ClassCastException when casting process variables

[mskaesz]

Hey guys,

I'm getting ClassCastExceptions when trying to cast process variables into my own variables:

…
public class PersistBookingDelegate implements JavaDelegate {

   private BookingDAOLocal bookingDAOLocal;

   @Override
   public void execute(DelegateExecution e) throws Exception {
      try {
         InitialContext ctx = new InitialContext();
         bookingDAOLocal = (BookingDAOLocal) ctx.lookup("Advertising_v1.0/BookingDAO/local");
      } catch (NamingException ex) {
         ex.printStackTrace();
      }

      BookingDTO b = (BookingDTO) e.getVariable("bookingDTO");

      EBooking booking = bookingDAOLocal.makePersistent(BookingHelper.mapDTOToEntity(b));
   }
}

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10:03:18,246 ERROR [STDERR] java.lang.ClassCastException: de.advertising.backend.dto.BookingDTO cannot be cast to de.advertising.backend.dto.BookingDTO
10:03:18,246 ERROR [STDERR]    at de.advertising.backend.delegates.PersistBookingDelegate.execute(PersistBookingDelegate.java:42)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.ClassDelegate.execute(ClassDelegate.java:96)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:40)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.ExecutionImpl.performOperation(ExecutionImpl.java:521)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.ExecutionImpl.take(ExecutionImpl.java:387)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.BpmnActivityBehavior.performOutgoingBehavior(BpmnActivityBehavior.java:86)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.BpmnActivityBehavior.performDefaultOutgoingBehavior(BpmnActivityBehavior.java:47)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.AbstractBpmnActivity.leave(AbstractBpmnActivity.java:44)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.UserTaskActivity.signal(UserTaskActivity.java:62)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.ExecutionImpl.signal(ExecutionImpl.java:371)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.task.TaskEntity.complete(TaskEntity.java:172)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:52)
10:03:18,246 ERROR [STDERR]    at org.activiti.engine.impl.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:27)
10:03:18,247 ERROR [STDERR]    at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:22)
10:03:18,247 ERROR [STDERR]    at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:37)
10:03:18,247 ERROR [STDERR]    at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
10:03:18,247 ERROR [STDERR]    at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:100)
10:03:18,247 ERROR [STDERR]    at de.advertising.frontend.windows.CheckBookingWindow$1.buttonClick(CheckBookingWindow.java:59)
10:03:18,247 ERROR [STDERR]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:03:18,247 ERROR [STDERR]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
10:03:18,247 ERROR [STDERR]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
10:03:18,247 ERROR [STDERR]    at java.lang.reflect.Method.invoke(Method.java:597)
10:03:18,247 ERROR [STDERR]    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:487)
10:03:18,247 ERROR [STDERR]    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)
10:03:18,247 ERROR [STDERR]    at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1154)
10:03:18,247 ERROR [STDERR]    at com.vaadin.ui.Button.fireClick(Button.java:371)
10:03:18,247 ERROR [STDERR]    at com.vaadin.ui.Button.changeVariables(Button.java:193)
10:03:18,247 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1094)
10:03:18,247 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:590)
10:03:18,247 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:266)
10:03:18,247 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:476)
10:03:18,247 ERROR [STDERR]    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
10:03:18,247 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
10:03:18,247 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
10:03:18,248 ERROR [STDERR]    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
10:03:18,248 ERROR [STDERR]    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
10:03:18,248 ERROR [STDERR]    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
10:03:18,248 ERROR [STDERR]    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
10:03:18,248 ERROR [STDERR]    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
10:03:18,248 ERROR [STDERR]    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
10:03:18,248 ERROR [STDERR]    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
10:03:18,248 ERROR [STDERR]    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
10:03:18,248 ERROR [STDERR]    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
10:03:18,248 ERROR [STDERR]    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
10:03:18,248 ERROR [STDERR]    at java.lang.Thread.run(Thread.java:662)
10:03:18,251 ERROR [STDERR] com.vaadin.event.ListenerMethod$MethodException
Cause: java.lang.ClassCastException: de.advertising.backend.dto.BookingDTO cannot be cast to de.advertising.backend.dto.BookingDTO
10:03:18,251 ERROR [STDERR]    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:507)
10:03:18,252 ERROR [STDERR]    at com.vaadin.event.EventRouter.fireEvent(EventRouter.java:161)
10:03:18,252 ERROR [STDERR]    at com.vaadin.ui.AbstractComponent.fireEvent(AbstractComponent.java:1154)
10:03:18,252 ERROR [STDERR]    at com.vaadin.ui.Button.fireClick(Button.java:371)
10:03:18,252 ERROR [STDERR]    at com.vaadin.ui.Button.changeVariables(Button.java:193)
