Diablo_UK wrote: 
Just done a little bit more digging and it seems that the exception is
occuring when the package is attempted to be read.

If I point a browser at the url, I get the "opening package" dialog from the
browser.  Does this mean that Guvnor hasn't generated the package correctly?

Anyone got *any* ideas?
Rules Dev is for the development of drools, not for questions about the use of drools. Please ask this on the user mailing list, which is detailed in the link below. Please also read the 17 netiquette points.
http://www.jboss.org/drools/lists.html
"The user mailing list is for general user querries about drools and how to use and it problems with using it. The dev mailing list is for more hard core discussions about about developing drools itself and general rules/ai theory that might apply to future drools features." 
Diablo_UK wrote:
  
Hi guys,

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/myNewPackage/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

But I have no idea why!!!!

Can any of you guys please please please help a newbie?

Many thanks,
Adrian M Bell