我做了一个cs结构的聊天程序，用了swing，hibernate。可是有时候会出现会出现下列异常，它也没说我程序的哪行出错， 我该怎么找错误啊。什么原因可能导致不报异常位置。 哪位仁兄帮帮忙，都困扰我好几天了。 Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException at javax.swing.plaf.basic.BasicTreeUI.paint(BasicTreeUI.java:1140) at javax.swing.plaf.metal.MetalTreeUI.paint(MetalTreeUI.java:152) 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:285) at javax.swing.RepaintManager.paint(RepaintManager.java:1128) at javax.swing.JComponent._paintImmediately(JComponent.java:5070) at javax.swing.JComponent.paintImmediately(JComponent.java:4880) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:723) at javax.swing.RepaintManager.paintDirtyRegions(RepaintManager.java:679) at javax.swing.RepaintManager.seqPaintDirtyRegions(RepaintManager.java:659) 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:273) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:183) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:173) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:168) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:160) at java.awt.EventDispatchThread.run(EventDispatchThread.java:121)
楼主该结一些帖子了
