topic Using spring @Autowire in ExecutionListener not working in Alfresco Archive

Using spring @Autowire in ExecutionListener not working

davidwaf — Tue, 28 Jun 2011 21:52:13 GMT

Hi all,I have a web app, that among other things, is using Activiti for BPM. What i did is dropped these into the classpath:activiti-engine-5.6.jaractiviti-spring-5.6.jarThen, my spring-activi config is as follows[size=85]<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.sprin

Re: Using spring @Autowire in ExecutionListener not working

davidwaf — Tue, 28 Jun 2011 23:32:13 GMT

Ok, i abandoned the whole idea of autowiring directly in ExecutionListener, opted to use field injection, which gives me access to the beans. And that works fine.

Re: Using spring @Autowire in ExecutionListener not working

divakar — Tue, 24 Mar 2015 12:14:22 GMT

HI David,

Can you give me the sample expression for field injection for the above scenarios stated, so that we are able to access mailService, propertyService beans in the notify method.

I have a web application, that uses annotations for defining beans. When i tried to use an AutoWired bean in an ExecutionListener, i get only Null reference. Process Definition and Code of the ExecutionListener is given below

Excerpt from Process definition BPMN file
———————————–
<sequenceFlow id="toFinanceReview" name="Goes To Finance Review" sourceRef="exclusivegateway1" targetRef="financeReview">
      <extensionElements>
        <activiti:executionListener event="take" class="edu.divakar.handlers.EmailListener"></activiti:executionListener>
      </extensionElements>
      <conditionExpression xsi:type="tFormalExpression"><![CDATA[${managerDecision == 'approve'}]]></conditionExpression>
    </sequenceFlow>
===============================================================================

public class EmailListener implements ExecutionListener {

    @Autowired
    EmailService emailService;

    @Override
    public void notify(DelegateExecution arg0) throws Exception {
        Map<String, Object> processVariableMap = arg0.getVariables();
        emailService.sendEmail(processVariableMap); //HERE I GET ONLY NULL
    }
}

Thanks in advance.

Re: Using spring @Autowire in ExecutionListener not working

jbarrez — Tue, 24 Mar 2015 13:54:35 GMT

That original post is from 2011 …

Anyway.

class="edu.divakar.handlers.EmailListener"> is NOT a spring bean. @Autowired is never going to work on a non-spring bean. Your emailListener needs to be a Spring bean too to make it work.

Re: Using spring @Autowire in ExecutionListener not working

divakar — Wed, 25 Mar 2015 04:50:09 GMT

Hi Joram,

Activiti is awesome and great to receive an reply from you.

I am new to Spring. I have annotated the above EmailListener class with @Component and defined a method in my config class as follows
@Bean
    public EmailListener getEmailListener() {
        return new EmailListener();
    }

Now, my question is, to make activiti take this spring bean, how should i define it in the process definition. I tried the following but none worked.

<activiti:executionListener event="take" class="${emailListener}"></activiti:executionListener>
<activiti:executionListener event="take" class="#{emailListener}"></activiti:executionListener>
<activiti:executionListener event="take" expression="${emailListener}"></activiti:executionListener>
<activiti:executionListener event="take" expression="#{emailListener}"></activiti:executionListener>

I guess i am missing something silly. Please bear with me and give me the solution. Thanks.

Re: Using spring @Autowire in ExecutionListener not working

trademak — Thu, 26 Mar 2015 07:34:05 GMT

Hi,

It can only work with an expression or delegateExpression attribute. But the expression attribute should also contain the method you want to invoke. So something like ${emailListener.notify(execution)}

Best regards,

Re: Using spring @Autowire in ExecutionListener not working

divakar — Fri, 27 Mar 2015 03:35:50 GMT

Hi Thanks. Actually my problem was activiti was using a different context, which was not having the emailListener bean. However once i set the application context in my SpringProcessEngineConfiguration and in ProcessEngineFactoryBean, it worked fine.

Thanks for the help too.