Hi guys, My apologies if I have sent this to the wrong mailing-list (again)! I'm very new to Guvnor and Drools and all these exciting tools. I'm working my way through the example that I found here: http://www.jboss.org/feeds/post/jboss_drools_how_to_tuning_guvnor_part_1 and everything was just fine and dandy until I had to run the java code! Unfortunately, I get the following output: RuleAgent(default) INFO (Tue Feb 24 17:20:57 GMT 2009): Configuring with newInstance=false, secondsToRefresh=-1 RuleAgent(default) INFO (Tue Feb 24 17:20:57 GMT 2009): Configuring package provider : URLScanner monitoring URLs: http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/myN ewPackage/LATEST RuleAgent(default) EXCEPTION (Tue Feb 24 17:20:58 GMT 2009): null. Stack trace should follow. java.io.OptionalDataException at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1340) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:59) at org.drools.agent.URLScanner.readPackage(URLScanner.java:138) at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:110) at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:88) at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:330) at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:298) at org.drools.agent.RuleAgent.configure(RuleAgent.java:284) at org.drools.agent.RuleAgent.init(RuleAgent.java:208) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:176) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:148) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:216) at com.ioko.GuvnorTest.main(GuvnorTest.java:27) com.ioko.Driver I've had a dig around the source and can see that the problem occurs at the point the package is being read. This makes me wonder if the package I generated from Guvnor is not correct in some way. If I point a browser at the url, I get the 'opening file' dialog from the browser, asking me to save the file. I'm really lost right now. It seems that Guvnor is a pretty good product and would be a good fit. Can any of you guys please please please help a newbie? Many thanks, Adrian M Bell Adrian M Bell ioko *+44 (0)1904 438 000 * +44 (0)7515 580652 www.ioko.com <http://www.ioko.com/> No.1 Technical Agency, NMA Top 100 Interactive Agencies, 2008 Sunday Times Tech Track 100, 2008 ioko Digital Vision. Delivered.