nav[aria-label="Primary Navigation"] { padding: 0; & ul { list-style: none; width: 100%; display: flex; flex-direction: row; justify-content: start; align-items: start; gap: 30px; padding: 0; & li { margin: 0; } & ul li { list-style: none; } } }

Spring boot application - Injecting HistoryService in a TaskListener returns Null

papalanisamy

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 !

Find more posts tagged with

Alfresco Process Services

Accepted answers

papalanisamy

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>

All comments

bassam_al-saror

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">

rupeshsawaliya

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

papalanisamy

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>

papalanisamy

Hi Rupesh,

Thanks for your prompt response.

We are using SPRING BOOT .

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

papalanisamy

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

rupeshsawaliya

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

bassam_al-saror

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.

papalanisamy

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>