[kepler-users] Save/Load XML file

[Chad Berkley]

Hi Guillaume,

Could you turn on debug mode so you can see the source of the NPE?  If 
you are using ant to compile kepler, the debug mode should already be 
turned on.  If you're using javac to compile your code separately, you 
need to use the -g flag to turn on debugging.  This will give you the 
line number where the NPE is thrown and make it easier to figure out 
what is going on (so you don't get "Unknown Source" in the stack trace).

My initial hunch is that a parameter or attribute is getting created the 
first time, but not on the 2nd run for some reason.  This happens 
sometimes in kepler when you try to create an attribute with the same 
name as one that exists and don't check for it existing.  Technically 
what should happen is that a NameDuplicationException should be thrown, 
but I've seen the behavior you describe also.

chad


tog wrote:
> Dear all,
> 
> I have the following error when trying to re-execute a workflow:
> 
> java.lang.NullPointerException
> 	at org.gridle.plugin.kepler.component.OutputPlug.fire(Unknown Source)
> 	at ptolemy.actor.AtomicActor.iterate(AtomicActor.java:398)
> 	at ptolemy.actor.sched.StaticSchedulingDirector.fire(StaticSchedulingDirector.java:170)
> 	at ptolemy.actor.CompositeActor.fire(CompositeActor.java:400)
> 	at ptolemy.actor.Manager.iterate(Manager.java:688)
> 	at ptolemy.actor.Manager.execute(Manager.java:332)
> 	at ptolemy.actor.Manager.run(Manager.java:1071)
> 	at ptolemy.actor.Manager$3.run(Manager.java:1112)
> 
> What I did is the following:
> 
>   1- design a workflow
>   2- run it
>   3- save as file
> 
>   4 - restart Kepler
>   5- reload XML
>   6- run
> 
> What could be my mistake ?
> 
> Best Regards
> Guillaume
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