[rules-users] Using Rule Flow

Hi, Has any one used Rule FLow with 4.0.0. I am looking for some help on how to use rule flow, where to mention the drl file name. How to use it in the java invoker classes. I have tried something, created a TestRuleFlow.rf, then added a rule group, gave it a group name as drl file name. When i use the PackageBuilder to add the rule flow, it throws the following exception * com.thoughtworks.xstream.alias.CannotResolveClassException*: org.drools.ruleflow.core.impl.RuleFlowProcess : org.drools.ruleflow.core.impl.RuleFlowProcess at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(* DefaultMapper.java:35*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.XmlFriendlyMapper.realClass(* XmlFriendlyMapper.java:44*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(* ClassAliasingMapper.java:49*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(* DynamicProxyMapper.java:46*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(*ArrayMapper.java :70*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.CachingMapper.realClass(* CachingMapper.java:27*) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(* TreeUnmarshaller.java:95*) at com.thoughtworks.xstream.core.ReferenceByIdMarshallingStrategy.unmarshal( *ReferenceByIdMarshallingStrategy.java:12*) at com.thoughtworks.xstream.XStream.unmarshal(*XStream.java:552*) at com.thoughtworks.xstream.XStream.unmarshal(*XStream.java:540*) at com.thoughtworks.xstream.XStream.fromXML(*XStream.java:490*) at org.drools.compiler.ProcessBuilder.addProcessFromFile(* ProcessBuilder.java:76*) at org.drools.compiler.PackageBuilder.addRuleFlow(*PackageBuilder.java:199*) at com.drools.sample.ParseDRL.readRuleFromDrl(*ParseDRL.java:72*) at com.drools.sample.ParseDRL.main(*ParseDRL.java:23*) * com.thoughtworks.xstream.alias.CannotResolveClassException*: org.drools.ruleflow.core.impl.RuleFlowProcess : org.drools.ruleflow.core.impl.RuleFlowProcess at com.thoughtworks.xstream.mapper.DefaultMapper.realClass(* DefaultMapper.java:35*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.XmlFriendlyMapper.realClass(* XmlFriendlyMapper.java:44*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.ClassAliasingMapper.realClass(* ClassAliasingMapper.java:49*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.DynamicProxyMapper.realClass(* DynamicProxyMapper.java:46*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.ArrayMapper.realClass(*ArrayMapper.java :70*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.MapperWrapper.realClass(* MapperWrapper.java:18*) at com.thoughtworks.xstream.mapper.CachingMapper.realClass(* CachingMapper.java:27*) at com.thoughtworks.xstream.core.TreeUnmarshaller.start(* TreeUnmarshaller.java:95*) at com.thoughtworks.xstream.core.ReferenceByIdMarshallingStrategy.unmarshal( *ReferenceByIdMarshallingStrategy.java:12*) at com.thoughtworks.xstream.XStream.unmarshal(*XStream.java:552*) at com.thoughtworks.xstream.XStream.unmarshal(*XStream.java:540*) at com.thoughtworks.xstream.XStream.fromXML(*XStream.java:490*) at org.drools.compiler.ProcessBuilder.addProcessFromFile(* ProcessBuilder.java:76*) at org.drools.compiler.PackageBuilder.addRuleFlow(*PackageBuilder.java:199*) at com.drools.sample.ParseDRL.readRuleFromDrl(*ParseDRL.java:72*) at com.drools.sample.ParseDRL.main(*ParseDRL.java:23*) Exception in thread "main"