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The DatabaseIdGenerator need second commandService to fetch the id from database in a seperated Transaction, please refer jbpm.default.cfg.xml
<object class='org.jbpm.pvm.internal.id.DatabaseDbidGenerator'> <field name="commandService"><ref object="newTxRequiredCommandService" /></field> </object>
I didn't know anything about the third commandService, maybe it is an out of date configuration.