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