What is wrong with this code?
Error during simulation.
Alice version: 2.4.3 os.name: Windows NT (unknown) os.version: 6.2 os.arch: x86 java.vm.name: Java HotSpot(TM) Client VM java.vm.version: 20.0-b11 user.dir: C:\Users\cj4337\Desktop\Alice 2.4\Required Throwable that caused the error: java.lang.NullPointerException at edu.cmu.cs.stage3.alice.core.response.CallToUserDefinedResponse$RuntimeCallToUserDefinedResponse.prologue(CallToUserDefinedResponse.java:53) at edu.cmu.cs.stage3.alice.core.behavior.AbstractConditionalBehavior.internalSchedule(AbstractConditionalBehavior.java:105) at edu.cmu.cs.stage3.alice.core.behavior.ConditionalBehavior.internalSchedule(ConditionalBehavior.java:42) at edu.cmu.cs.stage3.alice.core.Behavior.schedule(Behavior.java:235) at edu.cmu.cs.stage3.alice.core.Sandbox.scheduleBehaviors(Sandbox.java:70) at edu.cmu.cs.stage3.alice.core.World.scheduleBehaviors(World.java:457) at edu.cmu.cs.stage3.alice.core.World.schedule(World.java:499) at edu.cmu.cs.stage3.alice.core.clock.DefaultClock.schedule(DefaultClock.java:99) at edu.cmu.cs.stage3.alice.authoringtool.AuthoringTool$7.run(AuthoringTool.java:723) at edu.cmu.cs.stage3.alice.authoringtool.util.DefaultScheduler.simulateOnce(DefaultScheduler.java:117) at edu.cmu.cs.stage3.alice.authoringtool.util.DefaultScheduler.run(DefaultScheduler.java:78) at edu.cmu.cs.stage3.scheduler.AbstractScheduler.run(AbstractScheduler.java:45) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:209) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:641) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:602) at java.awt.EventQueue$1.run(EventQueue.java:600) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:611) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:178) at java.awt.Dialog$1.run(Dialog.java:1046) at java.awt.Dialog$3.run(Dialog.java:1098) at java.security.AccessController.doPrivileged(Native Method) at java.awt.Dialog.show(Dialog.java:1096) at java.awt.Component.show(Component.java:1584) at java.awt.Component.setVisible(Component.java:1536) at java.awt.Window.setVisible(Window.java:842) at java.awt.Dialog.setVisible(Dialog.java:986) at edu.cmu.cs.stage3.swing.DialogManager.showModalDialog(DialogManager.java:66) at edu.cmu.cs.stage3.swing.DialogManager.showDialog(DialogManager.java:136) at edu.cmu.cs.stage3.alice.authoringtool.AuthoringTool.play(AuthoringTool.java:5587) at edu.cmu.cs.stage3.alice.authoringtool.Actions$16.actionPerformed(Actions.java:181) at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995) at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318) at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387) at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242) at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236) at java.awt.AWTEventMulticaster.mouseReleased(AWTEventMulticaster.java:272) at java.awt.Component.processMouseEvent(Component.java:6288) at javax.swing.JComponent.processMouseEvent(JComponent.java:3267) at java.awt.Component.processEvent(Component.java:6053) at java.awt.Container.processEvent(Container.java:2041) at java.awt.Component.dispatchEventImpl(Component.java:4651) at java.awt.Container.dispatchEventImpl(Container.java:2099) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577) at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238) at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168) at java.awt.Container.dispatchEventImpl(Container.java:2085) at java.awt.Window.dispatchEventImpl(Window.java:2478) at java.awt.Component.dispatchEvent(Component.java:4481) at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:643) at java.awt.EventQueue.access$000(EventQueue.java:84) at java.awt.EventQueue$1.run(EventQueue.java:602) at java.awt.EventQueue$1.run(EventQueue.java:600) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:98) at java.awt.EventQueue$2.run(EventQueue.java:616) at java.awt.EventQueue$2.run(EventQueue.java:614) at java.security.AccessController.doPrivileged(Native Method) at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:87) at java.awt.EventQueue.dispatchEvent(EventQueue.java:613) at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269) at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184) at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169) at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161) at java.awt.EventDispatchThread.run(EventDispatchThread.java:122) |
I usually get something like this if I deleted an object but the object was used in an instruction within my program.
I am not positive but I think you will see an object's slot filled in with "None" if the object was removed. I believe deleted variables and parameters can also leave this type of problem behind. Mark |
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