topic Re: issue with bean acces in service task in Alfresco Archive

issue with bean acces in service task

mdaviot — Wed, 10 Oct 2012 16:52:22 GMT

Hello,I have been stuck all day with this issue… your help would be really welcome.I have a simple process DemoErrorManagement with a service task implemented as an expression which refers to a bean : myService, speficied with the interface Service1.In my unit test I inject the bean myService which

Re: issue with bean acces in service task

frederikherema1 — Thu, 11 Oct 2012 13:20:42 GMT

I see you're using the SpringProcessEngineCOnfiguration. So the full spring-context is available to use in your expressions. So "myService" should just work.

Can you try adding the bean to the "beans" property in activiti configuration;


<property name="myService">
    <map>
      <entry key="myService" value-ref="myService" />
    </map>
  </property>

Re: issue with bean acces in service task

mdaviot — Thu, 11 Oct 2012 15:14:57 GMT

Hi and thanks for looking into this.

I'm really not a spring expert … I tried to add this property under beans element

org.xml.sax.SAXParseException: cvc-complex-type.2.4.a: Invalid content was found starting with element 'property'. One of '{"http://www.springframework.org/schema/beans':import, "http://www.springframework.org/schema/beans':alias, "http://www.springframework.org/schema/beans':bean, WC[##other:"http://www.springframework.org/schema/beans"], "http://www.springframework.org/schema/beans':beans}' is expected.

and under bean id="processEngineConfiguration" –>

org.springframework.beans.NotWritablePropertyException: Invalid property 'myService' of bean class [org.activiti.spring.SpringProcessEngineConfiguration]:

Where should I define this property ? And should it be defined for any bean I want to use from service tasks ?

Regards,
Michel

Re: issue with bean acces in service task

frederikherema1 — Fri, 12 Oct 2012 06:59:29 GMT

whoops.. should have been "beans" under "processEngineConfiguration":


<property name="beans">
    <map>
      <entry key="myService" value-ref="myService" />
    </map>
  </property>

Re: issue with bean acces in service task

mdaviot — Fri, 12 Oct 2012 07:55:15 GMT

OK, this time the spring configuration is recognized, but it does not solve my issue at all.


<bean id="myService" class="net.atos.cetelem.service.impl.DemoService" />

<bean id="processEngineConfiguration" class="org.activiti.spring.SpringProcessEngineConfiguration">
  <property name="history" value="full" />
  <property name="dataSource" ref="activitiDataSource" />
  <property name="transactionManager" ref="activitiTransactionManager" />
  <property name="databaseSchemaUpdate" value="true" />
  <property name="jobExecutorActivate" value="false" />
  
  <property name="beans">
  <map>
   <entry key="myService" value-ref="myService" />
  </map>
 </property>
 </bean>

Would you try to reproduce it on your environment ? You just have to launch net.atos.cetelem.StartProcess, it uses an H2 DB.

org.activiti.engine.ActivitiException: Unknown property used in expression
 at org.activiti.engine.impl.el.JuelExpression.getValue(JuelExpression.java:55)
…
Caused by: org.activiti.engine.impl.javax.el.PropertyNotFoundException: Cannot resolve identifier 'myService'
 at org.activiti.engine.impl.juel.AstIdentifier.eval(AstIdentifier.java:83)

Re: issue with bean acces in service task

frederikherema1 — Fri, 12 Oct 2012 07:56:34 GMT

There is no file attached to your comment, please upload it somewhere on the web instead…

Re: issue with bean acces in service task

mdaviot — Fri, 12 Oct 2012 08:24:31 GMT

Project is available here : http://dl.dropbox.com/u/21035474/DemoErrorMgt.zip (as stated in the first post)

Re: issue with bean acces in service task

frederikherema1 — Fri, 12 Oct 2012 08:41:58 GMT

I see your problem now, it's the way you fetch your process-engine. You're using "ProcessEngines.getDefaultProcessEngine()", this will only read the "processEngines" bean from the activiti.cfg.xml-file.

If you want to use spring, you have to:

Use org.activiti.spring.SpringProcessEngineConfiguration (which you are doing, so that's fine)

Create the ApplicationContext yourself (e.g.. by using Spring's servletContextListener or by creating a XMLClassPathApplicationContext)

Retreive the bean "processEngine" manually and use this INSTEAD of ProcessEngines.getDefaultProcessEngine()

Re: issue with bean acces in service task

mdaviot — Fri, 12 Oct 2012 11:29:08 GMT

Thanks a lot, you solved the issue for me !!

For the record, here is the working code if anyone is interested :


public class StartProcess {

  private static final ApplicationContext ac= 
          new ClassPathXmlApplicationContext("activiti.cfg.xml");
 
 static ProcessEngine processEngine = ac.getBean(ProcessEngine.class);

 public static void main(String[] args) {
  RepositoryService repositoryService = processEngine.getRepositoryService();
  repositoryService.createDeployment().addClasspathResource("diagrams/DemoErrorManagement.bpmn20.xml").deploy();
  processEngine.getRuntimeService().startProcessInstanceByKey("DemoErrorManagement");

 }

}

Re: issue with bean acces in service task

mdaviot — Fri, 12 Oct 2012 11:30:28 GMT

Note : this step is not required at all.

whoops.. should have been "beans" under "processEngineConfiguration":

<property name="beans"> <map> <entry key="myService" value-ref="myService" /> </map> </property>

Re: issue with bean acces in service task

frederikherema1 — Fri, 12 Oct 2012 12:14:45 GMT

Indeed, it's only required if you want to limit the visibility of the whole spring-context ion expressions….