Okay, thanks for all the hints. It was really due to a classpath problem.
Here's what I found:
Logging and using Tom's hint with the DBManager showed that there was a query for an
execution which did not exist anymore. Before the executing of the job (transition with
timer to task "escalation") there are 2 entries in the Execution Table. One is
"escalation.1" and the second is "escalation.1-timeout". After the
transition to "escalation" escalation.1-timeout gets deleted, execution.1 is
active again and when you try to complete the task "timeout" which is still in
the tasklist you get the Exception because the associated execution cannot be found.
(I did not post logs since there cannot be seen really a lot and they get very large with
a higher loglevel set.
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