java.lang.NullPointerException

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  • NPE when adding combobox selection to my jList
    via by Sean Gomes,
    • java.lang.NullPointerException at AcHandler.actionPerformed(AcHandler.java:19) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:2028) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2351) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.Component.processMouseEvent(Component.java:6382) at javax.swing.JComponent.processMouseEvent(JComponent.java:3275) at java.awt.Component.processEvent(Component.java:6147) at java.awt.Container.processEvent(Container.java:2083) at java.awt.Component.dispatchEventImpl(Component.java:4744) at java.awt.Container.dispatchEventImpl(Container.java:2141) at java.awt.Component.dispatchEvent(Component.java:4572) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4619) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4280) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4210) at java.awt.Container.dispatchEventImpl(Container.java:2127) at java.awt.Window.dispatchEventImpl(Window.java:2489) at java.awt.Component.dispatchEvent(Component.java:4572) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:710) at java.awt.EventQueue.access$400(EventQueue.java:82) at java.awt.EventQueue$2.run(EventQueue.java:669) at java.awt.EventQueue$2.run(EventQueue.java:667) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$3.run(EventQueue.java:683) at java.awt.EventQueue$3.run(EventQueue.java:681) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:680) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:296) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:211) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:201) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:196) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:188) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
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