As I understand there are 2 bugs which affect your problem. The problem wtih the engine
which Joram mentioned in one of the comments here:
https://jira.jboss.org/jira/browse/JBPM-2544
Seems to be a a rather small change in the code. So you could get the 4.1 sources, make
this change manually since you do not want the other changes which are in trunk and
afterwards build from source.
As Joram mentioned this should make the exception gone away but as long as you do not
update to console 1.2 you won't be able to see the process instances and tasks.
Regarding your deadline: I saw the date somehere, 4.2 is supposed to be released on
November 1st I think.
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