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    Thrown when an application is trying to use or access an object whose reference equals to null. You are probably trying to use a reference that points to no location in memory as though it were referencing an object.

Solutions on the web

via robocode by *anonymous
, 1 year ago
This exception has no message.
via Atlassian JIRA by Peter Hanraets, 1 year ago
This exception has no message.
via Atlassian JIRA by Peter Hanraets, 1 year ago
This exception has no message.
via Google Groups by Vash, 8 months ago
via apache.org by Unknown author, 1 year ago
This exception has no message.
via JIRA by Jim Procter, 2 years ago
java.lang.NullPointerException: 	at java.util.Hashtable.put(Unknown Source)	at java.util.Properties.setProperty(Unknown Source)	at robocode.manager.RobocodeProperties.store(Unknown Source)	at robocode.manager.RobocodeManager.saveProperties(Unknown Source)	at robocode.dialog.PreferencesViewOptionsTab.storePreferences(Unknown Source)	at robocode.dialog.PreferencesDialog.finishButtonActionPerformed(Unknown Source)	at robocode.dialog.WizardController.finishButtonActionPerformed(UnknownSource)	at robocode.dialog.WizardController.access$100(Unknown Source)	at robocode.dialog.WizardController$EventHandler.actionPerformed(Unknown Source)	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.plaf.basic.BasicButtonListener.mouseReleased(Unknown Source)	at java.awt.Component.processMouseEvent(Unknown Source)	at javax.swing.JComponent.processMouseEvent(Unknown Source)	at java.awt.Component.processEvent(Unknown Source)	at java.awt.Container.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.LightweightDispatcher.retargetMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.processMouseEvent(Unknown Source)	at java.awt.LightweightDispatcher.dispatchEvent(Unknown Source)	at java.awt.Container.dispatchEventImpl(Unknown Source)	at java.awt.Window.dispatchEventImpl(Unknown Source)	at java.awt.Component.dispatchEvent(Unknown Source)	at java.awt.EventQueue.dispatchEvent(Unknown Source)	at java.awt.EventDispatchThread.pumpOneEventForFilters(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForFilter(Unknown Source)	at java.awt.EventDispatchThread.pumpEventsForHierarchy(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)	at java.awt.EventDispatchThread.pumpEvents(Unknown Source)