Error Injecting Beans in Java Service Task

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rodolfobarbeiro

Hello,

The following error is occurring to me when I try to use Bean in Java Service Task.

org.activiti.engine.ActivitiException: Incompatible type set on field declaration 'myService' for class org.myorg.bpmn.tasks.java.JavaService. Declared value has type org.activiti.engine.impl.el.JuelExpression, while expecting org.activiti.engine.delegate.Expression

Injecting my bean in Activiti (file:spring.xml):

…
<bean id="myService" class="org.myorg.handlers.ServiceHandler" />

 <bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
    <property name="dataSource" ref="dataSource" />
    <property name="transactionManager" ref="transactionManager" />
    <property name="databaseSchemaUpdate" value="true" /> 
    <property name="mailServerHost" value="localhost" />
    <property name="mailServerPort" value="5025" />
    <property name="jobExecutorActivate" value="false" />
    <property name="dbCycleUsed" value="true" />
    <property name="beans">
       <map>
         <entry key="myService" value-ref="myService" />
       </map>
    </property>
  </bean>

…
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My BPMN File:

…
<serviceTask 
   id="CTPService"
   activiti:class="org.myorg.bpmn.tasks.java.JavaService">
   <extensionElements>
      <activiti:field name="myService" expression="#{myService}" />                  
      <activiti:field name="serviceId" expression="CTP.getPlan" />
      <activiti:field name="parameters" expression="event" />              
      <activiti:field name="variablesReturn"  expression="portfolio" />
      <activiti:field name="withoutException" expression="CTPServiceNoException" />
      <activiti:field name="withException" expression="CTPServiceException" />
   </extensionElements>
</serviceTask>
…
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My java class:

package org.myorg.bpmn.tasks.java;

import org.activiti.engine.delegate.Expression;
import org.activiti.engine.impl.pvm.PvmTransition;
import org.activiti.engine.impl.pvm.delegate.ActivityExecution;

public class JavaService implements   org.activiti.engine.impl.pvm.delegate.ActivityBehavior {

…
    private Expression myService;
    private ServiceHandler handler;
…

    public void execute(ActivityExecution execution) throws Exception {
       …
       handler = (ServiceHandler) myService.getValue(execution);
       …
    }
    …
}
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This (<activiti:field name="myService" expression="#{myService}" />) is the correct way to inject my Bean in Java Service Task?

There is another way to do this?

Anyone seen this error?

Thanks,

Rodolfo Barbeiro

rodolfobarbeiro

I'm alter my class JavaService

Change type of variable "org.activiti.engine.delegate.Expression" (Interface) to "org.activiti.engine.impl.el.JuelExpression" (Implementation) and the error mysteriously continues…


org.activiti.engine.ActivitiException: Incompatible type set on field declaration 'myService' for class org.myorg.bpmn.tasks.java.JavaService. Declared value has type org.activiti.engine.impl.el.JuelExpression, while expecting org.activiti.engine.impl.el.JuelExpression

org.activiti.engine.impl.el.JuelExpression != org.activiti.engine.impl.el.JuelExpression ????


It struck me that error can be ClassLoader. The ClassLoader of my application and Acitiviti may be different. Can this be?

I use the module "activiti-spring" to inject Activiti in my application, how can be loading in different classloader?


:?