Hi All, I am just trying to call the package created in the Guvnor using sample java class by loading from the properties. As below : public static final void main(String[] args) { System.out.println("Mainnnnnnnnnn"); Properties properties = new Properties(); try { properties.load(new FileInputStream("Guvnor.properties")); } catch (IOException e) { } RuleAgent agent = RuleAgent.newRuleAgent(properties); RuleBase ruleBase = agent.getRuleBase(); WorkingMemory workingMemory = ruleBase.newStatefulSession(); GuvnorModel gm=new GuvnorModel(); gm.setAge(22); workingMemory.insert(gm); workingMemory.fireAllRules(); for (Iterator i = workingMemory.iterateObjects(); i.hasNext();) { System.out.println(i.next().getClass().getCanonicalName()); } } // and got the following error : RuleAgent(default) EXCEPTION (Sun Apr 04 15:38:12 EDT 2010): org.drools.rule.DialectRuntimeRegistry; local class incompatible: stream classdesc serialVersionUID = 5308493362083281112, local class serialVersionUID = 2297533903900118816. Stack trace should follow. java.io.InvalidClassException: org.drools.rule.DialectRuntimeRegistry; local class incompatible: stream classdesc serialVersionUID = 5308493362083281112, local class serialVersionUID = 2297533903900118816 at java.io.ObjectStreamClass.initNonProxy(ObjectStreamClass.java:562) at java.io.ObjectInputStream.readNonProxyDesc(ObjectInputStream.java:1583) at java.io.ObjectInputStream.readClassDesc(ObjectInputStream.java:1496) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1732) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.rule.Package.readExternal(Package.java:198) at java.io.ObjectInputStream.readExternalData(ObjectInputStream.java:1792) at java.io.ObjectInputStream.readOrdinaryObject(ObjectInputStream.java:1751) at java.io.ObjectInputStream.readObject0(ObjectInputStream.java:1329) at java.io.ObjectInputStream.readObject(ObjectInputStream.java:351) at org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:189) at org.drools.core.util.DroolsStreamUtils.streamIn(DroolsStreamUtils.java:158) at org.drools.agent.HttpClientImpl.fetchPackage(HttpClientImpl.java:50) at org.drools.agent.URLScanner.readPackage(URLScanner.java:148) at org.drools.agent.URLScanner.getChangeSet(URLScanner.java:120) at org.drools.agent.URLScanner.loadPackageChanges(URLScanner.java:96) at org.drools.agent.RuleAgent.checkForChanges(RuleAgent.java:410) at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:362) at org.drools.agent.RuleAgent.configure(RuleAgent.java:347) at org.drools.agent.RuleAgent.init(RuleAgent.java:247) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147) at com.sample.DroolsTest.main(DroolsTest.java:33) Exception in thread "main" java.lang.NullPointerException at org.drools.agent.RuleAgent.refreshRuleBase(RuleAgent.java:363) at org.drools.agent.RuleAgent.configure(RuleAgent.java:347) at org.drools.agent.RuleAgent.init(RuleAgent.java:247) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:187) at org.drools.agent.RuleAgent.newRuleAgent(RuleAgent.java:147) at com.sample.DroolsTest.main(DroolsTest.java:33) -------- Could anyone pls. let me know the solution for the above issue . Regards, Shantha

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