutVScrollbar(BasicScrollBarUI.java:657) at javax.swing.pl
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicScrollBarUI.layoutVScrollbar(BasicScrollBarUI.java:657)
at javax.swing.plaf.basic.BasicScrollBarUI.layoutContainer(BasicScrollBarUI.java:862)
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.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.pumpEventsForFilter(EventDispatchThread.java:121)
at java.awt.WaitDispatchSupport$2.run(WaitDispatchSupport.java:182)
at java.awt.WaitDispatchSupport$4.run(WaitDispatchSupport.java:221)
at java.security.AccessController.doPrivileged(Native Method)
at java.awt.WaitDispatchSupport.enter(WaitDispatchSupport.java:219)
at java.awt.Dialog.show(Dialog.java:1072)
at java.awt.Component.show(Component.java:1650)
at java.awt.Component.setVisible(Component.java:1602)
at java.awt.Window.setVisible(Window.java:1013)
at java.awt.Dialog.setVisible(Dialog.java:1003)
at in.tcs.dct.ui.dialogs.ResultDialog.<init>(ResultDialog.java:170)
at in.tcs.dct.ui.panels.AutoRefreshThread$1.mouseClicked(DashboardPanel.java:1083)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:270)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:269)
at java.awt.Component.processMouseEvent(Component.java:6507)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3321)
at java.awt.Component.processEvent(Component.java:6269)
at java.awt.Container.processEvent(Container.java:2229)
at java.awt.Component.dispatchEventImpl(Component.java:4860)
at java.awt.Container.dispatchEventImpl(Container.java:2287)
at java.awt.Component.dispatchEvent(Component.java:4686)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4832)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4501)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
at java.awt.Container.dispatchEventImpl(Container.java:2273)
at java.awt.Window.dispatchEventImpl(Window.java:2713)
at java.awt.Component.dispatchEvent(Component.java:4686)
at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
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.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
at java.awt.EventQueue$4.run(EventQueue.java:680)
at java.awt.EventQueue$4.run(EventQueue.java:678)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:128)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:117)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
线程“AWT-EventQueue-0”java.lang.NullPointerException中的异常
位于javax.swing.plaf.basic.BasicScrollBarUI.layoutVScrollbar(BasicScrollBarUI.java:657)
位于javax.swing.plaf.basic.BasicScrollBarUI.layoutContainer(BasicScrollBarUI.java:862)
位于java.awt.Container.layout(Container.java:1503)
位于java.awt.Container.doLayout(Container.java:1492)
位于java.awt.Container.validateTree(Container.java:1688)
位于java.awt.Container.validateTree(Container.java:1697)
位于java.awt.Container.validate(Container.java:1623)
位于javax.swing.RepainManager.validateInvalidComponents(RepainManager.java:653)
在javax.swing.repaitmanager$ProcessingRunnable.run(repaitmanager.java:1620)
在java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:251)中
位于java.awt.EventQueue.dispatchEventImpl(EventQueue.java:705)
在java.awt.EventQueue.access$000(EventQueue.java:101)
在java.awt.EventQueue$3.run(EventQueue.java:666)
在java.awt.EventQueue$3.run(EventQueue.java:664)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:675)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
位于java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:128)
位于java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:121)
WaitDispatchSupport$2.run(WaitDispatchSupport.java:182)
WaitDispatchSupport$4.run(WaitDispatchSupport.java:221)
位于java.security.AccessController.doPrivileged(本机方法)
在java.awt.WaitDispatchSupport.enter中输入(WaitDispatchSupport.java:219)
在java.awt.Dialog.show(Dialog.java:1072)
在java.awt.Component.show(Component.java:1650)
位于java.awt.Component.setVisible(Component.java:1602)
位于java.awt.Window.setVisible(Window.java:1013)
位于java.awt.Dialog.setVisible(Dialog.java:1003)
在in.tcs.dct.ui.dialogs.ResultDialog.(ResultDialog.java:170)
在in.tcs.dct.ui.panels.autorefreshread$1.mouseClicked(DashboardPanel.java:1083)中
在java.awt.AWTEventMulticaster.mouseClicked处(AWTEventMulticaster.java:270)
在java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:269)
位于java.awt.Component.ProcessMouseeEvent(Component.java:6507)
位于javax.swing.JComponent.ProcessMouseeEvent(JComponent.java:3321)
位于java.awt.Component.processEvent(Component.java:6269)
位于java.awt.Container.processEvent(Container.java:2229)
位于java.awt.Component.dispatchEventImpl(Component.java:4860)
位于java.awt.Container.dispatchEventImpl(Container.java:2287)
位于java.awt.Component.dispatchEvent(Component.java:4686)
位于java.awt.LightweightDispatcher.RetargetMouseeEvent(Container.java:4832)
位于java.awt.LightweightDispatcher.ProcessMouseeEvent(Container.java:4501)
位于java.awt.LightweightDispatcher.dispatchEvent(Container.java:4422)
位于java.awt.Container.dispatchEventImpl(Container.java:2273)
位于java.awt.Window.dispatchEventImpl(Window.java:2713)
位于java.awt.Component.dispatchEvent(Component.java:4686)
位于java.awt.EventQueue.dispatchEventImpl(EventQueue.java:707)
在java.awt.EventQueue.access$000(EventQueue.java:101)
在java.awt.EventQueue$3.run(EventQueue.java:666)
在java.awt.EventQueue$3.run(EventQueue.java:664)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:87)
在java.awt.EventQueue$4.run(EventQueue.java:680)
在java.awt.EventQueue$4.run(EventQueue.java:678)
位于java.security.AccessController.doPrivileged(本机方法)
位于java.security.ProtectionDomain$1.doIntersectionPrivilege(ProtectionDomain.java:76)
位于java.awt.EventQueue.dispatchEvent(EventQueue.java:677)
位于java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:211)
位于java.awt.EventDispatchThread.PumpeEventsforFilter(EventDispatchThread.java:128)
位于java.awt.EventDispatchThread.PumpeEventsforHierarchy(EventDispatchThread.java:117)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:113)
位于java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:105)
在java.awt.EventDispatchThread.run(EventDispatchThread.java:90)
如果有人能帮忙
Swing事件处理代码在称为事件分派线程的特殊线程上运行。大多数调用Swing方法的代码也在此线程上运行。这是必要的,因为大多数Swing对象方法都不是“线程安全的”:从多个线程调用它们可能会导致线程干扰或内存一致性错误
因此,您不能从手动创建的线程调用框架中的方法。要在事件分派线程中调用代码片段,请使用SwingUtilities.invokeLater
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