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java.lang.NullPointerException: 	at javax.swing.LayoutComparator.compare(Unknown Source)	at java.util.Collections.indexedBinarySearch(Unknown Source)	at java.util.Collections.binarySearch(Unknown Source)	at javax.swing.SortingFocusTraversalPolicy.getComponentAfter(Unknown Source)	at javax.swing.LayoutFocusTraversalPolicy.getComponentAfter(Unknown Source)	at java.awt.Component.nextFocusHelper(Unknown Source)	at java.awt.Container.nextFocusHelper(Unknown Source)	at java.awt.Component.nextFocus(Unknown Source)	at java.awt.Component.transferFocus(Unknown Source)	at oracle.ewt.lwAWT.LWComponent.processFocusEvent(Unknown Source)	at oracle.ewt.lwAWT.AbstractButton.processFocusEvent(Unknown Source)	at oracle.ewt.button.PushButton.processFocusEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.processEvent(Unknown Source)	at oracle.ewt.lwAWT.LWComponent.processEventImpl(Unknown Source)	at oracle.ewt.button.PushButton.processEventImpl(Unknown Source)	at oracle.ewt.lwAWT.LWComponent.redispatchEvent(Unknown Source)	at oracle.ewt.lwAWT.LWComponent.processEvent(Unknown Source)	at java.awt.Component.dispatchEventImpl(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.KeyboardFocusManager.redispatchEvent(Unknown Source)