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java.lang.NullPointerException: 	at ClassA.ClassA.(ClassA.java:45)	at ClassA.MainNullLayout.StartingServer(MainNullLayout.java:317)	at ClassA.MainNullLayout.jButton2ActionPerformed(MainNullLayout.java:263)	at ClassA.MainNullLayout.access$200(MainNullLayout.java:24)	at ClassA.MainNullLayout$3.actionPerformed(MainNullLayout.java:216)	at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1450)	at javax.swing.AbstractButton$ForwardActionEvents.actionPerformed(AbstractButton.java:1504)	at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:378)	at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:250)	at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:216)	at java.awt.Component.processMouseEvent(Component.java:3717)	at java.awt.Component.processEvent(Component.java:3546)	at java.awt.Container.processEvent(Container.java:1164)	at java.awt.Component.dispatchEventImpl(Component.java:2595)	at java.awt.Container.dispatchEventImpl(Container.java:1213)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:2451)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:2216)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:2125)	at java.awt.Container.dispatchEventImpl(Container.java:1200)	at java.awt.Window.dispatchEventImpl(Window.java:912)	at java.awt.Component.dispatchEvent(Component.java:2499)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:319)	at java.awt.EventDispatchThread.pumpOneEvent(EventDispatchThread.java:103)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:84)