Error Injecting Beans in Java Service Task

[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>

…
‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍‍

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?


:?