Re: [Repast-interest] cay for help (my agent cann't move)

[Richard O. L. <rle...@ai...>]

Hi Yang,

Probably the solution is in this line:

Caused by: java.lang.NullPointerException
  at moveagent.People.step(People.java:31)

It is hard to tell which is line 31 based on what you attached, but I 
guess either the projection or the space query results in a /null/. 
Please double check if they are spelled properly and identical to what 
you defined.

Best,
Richard

--
Richard O. Legendi
Software developer
Intelligent Applications and Web Services
AITIA International, Inc.
http://people.inf.elte.hu/legendi/

On 2012.07.30. 12:41, yang chen wrote:
> Hi:
>     i design a very simple modle.just people as agents walk in the 
> grid.i can initial my modle successfully,but when i run my 
> modle,agents cann't move.(Tick can move). i donn't know why.and i have 
> think for 2 days.so please help me.
> error log as follows:
> 2012/07/30 11:07:00,116: Tried to call: public void 
> moveagent.People.step()
> java.lang.reflect.InvocationTargetException
>  at moveagent.People$$FastClassByCGLIB$$418e0c09.invoke(<generated>)
>  at net.sf.cglib.reflect.FastMethod.invoke(FastMethod.java:53)
>  at 
> repast.simphony.engine.schedule.DynamicTargetAction.execute(DynamicTargetAction.java:69)
>  at 
> repast.simphony.engine.controller.ScheduledMethodControllerAction$ScheduleMethodAction.execute(ScheduledMethodControllerAction.java:216)
>  at 
> repast.simphony.engine.schedule.DefaultAction.execute(DefaultAction.java:38)
>  at 
> repast.simphony.engine.schedule.ScheduleGroup.executeList(ScheduleGroup.java:184)
>  at 
> repast.simphony.engine.schedule.ScheduleGroup.execute(ScheduleGroup.java:201)
>  at repast.simphony.engine.schedule.Schedule.execute(Schedule.java:352)
>  at 
> repast.simphony.ui.GUIScheduleRunner$ScheduleLoopRunnable.run(GUIScheduleRunner.java:53)
>  at java.lang.Thread.run(Unknown Source)
> Caused by: java.lang.NullPointerException
>  at moveagent.People.step(People.java:31)
>  ... 10 more
> peoples codes as follows:
> public class People {
>  public double heading;
>
>  public People(double heading) {
>   this.heading=heading ;
>  }
>  @ScheduledMethod(start = 1, interval = 1)
>  public void step() {
>   Context cdcontext = ContextUtils.getContext(this);
>   Grid grid = (Grid) cdcontext.getProjection("Simple Grid");
>   ContinuousSpace cdspace = (ContinuousSpace) 
> cdcontext.getProjection("Continuou Space");
>   NdPoint point = cdspace.getLocation(this);
>   double x = point.getX();
>   double y = point.getY();
>   if (Math.random() > 0.5)
>    heading = heading + Math.random() * 50;
>   else
>    heading = heading - Math.random() * 50;
>
>   cdspace.moveByVector(this, 1, Math.toRadians(heading), 0,0);
>   grid.moveTo(this, (int) x, (int)y);
>
>  }
> }
>
> thank you!
>
>
>
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