topic Re: Autowired object(userService) is null within CustomTaskListener code in Alfresco Forum

Autowired object(userService) is null within CustomTaskListener code

paiyyavj13 — Fri, 05 May 2017 21:32:16 GMT

Hi,I am writing a custom TaskListener with the below code: I have hooked this TaskListener to Complete event of a User Task. I noticed that all the Autowired objects are null.I am not efficient in Spring, am I missing a step by which I can properly Autowire these objects? Please assist!Regards.Sampl

Re: Autowired object(userService) is null within CustomTaskListener code

cjose — Fri, 05 May 2017 23:34:07 GMT

Which version are you using?

Re: Autowired object(userService) is null within CustomTaskListener code

paiyyavj13 — Sat, 06 May 2017 14:46:16 GMT

Hi Ciju Joseph,

The versions are as below:

<activiti.version>1.5.3</activiti.version>
<activiti.engine.version>5.21.0.3</activiti.engine.version>
<spring.version>4.1.6.RELEASE</spring.version>

Deployment is on Alfresco Activiti Enterprise 1.5.3, tried the same with Activiti Process Services 1.6 too with same problem.

I was reading in the admin guide and community regarding bean injections into service task through expressions and JavaDelegate. But in my case it is a TaskListener... I am not quite sure how to go about it.

I read a community post: Injecting a Service in a TaskListener returns Null

where Dirla Vasile‌ mentions: "in order to have properly injected the services you should use expression or delegateExpression.
if you really need to use "class" for setting the listener, then you have to use Expression for the userService and evaluate it at runtime in the notify method."

Any pointers from your end would help!!!!

Appreciate your assistance..... Thank you....

Regards.

Re: Autowired object(userService) is null within CustomTaskListener code

cjose — Mon, 08 May 2017 14:01:33 GMT

I'm confused. Can you share a simple bpmn xml showing your Task Listener configuration? Otherwise, please find attached a simple process showing the use of task listener.

Ciju

Re: Autowired object(userService) is null within CustomTaskListener code

paiyyavj13 — Mon, 08 May 2017 15:20:19 GMT

Hi Ciju,

Your example bpmn xml helped me fix the problem.

I was calling the TaskListener by mentioning the class name and not through delegateExpression. Once I removed the class name and used delegateExpression alone then the Autowired Objects were initialized properly.

Sorry I couldn't explain it better.

Yet again... Thank you...

Regards.

Re: Autowired object(userService) is null within CustomTaskListener code

cjose — Mon, 08 May 2017 15:26:06 GMT

Bean injection won't work with "class". When you use Java Delegates, Task Listeners and Event Listeners it is important to understand the usage of "class", "delegate expression" and "expression". Check this out for more detailshttps://community.alfresco.com/community/bpm/blog/2016/11/15/activiti-enterprise-developer-series-service-tasks-java-delegates

Ciju