topic Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null in Alfresco Forum

Spring boot application - Injecting HistoryService in a TaskListener returns Null

papalanisamy — Thu, 17 May 2018 10:30:09 GMT

I am working in a spring boot application. when i try to call tasklistener class, The autowired historyservice is returning null. process service‌ tasklistener Can anyone please help !

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

bassam_al-saror — Thu, 17 May 2018 11:52:28 GMT

TaskListeners that are set in 'class' attribute are created/instantiated by the engine so Spring autowiring will not work.

<activiti:taskListener event="complete" class="example.MyTaskListener">

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

rupeshsawaliya — Thu, 17 May 2018 12:20:39 GMT

Hi,

As Bassam Al-Sarori‌ mentioned task listeners are basically bind in context of task and workflow so it should be set in your workflow tasks, not separated wired as a spring bean .

Regards,

Rupesh

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

papalanisamy — Thu, 17 May 2018 12:35:53 GMT

Hi Bassam,

Thanks for your prompt response.

Here is my code. any changes to be done for this.

public class TestClass implements TaskListener {

  @Autowired
  private HistoryService historyService;
  public void notify(DelegateTask delegateTask) {
    String currentEvent = delegateTask.getEventName();
    if("delete".equalsIgnoreCase(currentEvent))
      return;
    try {


      System.out.println(historyService);// it returns null, please let us know the workaround

      }
  }


  XML File :


        <activiti:taskListener event="all" class="com.callback.TestClass"></activiti:taskListener>

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

papalanisamy — Thu, 17 May 2018 12:36:35 GMT

Hi Rupesh,

Thanks for your prompt response.

We are using SPRING BOOT .

Here is my code. any changes to be done for this.

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

papalanisamy — Thu, 17 May 2018 12:38:08 GMT

this is spring boot application. anything specific for springboot ??

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

rupeshsawaliya — Thu, 17 May 2018 12:58:08 GMT

Hi,

Here i think you may have to depends-on attribute on task listener class the way it is added in following bean definition.

I think this will help you.

Regards,

Rupesh Sawaliya

EnProwess Technologies

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

bassam_al-saror — Thu, 17 May 2018 13:41:31 GMT

You can try registering your task listener as a spring bean (i.e. using @Component) and use an expression to call it.

<activiti:taskListener event="all" expression="${myTaskListener.notify(execution)}" />

By the way, it could be any class (spring bean) doesn't have to implement TaskListener.

Re: Spring boot application - Injecting HistoryService in a TaskListener returns Null

papalanisamy — Thu, 17 May 2018 14:23:45 GMT

Thanks both of you..

Finally the issue is solved by passing the listener in delegate expression instead of class .

<activiti:taskListener event="all" delegateExpression="${TestClass}"></activiti:taskListener>