10:03:18,252 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.handleVariables(AbstractCommunicationManager.java:1094)
10:03:18,252 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.AbstractCommunicationManager.doHandleUidlRequest(AbstractCommunicationManager.java:590)
10:03:18,252 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.CommunicationManager.handleUidlRequest(CommunicationManager.java:266)
10:03:18,252 ERROR [STDERR]    at com.vaadin.terminal.gwt.server.AbstractApplicationServlet.service(AbstractApplicationServlet.java:476)
10:03:18,252 ERROR [STDERR]    at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
10:03:18,252 ERROR [STDERR]    at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:235)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:235)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191)
10:03:18,252 ERROR [STDERR]    at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:190)
10:03:18,252 ERROR [STDERR]    at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:92)
10:03:18,252 ERROR [STDERR]    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.process(SecurityContextEstablishmentValve.java:126)
10:03:18,252 ERROR [STDERR]    at org.jboss.web.tomcat.security.SecurityContextEstablishmentValve.invoke(SecurityContextEstablishmentValve.java:70)
10:03:18,252 ERROR [STDERR]    at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
10:03:18,253 ERROR [STDERR]    at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
10:03:18,253 ERROR [STDERR]    at org.jboss.web.tomcat.service.jca.CachedConnectionValve.invoke(CachedConnectionValve.java:158)
10:03:18,253 ERROR [STDERR]    at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
10:03:18,253 ERROR [STDERR]    at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:330)
10:03:18,253 ERROR [STDERR]    at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:829)
10:03:18,253 ERROR [STDERR]    at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:598)
10:03:18,253 ERROR [STDERR]    at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:447)
10:03:18,253 ERROR [STDERR]    at java.lang.Thread.run(Thread.java:662)
10:03:18,253 ERROR [STDERR] Caused by: java.lang.ClassCastException: de.advertising.backend.dto.BookingDTO cannot be cast to de.advertising.backend.dto.BookingDTO
10:03:18,253 ERROR [STDERR]    at de.advertising.backend.delegates.PersistBookingDelegate.execute(PersistBookingDelegate.java:42)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.ClassDelegate.execute(ClassDelegate.java:96)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.AtomicOperationActivityExecute.execute(AtomicOperationActivityExecute.java:40)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.ExecutionImpl.performOperation(ExecutionImpl.java:521)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.ExecutionImpl.take(ExecutionImpl.java:387)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.BpmnActivityBehavior.performOutgoingBehavior(BpmnActivityBehavior.java:86)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.BpmnActivityBehavior.performDefaultOutgoingBehavior(BpmnActivityBehavior.java:47)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.AbstractBpmnActivity.leave(AbstractBpmnActivity.java:44)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.bpmn.UserTaskActivity.signal(UserTaskActivity.java:62)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.pvm.runtime.ExecutionImpl.signal(ExecutionImpl.java:371)
10:03:18,253 ERROR [STDERR]    at org.activiti.engine.impl.task.TaskEntity.complete(TaskEntity.java:172)
10:03:18,254 ERROR [STDERR]    at org.activiti.engine.impl.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:52)
10:03:18,254 ERROR [STDERR]    at org.activiti.engine.impl.cmd.CompleteTaskCmd.execute(CompleteTaskCmd.java:27)
10:03:18,254 ERROR [STDERR]    at org.activiti.engine.impl.interceptor.CommandExecutorImpl.execute(CommandExecutorImpl.java:22)
10:03:18,254 ERROR [STDERR]    at org.activiti.engine.impl.interceptor.CommandContextInterceptor.execute(CommandContextInterceptor.java:37)
10:03:18,254 ERROR [STDERR]    at org.activiti.engine.impl.interceptor.LogInterceptor.execute(LogInterceptor.java:33)
10:03:18,254 ERROR [STDERR]    at org.activiti.engine.impl.TaskServiceImpl.complete(TaskServiceImpl.java:100)
10:03:18,254 ERROR [STDERR]    at de.advertising.frontend.windows.CheckBookingWindow$1.buttonClick(CheckBookingWindow.java:59)
10:03:18,254 ERROR [STDERR]    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
10:03:18,254 ERROR [STDERR]    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
10:03:18,254 ERROR [STDERR]    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
10:03:18,254 ERROR [STDERR]    at java.lang.reflect.Method.invoke(Method.java:597)
10:03:18,254 ERROR [STDERR]    at com.vaadin.event.ListenerMethod.receiveEvent(ListenerMethod.java:487)
10:03:18,254 ERROR [STDERR]    … 29 more
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The BookingDTO is in the same jar together with all Delegates, located next to the activiti-engine.jar. The engine is located in my server/default/lib folder (JBoss 5).

Any ideas?

Cheers,
Marc

[frederikherema1]

Strange,

Looks like the BookingDTO class used for casting loaded by a different classloader than the one the variable was deserialized with. Have you tried to deploy the engine and your delegates in the WEB-INF/lib of your webapp?

[mskaesz]

You were right. It was a classloader issue. Deploying the engine in the /lib folder solved the problem. Thanks a lot!

[frederikherema1]

No problem, glad to be of service