java.lang.NullPointerException at javax.swing.plaf.basic.BasicScrollPaneUI$Handler.mouseWheelMoved(BasicScrollPaneUI.java:866) at org.netbeans.modules.editor.lib2.view.DocumentViewOp.mouseWheelMoved(DocumentViewOp.java:1523) at org.netbeans.modules.editor.lib2.view.DocumentViewOp$MouseWheelDelegator.mouseWheelMoved(DocumentViewOp.java:1657) at java.awt.AWTEventMulticaster.mouseWheelMoved(AWTEventMulticaster.java:532) at java.awt.Component.processMouseWheelEvent(Component.java:6621) at java.awt.Component.processEvent(Component.java:6305) at java.awt.Container.processEvent(Container.java:2237) at java.awt.Component.dispatchEventImpl(Component.java:4889) at java.awt.Container.dispatchEventToSelf(Container.java:2319) at java.awt.Component.dispatchMouseWheelToAncestor(Component.java:5042) at java.awt.Component.dispatchEventImpl(Component.java:4776) at java.awt.Container.dispatchEventImpl(Container.java:2295) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.LightweightDispatcher.retargetMouseEvent(LightweightDispatcher.java:4889) at java.awt.LightweightDispatcher.processMouseEvent(LightweightDispatcher.java:4555) at java.awt.LightweightDispatcher.dispatchEvent(LightweightDispatcher.java:4467) at java.awt.Container.dispatchEventImpl(Container.java:2281) at java.awt.Window.dispatchEventImpl(Window.java:2746) at java.awt.Component.dispatchEvent(Component.java:4711) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:760) at java.awt.EventQueue.access$500(EventQueue.java:97) at java.awt.EventQueue$3.run(EventQueue.java:709) at java.awt.EventQueue$3.run(EventQueue.java:703) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:90) at java.awt.EventQueue$4.run(EventQueue.java:733) at java.awt.EventQueue$4.run(EventQueue.java:731) at java.security.AccessController.doPrivileged(AccessController.java:0) at java.security.ProtectionDomain$JavaSecurityAccessImpl.doIntersectionPrivilege(ProtectionDomain.java:80) at java.awt.EventQueue.dispatchEvent(EventQueue.java:730) at org.netbeans.core.TimableEventQueue.dispatchEvent(TimableEventQueue.java:159) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:205) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:116) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:105) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:101) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:93) at java.awt.EventDispatchThread.run(EventDispatchThread.java:82)