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tfrady 04-20-2018 09:51 AM

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)

chickentree 04-23-2018 03:15 PM

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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