We're using Drools 5.0.1.SNAPSHOT 26353:26357M in JBoss 4.2.3. We're still in UAT so we've got our rules in Guvnor so that the business analysts can deploy changes quickly, they create snapshots in Guvnor that are picked up by the application. The problem is that sometimes creating a snapshot in Guvnor means that the ResourceChangeScanner in the application removes the changeset for the rule package that has changed. Here is the changeset config: <change-set xmlns="http://drools.org/drools-5.0/change-set" xmlns:xs="http://www.w3.org/2001/XMLSchema-instance" xs:schemaLocation="http://drools.org/drools-5.0/change-set.xsd" > <add> <resource source="http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/cover/cover" type="PKG" /> <resource source="http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/question/question" type="PKG" /> <resource source="http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/referral/referral" type="PKG" /> <resource source="http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/validation/validation" type="PKG" /> </add> </change-set> These are picked up OK when the application starts (I've elided the timestamps from the log file entries for readability): KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/validation/validation'] KnowledgeAgent adding KnowledgeDefinitionsPackage validation KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/question/question'] KnowledgeAgent adding KnowledgeDefinitionsPackage question KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/referral/referral'] KnowledgeAgent adding KnowledgeDefinitionsPackage referral KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/cover/cover'] KnowledgeAgent adding KnowledgeDefinitionsPackage cover KnowledgeAgent new KnowledgeBase now built and in use And the ResourceChangeScanner then scans for changes every 60 seconds: ResourceChangeScanner attempt to scan 4 resources ResourceChangeScanner thread is waiting for 60 When we change the "referral" package and rebuild the snapshot so that the application can pick it up, here's what happens: ResourceChangeScanner removed resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/referral/referral'] ResourceChangeNotification received ChangeSet notification ResourceChangeScanner thread is waiting for 60 ResourceChangeNotification processing ChangeSet ResourceChangeNotification ChangeSet removed resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/referral/referral'] for listener=org.drools.agent.impl.KnowledgeAgentImpl@7a1b5b KnowledgeAgent received ChangeSet changed notification KnowledgAgent applying ChangeSet KnowledgeAgent unsubscribing from resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/referral/referral'] ResourceChangeNotification unsubscribing listener=org.drools.agent.impl.KnowledgeAgentImpl@7a1b5b to resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/referral/referral'] KnowledgeAgent ChangeSet requires KnowledgeBuilder KnowledgeAgent ChangeSet requires KnowledgeBuilder KnowledgeAgent ChangeSet requires KnowledgeBuilder KnowledgeAgent rebuilding KnowledgeBase using ChangeSet ResourceChangeNotification thread is waiting for queue update KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/validation/validation'] KnowledgeAgent adding KnowledgeDefinitionsPackage validation KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/question/question'] KnowledgeAgent adding KnowledgeDefinitionsPackage question KnowledgeAgent building resource=[UrlResource path='http://localhost/drools-guvnor/org.drools.guvnor.Guvnor/package/cover/cover'] KnowledgeAgent adding KnowledgeDefinitionsPackage cover KnowledgeAgent new KnowledgeBase now built and in use ResourceChangeScanner attempt to scan 3 resources ResourceChangeScanner thread is waiting for 60 From this point on it seems to be impossible to get the ResourceChangeScanner to pick up the new "referral" snapshot. I've tried updating the changeset file and redeploying the snapshot but the application won't pick it up. This problem doesn't occur with every snapshot rebuild but it does happen quite frequently. Has anyone else struck this problem? Is there any way around it? Cheers Peter Butler