Hello, I have got an issue with the KnowledgeAgent that seems not to survive a Guvnor restart. The scenario is as follows: * We use Drools 5.0 * On our application server we create a KnowledgeAgent applying a ChangeSet that points to a package binary on a separate Guvnor server like so: SystemEventListenerFactory.setSystemEventListener(new SystemEventLogger()); ResourceFactory.getResourceChangeNotifierService().start(); ResourceFactory.getResourceChangeScannerService().start(); KnowledgeAgent agent = KnowledgeAgentFactory.newKnowledgeAgent(workflowName); agent.applyChangeSet(changeSet); * Creating the kbase, registering globals and running sessions works fine. * We shut down Guvnor (or the connection goes down, this was how we spotted the problem) and restart it after a minute * We then try to run sessions from the same agent as above via kagent.getKnowledgeBase().newStatefulKnowledgeSession(); which returns a ksession, but then setting a global we get java.lang.RuntimeException: Unexpected global [log] at org.drools.common.AbstractWorkingMemory.setGlobal(AbstractWorkingMemory.java:5 50) at org.drools.impl.StatefulKnowledgeSessionImpl.setGlobal(StatefulKnowledgeSessio nImpl.java:284) SystemEventLogger indicates that the KnowledgeAgent unsubscribes from its resource when Guvnor is down and rebuilds its kbase. Also, it stops scanning the resource and does not find it once Guvnor is up again. (See log snippet below). Wouldn't it be better in these cases to keep the resource as is in memory and try to rescan? I figure that as long as the resource is specified in the changeSet it should be considered part of the kbase and not be removed if it cannot be found. For the time being, does anyone have a suggestion how to avoid these problems? We could catch the RuntimeException and recreate the KnowledgeAgent, but perhaps there is a better way? Thanks, Gerret -- SystemEventLog -- # Guvnor is up here 07:58:01,881 ResourceChangeScanner attempt to scan 1 resources 07:58:02,209 ResourceChangeScanner thread is waiting for 60 07:58:15,067 ResourceChangeScanner attempt to scan 1 resources # Guvnor goes down here 07:58:16,738 ResourceChangeScanner removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification received ChangeSet notification 07:58:16,738 ResourceChangeScanner thread is waiting for 60 07:58:16,738 ResourceChangeNotification processing ChangeSet 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@1053d6d 07:58:16,738 ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@b71c17 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgeAgent received ChangeSet changed notification 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 ResourceChangeNotification thread is waiting for queue update 07:58:16,738 KnowledgAgent applying ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@1053d6d to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@b71c17 to resource=[UrlResource path='http://localhost:7080/drools- guvnor/org.drools.guvnor.Guvnor/package/com.foo.bar/LATEST'] 07:58:16,738 KnowledgeAgent rebuilding KnowledgeBase using ChangeSet 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:58:16,738 KnowledgeAgent new KnowledgeBase now built and in use 07:59:02,202 ResourceChangeScanner attempt to scan 0 resources 07:59:02,202 ResourceChangeScanner thread is waiting for 60 # Guvnor back up here 07:59:16,731 ResourceChangeScanner attempt to scan 0 resources 07:59:16,731 ResourceChangeScanner thread is waiting for 60