Question

java 异常 如下，请高手指教

Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at javax.swing.plaf.basic.BasicScrollPaneUI.paint(BasicScrollPaneUI.java:90)
at javax.swing.plaf.ComponentUI.update(ComponentUI.java:143)
at javax.swing.JComponent.paintComponent(JComponent.java:763)
at javax.swing.JComponent.paint(JComponent.java:1027)
at javax.swing.JComponent.paintToOffscreen(JComponent.java:5122)
at javax.swing.BufferStrategyPaintManager.paint(BufferStrategyPaintManager.java:277)
at javax.swing.RepaintManager.paint(RepaintManager.java:1217)
at javax.swing.JComponent._paintImmediately(JComponent.java:5070)
at javax.swing.JComponent.paintImmediately(JComponent.java:4880)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:803)
at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:714)
at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:694)
at javax.swing.SystemEventQueueUtilities$ComponentWorkRequest.run(SystemEventQueueUtilities.java:128)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:597)
at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)

Answer 1

java.lang.NullPointerException

空指针异常。

应该是你使用的对象没有初始化。

"AWT-EventQueue-0"
这应该是发生在事件中。按钮事件等等。。。。

再详细的，就得需要你的代码了。

Answer 2

很明显、提示的意思是事件队列的某对象是空！空指针错误
先检查at javax.swing.plaf.basic.BasicScrollPaneUI.paint(BasicScrollPaneUI.java:90)
这个地方

Answer 3

空指针
你做的swing的东西吧，换一下jdk好像老版本的，会有这种问题发生

Answer 4

很明显，是空值，你应该找到空值的地方，加上判断

Answer 5

空指针异常，你查下你使用的数据是不是使用前没有判断非空这个情况if（value==null）｛处理非空的方法｝

Answer 6

你用线程没？用的话试试在那debug一下，跑一下流程看那没取到