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via Coderanch by Emili Calonge, 1 year ago
This exception has no message.
java.lang.NullPointerException: 	at grafic.Prueba.actionPerformed(	at javax.swing.AbstractButton.fireActionPerformed(Unknown Source)	at javax.swing.AbstractButton$Handler.actionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.fireActionPerformed(Unknown Source)	at javax.swing.DefaultButtonModel.setPressed(Unknown Source)	at javax.swing.AbstractButton.doClick(Unknown Source)	at javax.swing.plaf.basic.BasicMenuItemUI.doClick(Unknown Source)	at javax.swing.plaf.basic.BasicMenuItemUI$Handler.mouseReleased(Unknown Source)