M Arnold [http://community.jboss.org/people/marnold] created the discussion "NPE Loading Knowledge Base from URL" To view the discussion, visit: http://community.jboss.org/message/645516#645516 -------------------------------------------------------------- Hi, I'm using Drools and Guvnor 5.3.1.  When I try to load my knowledge base from Guvnor like this: {code}    KnowledgeAgentConfiguration kaconf = KnowledgeAgentFactory.newKnowledgeAgentConfiguration();              kaconf.setProperty("drools.agent.scanDirectories", "false");              kaconf.setProperty("drools.agent.scanResources", "false");              KnowledgeAgent ka = KnowledgeAgentFactory.newKnowledgeAgent("agent", kaconf);              URL url = new URL(urlString);              UrlResource urlResource = (UrlResource)ResourceFactory.newUrlResource(url);              ka.applyChangeSet(urlResource);              kbase = ka.getKnowledgeBase(); {code} I get this exception: {code} java.lang.NullPointerException         at org.drools.impl.KnowledgeBaseImpl.addKnowledgePackages(KnowledgeBaseImpl.java:148)         at org.drools.agent.impl.KnowledgeAgentImpl.addResourcesToKnowledgeBase(KnowledgeAgentImpl.java:1016)         at org.drools.agent.impl.KnowledgeAgentImpl.rebuildResources(KnowledgeAgentImpl.java:785)         at org.drools.agent.impl.KnowledgeAgentImpl.buildKnowledgeBase(KnowledgeAgentImpl.java:657)         at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:190)         at org.drools.agent.impl.KnowledgeAgentImpl.applyChangeSet(KnowledgeAgentImpl.java:169) [snip] {code} I've tried 'Rebuilding all snapshot binaries'.  Has my repository become corrupted? Also, can I build my knowledge base directly from Guvnor's JCR implementation, rather than over HTTP?  I'm not interested in listening / scanning for changes to the underlying packages.  I just want to load my rules and processes from Guvnor. Apologies if this is not the correct forum.  I couldn't find a discussion forum for Drools. Thanks -------------------------------------------------------------- Reply to this message by going to Community [http://community.jboss.org/message/645516#645516] Start a new discussion in jBPM at Community [http://community.jboss.org/choose-container!input.jspa?contentType=1&...]