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via Coderanch by Vazzdoin Rocko, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at test.piano.mousePressed(piano.java:69)	at java.awt.AWTEventMulticaster.mousePressed(AWTEventMulticaster.java:280)	at java.awt.Component.processMouseEvent(Component.java:6104)	at javax.swing.JComponent.processMouseEvent(JComponent.java:3287)	at java.awt.Component.processEvent(Component.java:5872)	at java.awt.Container.processEvent(Container.java:2101)	at java.awt.Component.dispatchEventImpl(Component.java:4467)	at java.awt.Container.dispatchEventImpl(Container.java:2159)	at java.awt.Component.dispatchEvent(Component.java:4293)	at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4578)	at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)	at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4171)	at java.awt.Container.dispatchEventImpl(Container.java:2145)	at java.awt.Window.dispatchEventImpl(Window.java:2559)	at java.awt.Component.dispatchEvent(Component.java:4293)	at java.awt.EventQueue.dispatchEvent(EventQueue.java:604)	at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:275)	at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:200)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:190)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:185)	at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:177)	at java.awt.EventDispatchThread.run(EventDispatchThread.java:138)