Error while invoking Guvnor Rule from DRools project
by Khushbu.Bajaj＠cognizant.com
Hi,
We are trying to invoke Guvnor rule(drools-5.0.0.M1-guvnor) from a
Drools project.
For creating the rule in Guvnor, following steps were followed:
1) Created a category through Guvnor UI
2) Created a Package named "myNewPackage" under that category.
3) Created and imported a model to this package by uploading it
through Guvnor.
4) Created a Rule with myNewPakage as the destination package.
5) Validated and saved the rule and built the package.
Attached is the Java code for invoking the above created Guvnor rule
from a Drools project.
We are getting the following error while running the Java code:
RuleAgent(default) INFO (Fri Jan 16 19:11:21 IST 2009): Configuring with
newInstance=false, secondsToRefresh=-1
RuleAgent(default) INFO (Fri Jan 16 19:11:21 IST 2009): Configuring
package provider : URLScanner monitoring URLs:
http://localhost:8080/drools-guvnor/org.drools.guvnor.Guvnor/package/myN
ewPackage/LATEST
RuleAgent(default) EXCEPTION (Fri Jan 16 19:11:26 IST 2009): null. Stack
trace should follow.
java.io.OptionalDataException
at
java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1316)
at
java.io.ObjectInputStream.readObject(ObjectInputStream.java:348)
at
org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:185)
at
org.drools.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:154)
at
org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:47)
at org.drools.agent.URLScanner.readPackage(URLScanner.java:142)
at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:114)
at
org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:90)
at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:393)
at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:345)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:330)
at org.drools.agent.RuleAgent.init(RuleAgent.java:246)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:185)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:145)
at kijanowski.eu.GuvnorTest.main(GuvnorTest.java:17)
Exception in thread "main" java.lang.NullPointerException
at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:346)
at org.drools.agent.RuleAgent.configure(RuleAgent.java:330)
at org.drools.agent.RuleAgent.init(RuleAgent.java:246)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:185)
at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:145)
at kijanowski.eu.GuvnorTest.main(GuvnorTest.java:17)
What could be the possible solution for the same?
Regards,
Khushbu Bajaj
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