Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException

[Cryslonger]

在做一个C/S聊天窗口界面，用netbeans的swing拖的窗口，加了个buttonActionPerformer后，点击按钮发生异常：
Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
at myserver.myserver.jButton8MouseClicked(myserver.java:163)
at myserver.myserver.access$000(myserver.java:12)
at myserver.myserver$1.mouseClicked(myserver.java:87)
at java.awt.AWTEventMulticaster.mouseClicked(AWTEventMulticaster.java:253)
at java.awt.Component.processMouseEvent(Component.java:6270)
at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
at java.awt.Component.processEvent(Component.java:6032)
at java.awt.Container.processEvent(Container.java:2041)
at java.awt.Component.dispatchEventImpl(Component.java:4630)
at java.awt.Container.dispatchEventImpl(Container.java:2099)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4247)
at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
at java.awt.Container.dispatchEventImpl(Container.java:2085)
at java.awt.Window.dispatchEventImpl(Window.java:2478)
at java.awt.Component.dispatchEvent(Component.java:4460)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:599)
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)

private void jButton8ActionPerformed(java.awt.event.ActionEvent evt) {

String info = textField1.getText();//从textfield读你所打的数据
if(info != null){
pw.println(info); //info写入pw,用来把pw的内容传给socket
textField1.setText("");}
else{
info = "";
}

}

[kebin0001]

myserver.myserver.jButton8MouseClicked(myserver.java:163)

myserver.java 的 163 行
通常 NullPointerException 事發生在物件本生是null，然後你又使用他的method。
所以163行應該你使用了某個物件的method，但那個物件是null。

[kai27ks]

textField1 初始化了没？

[qingyuan18]

单步，单步啊，楼主

空指针这种问题都是基本的调试就可以消除的，唉