Exception in thread "AWT-EventQueue-0" java.lang.NullPointerException
        at Server$action.mousePressed(Server1.java:106)
        at java.awt.AWTEventMulticaster.mousePressed(Unknown Source)
        at java.(Unknown Source)
        at javax.swing.JComponent.processMouseEvent(Unknown Source)
        at java.(Unknown Source)
        at java.awt.Container.processEvent(Unknown Source)
        at java.(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.(Unknown Source)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)
        at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)
        at java.awt.Container.dispatchEventImpl(Unknown Source)
        at java.awt.Window.dispatchEventImpl(Unknown Source)
        at java.(Unknown Source)
        at java.awt.EventQueue.dispatchEvent(Unknown Source)
        at java.awt.EventDispatchThread.pumpOneEventForHierarchy(Unknown Source)

        at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.pumpEvents(Unknown Source)
        at java.awt.EventDispatchThread.run(Unknown Source)

空指针异常