Hi drools team, I am using JBRMS for creating the rules. I am able to download the binary package from JBRMS,and also able to use it in the Runtime System,but when I try to use three packages at a time it generates an error as mentioned below.My Runtime system works fine when I use only two packages.Could you please suggest, what's going wrong.I have checked this error on rules-user list and someone got a reply like it seems to be a bug from Edson Tirelli . Link::: http://lists.jboss.org/pipermail/rules-users/2007-May/001353.html 18:48:02,688 INFO [STDOUT] java.lang.NullPointerException 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.setValue(CompositeO bjectSinkAdapter.java:501) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.CompositeObjectSinkAdapter$HashKey.<init>(CompositeObj ectSinkAdapter.java:441) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.CompositeObjectSinkAdapter.hashSinks(CompositeObjectSi nkAdapter.java:158) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.CompositeObjectSinkAdapter.addObjectSink(CompositeObje ctSinkAdapter.java:72) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.ObjectSource.addObjectSink(ObjectSource.java:104) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.ObjectTypeNode.addObjectSink(ObjectTypeNode.java:313) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.AlphaNode.attach(AlphaNode.java:116) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.BuildUtils.attachNode(BuildUtils.java:129) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.PatternBuilder.attachAlphaNodes(PatternBuilder .java:118) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.PatternBuilder.attachPattern(PatternBuilder.ja va:70) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.PatternBuilder.build(PatternBuilder.java:54) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.GroupElementBuilder$AndBuilder.build(GroupElem entBuilder.java:111) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.GroupElementBuilder.build(GroupElementBuilder. java:69) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.ReteooRuleBuilder.addSubRule(ReteooRuleBuilder .java:143) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.builder.ReteooRuleBuilder.addRule(ReteooRuleBuilder.ja va:108) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.ReteooBuilder.addRule(ReteooBuilder.java:112) 18:48:02,688 INFO [STDOUT] at org.drools.reteoo.ReteooRuleBase.addRule(ReteooRuleBase.java:266) 18:48:02,688 INFO [STDOUT] at org.drools.common.AbstractRuleBase.addPackage(AbstractRuleBase.java:294) 18:48:02,688 INFO [STDOUT] at com.aha.processor.RulesProcessor.readRules(RulesProcessor.java:61) 18:48:02,688 INFO [STDOUT] at com.aha.processor.RulesProcessor.<init>(RulesProcessor.java:40) 18:48:02,688 INFO [STDOUT] at com.aha.processor.RulesProcessor.getInstance(RulesProcessor.java:50) 18:48:02,688 INFO [STDOUT] at com.aha.servlet.MCPServlet.process(MCPServlet.java:95) 18:48:02,688 INFO [STDOUT] at com.aha.servlet.MCPServlet.execute(MCPServlet.java:78) 18:48:02,688 INFO [STDOUT] at com.aha.servlet.MCPServlet.doGet(MCPServlet.java:41) 18:48:02,688 INFO [STDOUT] at com.aha.servlet.MCPServlet.doPost(MCPServlet.java:56) 18:48:02,688 INFO [STDOUT] at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) 18:48:02,688 INFO [STDOUT] at javax.servlet.http.HttpServlet.service(HttpServlet.java:810) 18:48:02,688 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:252) 18:48:02,688 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) 18:48:02,720 INFO [STDOUT] at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilte r.java:81) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Applica tionFilterChain.java:202) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilt erChain.java:173) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValv e.java:213) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValv e.java:178) 18:48:02,720 INFO [STDOUT] at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipa lValve.java:39) 18:48:02,720 INFO [STDOUT] at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAs sociationValve.java:153) 18:48:02,720 INFO [STDOUT] at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.j ava:59) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java :126) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java :105) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve. java:107) 18:48:02,720 INFO [STDOUT] at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:1 48) 18:48:02,720 INFO [STDOUT] at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:85 6) 18:48:02,720 INFO [STDOUT] at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processC onnection(Http11Protocol.java:744) 18:48:02,720 INFO [STDOUT] at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint .java:527) 18:48:02,720 INFO [STDOUT] at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorker Thread.java:112) 18:48:02,720 INFO [STDOUT] at java.lang.Thread.run(Thread.java:595) My Rule Engine code snippet is as follows::: private RulesProcessor(){ ruleBase = RuleBaseFactory.newRuleBase(); System.out.println("rule base constructor fired!!"); try{ FileInputStream fileStream = new FileInputStream( "C:/drools/SessionRule.pkg" ); readRules(ruleBase,fileStream); fileStream = null; fileStream = new FileInputStream( "C:/drools/WorkFlowRulesPackage.pkg" ); readRules(ruleBase,fileStream); fileStream = null; fileStream = new FileInputStream( "C:/drools/AuthorizationPackage.pkg" ); readRules(ruleBase,fileStream); fileStream = null; } catch(Exception e){ e.printStackTrace(); } } private void readRules(RuleBase ruleBase,InputStream inputStream){ ObjectInputStream objectInputStream = null; Object objPackage = null; try { objectInputStream = new ObjectInputStream(inputStream); objPackage = objectInputStream.readObject(); ruleBase.addPackage((Package)objPackage); } catch (IOException e) { e.printStackTrace(); } catch (ClassNotFoundException e) { e.printStackTrace(); } catch (Exception e) { e.printStackTrace(); } finally{ try{ objectInputStream.close(); inputStream.close(); }catch (IOException e){ e.printStackTrace(); } } }