[kepler-dev] Possible bug: variable name must equal MoML name

[xiaowen]

Hi,

In the process of writing an actor, Ilkay and I encountered a possible 
bug in the implementation of the code that allows instantiation of a 
class in the workflow.

Attached are the workflow and the actor that demonstrates this problem.

In the attached actor code, there's a port that's instantiated as:

inputo = new TypedIOPort(this, "input", true, false);


So the variable name is "inputo", but it is named "input" in the MoML.

When I run this workflow, I get:



Exception in thread ".np.InstanceOfClass2.NameProblem" 
java.lang.RuntimeException: java.lang.NullPointerException
        at 
ptolemy.actor.process.ProcessThread.run(ProcessThread.java:219)
Caused by: java.lang.NullPointerException
        at NameProblem.fire(NameProblem.java:28)
        at 
ptolemy.actor.process.ProcessThread.run(ProcessThread.java:181)
Exception in thread ".np.InstanceOfClass.NameProblem" 
java.lang.RuntimeException: java.lang.NullPointerException
        at 
ptolemy.actor.process.ProcessThread.run(ProcessThread.java:219)
Caused by: java.lang.NullPointerException
        at NameProblem.fire(NameProblem.java:28)
        at 
ptolemy.actor.process.ProcessThread.run(ProcessThread.java:181)


However, interestingly enough, if I rename the variable to "input", and 
thus match the MoML name, there's no exception.

So somehow, the workflow only runs if the variable name is the same as 
the MoML name.

Is this a bug in Ptolemy or is something missing in my understanding of 
writing actors?


Thanks in advance for the help!
Xiaowen



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