wrote:

Folks, I'm trying to use Drools in a mostly Java-less environment (rules are written in .drl files, facts will be inserted from XML files). I'm running into an issue where the XStream unmarshaller is unable to convert my XML to a BatchExecutionCommand because it cannot find the class for a type declared in the .drl file. Is there any configuration required to make sure the XStream marshaller knows about the dynamically generated classes from the .drl? I'd appreciated any clues. I cannot add POJO classes for my types due to the nature of the app. Thanks. DRL file ----------- package com.example declare Answers .... end /* some rules after this */ ... XML file ----------- <batch-execution> <insert> <com.example.Answers> .... Runner code public static void Run(String xmlFactsFile, String drlFilename) { // Compile the drl file KnowledgeBuilder kbuilder = KnowledgeBuilderFactory.newKnowledgeBuilder(); kbuilder.add( ResourceFactory.newFileResource(drlFilename), ResourceType.DRL ); if ( kbuilder.hasErrors() ) { System.err.println( kbuilder.getErrors().toString() ); throw new RuntimeException("Cannot compile \"" + drlFilename + "\""); } // kbase setup from the compiled rules KnowledgeBase kbase = KnowledgeBaseFactory.newKnowledgeBase(); kbase.addKnowledgePackages( kbuilder.getKnowledgePackages() ); StatefulKnowledgeSession ksession = kbase.newStatefulKnowledgeSession(); File facts = new File(xmlFactsFile); BatchExecutionCommand command = (BatchExecutionCommand) BatchExecutionHelper.newXStreamMarshaller().fromXML(facts); ExecutionResults bresults = ksession.execute(command); System.out.println(BatchExecutionHelper.newXStreamMarshaller().toXML(bresults)); } } Error at runtime ---------------------- Exception in thread "main" com.thoughtworks.xstream.converters.ConversionException: com.example.Answers : com.example.Answers ---- Debugging information ---- message : com.example.Answers cause-exception : com.thoughtworks.xstream.mapper.CannotResolveClassException cause-message : com.example.Answers class : org.drools.command.runtime.rule.InsertObjectCommand required-type : org.drools.command.runtime.rule.InsertObjectCommand converter-type : org.drools.runtime.help.impl.XStreamXML$InsertConverter path : /batch-execution/insert/com.example.Answers line number : 3 class[1] : org.drools.command.runtime.BatchExecutionCommandImpl converter-type[1] : com.thoughtworks.xstream.converters.reflection.ReflectionConverter version : null ------------------------------- at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:79) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.doUnmarshal(AbstractReflectionConverter.java:318) at com.thoughtworks.xstream.converters.reflection.AbstractReflectionConverter.unmarshal(AbstractReflectionConverter.java:230) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) at com.thoughtworks.xstream.core.AbstractReferenceUnmarshaller.convert(AbstractReferenceUnmarshaller.java:65) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:66) at com.thoughtworks.xstream.core.TreeUnmarshaller.convertAnother(TreeUnmarshaller.java:50) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(TreeUnmarshaller.java:134) at com.thoughtworks.xstream.core.AbstractTreeMarshallingStrategy.unmarshal(AbstractTreeMarshallingStrategy.java:32) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1035) at com.thoughtworks.xstream.XStream.unmarshal(XStream.java:1019) at com.thoughtworks.xstream.XStream.fromXML(XStream.java:930) at com.intentsoft.RulesEngine.RulesExecution.Run(RulesExecution.java:34) at com.intentsoft.RulesEngine.Main.main(Main.java:10) Caused by: com.thoughtworks.xstream.mapper.CannotResolveClassException: com.example.Answers at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(DefaultMapper.java:56) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(DynamicProxyMapper.java:55) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.PackageAliasingMapper.realClass(PackageAliasingMapper.java:88) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(ClassAliasingMapper.java:79) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(ArrayMapper.java:74) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(MapperWrapper.java:30) at com.thoughtworks.xstream.mapper.CachingMapper.realClass(CachingMapper.java:45) at com.thoughtworks.xstream.core.util.HierarchicalStreams.readClassType(HierarchicalStreams.java:29) at com.thoughtworks.xstream.converters.collections.AbstractCollectionConverter.readItem(AbstractCollectionConverter.java:70) at org.drools.runtime.help.impl.XStreamXML$InsertConverter.unmarshal(XStreamXML.java:135) at com.thoughtworks.xstream.core.TreeUnmarshaller.convert(TreeUnmarshaller.java:72) ... 16 more _______________________________________________ rules-users mailing list rules-users(a)lists.jboss.org https://lists.jboss.org/mailman/listinfo/rules-users