On 7/23/09, Olaf Raether <o.raether(a)epro.de&gt; wrote: I'd expect to find "Package pkg = rules[i];" or similar in the loop. Anyway, this doesn't tell how the Package objects were created from your two rules files, which might be significant. Do you check for package build errors? -W for (int i = 0; i < facts.length; i++) {

Consider adapting to the new API using KnowledgeBuilder etc. You can use a ObjectOutput/InputStream with write/readObject on Collection<KnowledgePackage>, which simplifies matters somewhat. See below, two remarks. On 7/23/09, Olaf Raether <o.raether(a)epro.de&gt; wrote: Here, call builder.getErrors() or at least builder.hasErrors() and check the result. Above, we had rulefile1, rulefile2? RuleBase ruleBase = RuleBaseFactory.newRuleBase();

Mmmh, i still get an NPE but from a different function within ClassFieldReader.java with the 4.07 Api calls it was at org.drools.base.ClassFieldReader.isNullValue(ClassFieldReader.java:183) now its java.lang.NullPointerException at org.drools.base.ClassFieldReader.getIndex(ClassFieldReader.java:78) at org.drools.util.LeftTupleIndexHashTable.<init>(LeftTupleIndexHashTable.java:48) at org.drools.util.LeftTupleIndexHashTable.<init>(LeftTupleIndexHashTable.java:35) at org.drools.common.DoubleBetaConstraints.createBetaMemory(DoubleBetaConstraints.java:231) at org.drools.reteoo.BetaNode.createMemory(BetaNode.java:340) ..... i have no idea how to solve this at the moment. -- View this message in context: http://www.nabble.com/Problem-when-using-multiple-rule-files-%28Drools-5%... Sent from the drools - user mailing list archive at Nabble.com.

The rules and the facts are the same. So i add the source to the project and (try to) debug into the code. The NPE occurs in the "getIndex" method (see source fragment below) and the reader member is NULL. And the only point where "reader" is set is in the "setReadAccessor" method, but the method is not called in this context. a testcase - hope it is reproducible then. part of ClassFieldReader.java ... public void setReadAccessor(InternalReadAccessor reader) { this.reader = reader; } public int getIndex() { return this.reader.getIndex(); } ... -- View this message in context: http://www.nabble.com/Problem-when-using-multiple-rule-files-%28Drools-5%... Sent from the drools - user mailing list archive at Nabble.com.

now i found out, that my problems are in relation to my serialized KnowledgePackages. When i use the following code and load the drl files everything is fine ! KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource(rules[i] + ".drl")), ResourceType.DRL); But this takes too long, when i used it the first time - so i want to use serialized KnowledgePackages again. So my question is: What is the right way to serialize/deserialize KnowledgePackages ? As you have seen in my posts i used standard readObject/writeObject methods. Is this the right approach ? Thanks. -- View this message in context: http://www.nabble.com/Problem-when-using-multiple-rule-files-%28Drools-5%... Sent from the drools - user mailing list archive at Nabble.com.

Now i found my fault ! What i did wrong was writting every single drl -file into seperate pkg - file instead of writing them in one single pkg - file. I find my error in reasoning with the follow code (modified hello world example from drools project wizzard). Adding the two drl - files result only in ONE pkg - file. Thanks to everyone ! package com.sample; import java.io.FileInputStream; import java.io.FileOutputStream; import java.io.ObjectInputStream; import java.io.ObjectOutputStream; import java.util.ArrayList; import java.util.Collection; import org.drools.KnowledgeBase; import org.drools.KnowledgeBaseFactory; import org.drools.builder.KnowledgeBuilder; import org.drools.builder.KnowledgeBuilderError; import org.drools.builder.KnowledgeBuilderErrors; import org.drools.builder.KnowledgeBuilderFactory; import org.drools.builder.ResourceType; import org.drools.definition.KnowledgePackage; import org.drools.io.ResourceFactory; import org.drools.logger.KnowledgeRuntimeLogger; import org.drools.logger.KnowledgeRuntimeLoggerFactory; import org.drools.runtime.StatefulKnowledgeSession; /** * This is a sample class to launch a rule. */ public class DroolsTest { public static final void main(String[] args) { try { // load up the knowledge base KnowledgeBase kbase = readKnowledgeBase(); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); KnowledgeRuntimeLogger logger = KnowledgeRuntimeLoggerFactory.newFileLogger(ksession, "test"); // go ! Message message = new Message(); message.setMessage("Hello World"); message.setStatus(Message.HELLO); ksession.insert(message); ksession.fireAllRules(); logger.close(); } catch (Throwable t) { t.printStackTrace(); } } private static KnowledgeBase readKnowledgeBase() throws Exception { KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add(ResourceFactory.newClassPathResource("Sample0.drl"), ResourceType.DRL); kbuilder.add(ResourceFactory.newClassPathResource("Sample1.drl"), ResourceType.DRL); KnowledgeBuilderErrors errors = kbuilder.getErrors(); if (errors.size() > 0) { for (KnowledgeBuilderError error: errors) { System.err.println(error); } throw new IllegalArgumentException("Could not parse knowledge."); } // Write pks to file Collection<KnowledgePackage> pks = kbuilder.getKnowledgePackages(); int i =0; for(KnowledgePackage kp : pks) { ObjectOutputStream out = new ObjectOutputStream( new FileOutputStream( "Sample"+i+".pkg" ) ); System.out.println("Write:"+ "Sample"+i+".pkg"); out.writeObject( kp ); out.close(); i++; } // Read them again Collection<KnowledgePackage> kpkgs = new ArrayList<KnowledgePackage>(); for(;i > 0; i--) { ObjectInputStream in = new ObjectInputStream(new FileInputStream("Sample"+(i-1)+".pkg")); Object o = in.readObject(); System.out.println("Read:"+ "Sample"+i+".pkg"); in.close(); KnowledgePackage kp = (KnowledgePackage)o; kpkgs.add(kp); } KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages(kpkgs); return kbase; } public static class Message { public static final int HELLO = 0; public static final int GOODBYE = 1; public static final int START = 2; public static final int STOP = 3; private String message; private int status; public String getMessage() { return this.message; } public void setMessage(String message) { this.message = message; } public int getStatus() { return this.status; } public void setStatus(int status) { this.status = status; } } } Sample0.drl -------------------- package com.sample import com.sample.DroolsTest.Message; rule "Hello World" when m : Message( status == Message.HELLO, myMessage : message ) then System.out.println( "Hello" ); m.setMessage( "Goodbye cruel world" ); m.setStatus( Message.GOODBYE ); update( m ); end rule "GoodBye" when m : Message( status == Message.GOODBYE, myMessage : message ) then System.out.println( myMessage ); m.setMessage("Start"); m.setStatus( Message.START ); update( m ); end Sample1.drl -------------------------------------------------------------- package com.sample import com.sample.DroolsTest.Message; rule "Start" when m : Message( status == Message.START, myMessage : message ) then System.out.println( myMessage ); m.setMessage( "Stop" ); m.setStatus( Message.STOP ); update( m ); end rule "Stop" when m : Message( status == Message.STOP, myMessage : message ) then System.out.println( myMessage ); end -- View this message in context: http://www.nabble.com/Problem-when-using-multiple-rule-files-%28Drools-5%... Sent from the drools - user mailing list archive at Nabble.com.