I trying to create new object with ActionHandler event:
In processdefinition.xml:

<task-node name="test">
 <task swimlane="st">
 <event type="task-create">
 <action class="jbpm.Create"/>
 </event>
...

I have 2 class
Create class:

import org.jbpm.graph.def.ActionHandler;
import org.jbpm.graph.exe.ExecutionContext;

public class Create implements ActionHandler {

 private static final long serialVersionUID = 1L;

 public void execute(ExecutionContext executionContext) throws Exception {
 System.out.println("=======");
 ListData list;
 list = new ListData("test");
 System.out.println("=======");
 String dt = list.getName();
 executionContext.setVariable("lt", list);
 executionContext.setVariable("dt", dt);
 }
}

ListData class:

public class ListData{
 private String name;

 public ListData(){}

 public ListData(String name){
 System.out.println("=========="+name+"======");
 this.name=name;
 }

 public void setName(String name){
 this.name=name;
 }

 public String getName(){
 return this.name;
 }

 public String toString(){
 return name;
 }
}

I deploy OK, when i run have this error:

14:42:40,500 INFO [STDOUT] =======
14:42:40,500 ERROR [GraphElement] action threw exception: couldn't get value for file 'classes/softech/jbpm/ListData.clas
java.lang.RuntimeException: couldn't get value for file 'classes/softech/jbpm/ListData.class'
 at org.jbpm.file.def.FileDefinition.getBytes(FileDefinition.java:160)
 at org.jbpm.instantiation.ProcessClassLoader.findClass(ProcessClassLoader.java:34)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:306)
 at java.lang.ClassLoader.loadClass(ClassLoader.java:251)
 at java.lang.ClassLoader.loadClassInternal(ClassLoader.java:319)
 at softech.jbpm.Create.execute(Create.java:13)
 at org.jbpm.graph.def.Action.execute(Action.java:95)
 at org.jbpm.graph.def.GraphElement.executeActions(GraphElement.java:186)
 at org.jbpm.graph.def.GraphElement.fireAndPropagateEvent(GraphElement.java:149)
 at org.jbpm.graph.def.GraphElement.fireEvent(GraphElement.java:133)
 at org.jbpm.taskmgmt.exe.TaskInstance.create(TaskInstance.java:210)
 at org.jbpm.taskmgmt.exe.TaskMgmtInstance.createTaskInstance(TaskMgmtInstance.java:102)
 at org.jbpm.taskmgmt.exe.TaskMgmtInstance$$FastClassByCGLIB$$e1d53490.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
 at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:136)
 at org.jbpm.taskmgmt.exe.TaskMgmtInstance$$EnhancerByCGLIB$$13a7b02c.createTaskInstance(<generated>)
 at org.jbpm.graph.node.TaskNode.execute(TaskNode.java:146)
 at org.jbpm.graph.def.Node.enter(Node.java:298)
 at org.jbpm.graph.def.Node$$FastClassByCGLIB$$d187eeda.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
 at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:136)
 at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$17a2c776.enter(<generated>)
 at org.jbpm.graph.def.Transition.take(Transition.java:92)
 at org.jbpm.graph.def.Node.leave(Node.java:364)
 at org.jbpm.graph.node.StartState.leave(StartState.java:49)
 at org.jbpm.graph.def.Node$$FastClassByCGLIB$$d187eeda.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
 at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:136)
 at org.jbpm.graph.def.Node$$EnhancerByCGLIB$$17a2c776.leave(<generated>)
 at org.jbpm.graph.exe.Token.signal(Token.java:140)
 at org.jbpm.graph.exe.Token.signal(Token.java:94)
 at org.jbpm.graph.exe.Token$$FastClassByCGLIB$$74df1c6e.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
 at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:136)
 at org.jbpm.graph.exe.Token$$EnhancerByCGLIB$$a8732f0a.signal(<generated>)
 at org.jbpm.taskmgmt.exe.TaskInstance.end(TaskInstance.java:459)
 at org.jbpm.taskmgmt.exe.TaskInstance.end(TaskInstance.java:376)
 at org.jbpm.taskmgmt.exe.TaskInstance$$FastClassByCGLIB$$cb2c21af.invoke(<generated>)
 at net.sf.cglib.proxy.MethodProxy.invoke(MethodProxy.java:149)
 at org.hibernate.proxy.CGLIBLazyInitializer.intercept(CGLIBLazyInitializer.java:136)
 at org.jbpm.taskmgmt.exe.TaskInstance$$EnhancerByCGLIB$$c05c40cb.end(<generated>)
 at org.jbpm.webapp.bean.TaskBean.saveAndClose(TaskBean.java:156)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
 at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
 at java.lang.reflect.Method.invoke(Method.java:585)
 at org.apache.myfaces.el.MethodBindingImpl.invoke(MethodBindingImpl.java:129)
 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:63)
 at javax.faces.component.UICommand.broadcast(UICommand.java:106)
 at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
 at javax.faces.component.UIViewRoot.processApplication(UIViewRoot.java:164)
 at org.apache.myfaces.lifecycle.LifecycleImpl.invokeApplication(LifecycleImpl.java:271)
 at org.apache.myfaces.lifecycle.LifecycleImpl.execute(LifecycleImpl.java:86)
 at javax.faces.webapp.FacesServlet.service(FacesServlet.java:94)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jbpm.webapp.filter.AuthenticationFilter.doFilter(AuthenticationFilter.java:25)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jbpm.webapp.filter.PersistenceFilter.doFilter(PersistenceFilter.java:28)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jbpm.webapp.filter.ContextFilter.doFilter(ContextFilter.java:19)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jbpm.webapp.filter.LogFilter.doFilter(LogFilter.java:38)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
 at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
 at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
 at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
 at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
 at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
 at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
 at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
 at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
 at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
 at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
 at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
 at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
 at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
 at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
 at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
 at java.lang.Thread.run(Thread.java:595)
Caused by: java.lang.RuntimeException: file 'classes/softech/jbpm/ListData.class' not found in db
 at org.jbpm.file.def.FileDefinition.getByteArray(FileDefinition.java:184)
 at org.jbpm.file.def.FileDefinition.getBytesFromDb(FileDefinition.java:176)
 at org.jbpm.file.def.FileDefinition.getBytes(FileDefinition.java:157)
 ... 84 more
14:42:40,640 DEBUG [PersistenceContext] rolling back transaction
14:42:40,640 ERROR [[FacesServlet]] Servlet.service() for servlet FacesServlet threw exception
javax.faces.FacesException: Error calling action method of component with id taskform:transitionButton
 at org.apache.myfaces.application.ActionListenerImpl.processAction(ActionListenerImpl.java:74)
 at javax.faces.component.UICommand.broadcast(UICommand.java:106)
 at javax.faces.component.UIViewRoot._broadcastForPhase(UIViewRoot.java:90)
.....

Why? Please help me.
Thanks.