list shuffler (java)

[Matteo Richiardi]

dear list members,

i have a problem with the list shuffler, in a java application.

 

My code goes like this:

 

*** CODE STARTS HERE ***

import swarm.collections.ListImpl;
import swarm.collections.ListShufflerImpl;

private ListShufflerImpl listShuffler;

  listShuffler.shuffleWholeList((ListImpl) agentList);

*** CODE ENDS HERE ***

 

where agentList is a define list of agents.

 

I get this error msg:

 

*** ERROR MSG STARTS HERE ***

$ jdkswarm StartFirms
*** event raised for error: InvalidArgument
*** function: nil_method(), file: /src/Swarm/swarm/src/defobj/internal.m, line:

637
The message `shuffleWholeList:' was sent to nil.
*** execution terminating due to error
/src/Swarm/swarm/src/defobj/Symbol.m:173 -[Error(c) _raiseEvent:]

         0 [sig] java 1612895 open_stackdumpfile: Dumping stack trace to JAVA.EXE.s
tackdump
Signal 6
*** ERROR MSG ENDS HERE ***

 

 

I also tried simply with 
  listShuffler.shuffleWholeList(agentList)

but it did not work either.

 

Any suggestion ?

 

Many thanks in advance,

 

Matteo Richiardi

(Torino, Italy)