My scenario is a rule that is firing over a collection. For each item in that collection a ruleflow starts to handle it. Right now the ruleflow just uses the log workitem to log the steps. When there are ~600 items in the collection I'm getting stack overflows. Granted the processes could be optimized (I'd really like to take each thing in the collection that matched and start a process for the set of them). Still is there a limit to the number of active processes with work items? java.lang.StackOverflowError at java.lang.Long.valueOf(Long.java:547) at org .drools .workflow.core.impl.NodeContainerImpl.getNode(NodeContainerImpl.java:44) at org .drools .workflow .core.impl.WorkflowProcessImpl.getNode(WorkflowProcessImpl.java:47) at org .drools .workflow .core .impl.WorkflowProcessImpl.internalGetNode(WorkflowProcessImpl.java:51) at org .drools .workflow.instance.impl.NodeInstanceImpl.getNode(NodeInstanceImpl.java: 90) at org .drools .workflow .instance .impl .ExtendedNodeInstanceImpl .getExtendedNode(ExtendedNodeInstanceImpl.java:24) at org .drools .workflow .instance .impl .ExtendedNodeInstanceImpl.triggerEvent(ExtendedNodeInstanceImpl.java:41) at org .drools .workflow .instance .impl .ExtendedNodeInstanceImpl .internalTrigger(ExtendedNodeInstanceImpl.java:28) at org .drools .workflow .instance .node .EventBasedNodeInstance.internalTrigger(EventBasedNodeInstance.java:30) at org .drools .workflow .instance .node.WorkItemNodeInstance.internalTrigger(WorkItemNodeInstance.java:80) at org .drools .workflow.instance.impl.NodeInstanceImpl.trigger(NodeInstanceImpl.java: 111) at org .drools .workflow .instance .impl.NodeInstanceImpl.triggerConnection(NodeInstanceImpl.java:141) at org .drools .workflow .instance.impl.NodeInstanceImpl.triggerCompleted(NodeInstanceImpl.java: 128) at org .drools .workflow .instance .impl .ExtendedNodeInstanceImpl .triggerCompleted(ExtendedNodeInstanceImpl.java:37) at org .drools .workflow .instance .node .EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:96) at org .drools .workflow .instance .node .EventBasedNodeInstance.triggerCompleted(EventBasedNodeInstance.java:77) at org .drools .workflow .instance .node.WorkItemNodeInstance.triggerCompleted(WorkItemNodeInstance.java: 192) at org .drools .workflow .instance .node.WorkItemNodeInstance.workItemCompleted(WorkItemNodeInstance.java: 244) at org .drools .workflow .instance .node.WorkItemNodeInstance.signalEvent(WorkItemNodeInstance.java:222) at org .drools .workflow .instance .impl .WorkflowProcessInstanceImpl .signalEvent(WorkflowProcessInstanceImpl.java:258) at org .drools .process .instance .impl .DefaultWorkItemManager.completeWorkItem(DefaultWorkItemManager.java:96) at com.jsi.inactivity.DroolsTest$1.executeWorkItem(DroolsTest.java:40)