Get the list of processes started by a specific user

I want to get the list of processes started by a specific user
(requester). This is the code:

String login = "admin";
WfProcessMgr processMgr;
...
WfProcessIterator iter = processMgr.get_iterator_process();
iter.set_query_expression("requesterId.equals(\"" + login + "\")");
WfProcess[] processes = iter.get_next_n_sequence(0);

The last instruction rises an exception:

2005-06-21 08:55:08,640: BshEvaluator -> The result of expression
requesterId.equals("admin") can't be evaluated - error message=Sourced
file: <Inline eval of:requesterId.equals("admin"); > : Null Pointer in
Method Invocation

On the other hand, if I remove the "set_query_expression" instruction,
there's no exception. Even, if I change the query expression:
"state.equals(...)" there's no exception.

I'm using the last version of engine and API: shark1.1.

What's the problem?

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