Estou tentando executar uma tela que criei no NetBeans (Shift+F6) e o resultado é:
init:
deps-jar:
Compiling 1 source file to C:\java\Início\build\classes
compile-single:
run-single:
Exception in thread “AWT-EventQueue-0” java.lang.NullPointerException
at java.util.Hashtable.get(Hashtable.java:336)
at javax.swing.KeyboardManager.registerMenuBar(KeyboardManager.java:263)
at javax.swing.JMenuBar.addNotify(JMenuBar.java:679)
at java.awt.Container.addNotify(Container.java:2500)
at javax.swing.JComponent.addNotify(JComponent.java:4478)
at java.awt.Container.addNotify(Container.java:2500)
at javax.swing.JComponent.addNotify(JComponent.java:4478)
at javax.swing.JRootPane.addNotify(JRootPane.java:680)
at java.awt.Container.addNotify(Container.java:2500)
at java.awt.Window.addNotify(Window.java:467)
at java.awt.Frame.addNotify(Frame.java:501)
at java.awt.Window.show(Window.java:514)
at java.awt.Component.show(Component.java:1302)
at java.awt.Component.setVisible(Component.java:1255)
at Principal$2.run(Principal.java:74)
at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209)
at java.awt.EventQueue.dispatchEvent(EventQueue.java:461)
at java.awt.EventDispatchThread.pumpOneEventForHierarchy(EventDispatchThread.java:242)
at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:163)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:157)
at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:149)
at java.awt.EventDispatchThread.run(EventDispatchThread.java:110)
Nem sei por onde começar. Sou novo no assunto e não tenho experiência com Java. O que faço???
