Factory-bean 'processEngine' returned null

Camunda 7 Topics Discussion & Questions
1

I am trying to configure shared process engine for my new application running in Tomcat. The engine is started with bpm-platform.xml file placed in Tomcat conf folder.

The engine is starting successfully and I am able to see the below message in logs:

Camunda BPM platform sucessfully started at ‘Apache Tomcat/8.0.24’.

But then while trying to deploy the application on server,I get the following error.

16-Feb-2019 05:37:38.331 SEVERE [main] org.springframework.web.context.ContextLoader.initWebApplicationContext Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘repositoryService’ defined in ServletContext resource [/WEB-INF/applicationContext.xml]: factory-bean ‘processEngine’ returned null

Basically,I am trying to replicate this exercise.

Please advise.pom.xml (1.9 KB)

2

Hi,

Your pom.xml looks good.
Could you please share your applicationContext.xml and the initialization of repositoryService, I assume is in the Starter class of the exercise.

3

also here is more recent version of the guide:
https://docs.camunda.org/get-started/spring/service-task/

4

Hi Yana,

Thanks for responding. PFB the requested files.

applicationContext.xml (2.7 KB)
Starter.txt (1.1 KB)

5

Ok I will check this.

6

The repositoryService is not initialized in Starter and I assume that you’re using it in AllRunningProcessInstances so you just need to define it similar to runtimeService:

public class Starter implements InitializingBean {

  @Autowired
  private RuntimeService runtimeService;

  @Autowired
  private RepositoryService repositoryService;

  //...

  public void setRuntimeService(RuntimeService runtimeService) {
    this.runtimeService = runtimeService;
  }

  public void setRepositoryService(RepositoryService repositoryService) {
    this.repositoryService = repositoryService;
  }
}
7

Thanks Yana,that’s a good point.I implemented the same but now I get a different error even though I implemented JavaDelegate for AllRunningProcessInstances service.

19-Feb-2019 08:49:12.327 SEVERE [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.springframework.web.context.ContextLoader.initWebApplicationContext Context initialization failed
org.springframework.beans.factory.BeanCreationException: Error creating bean with name ‘org.camunda.bpm.getstarted.loanapproval.Starter#0’ defined in ServletContext resource [/WEB-INF/applicationContext.xml]: Invocation of init method failed; nested exception is org.camunda.bpm.engine.ProcessEngineException: Delegate expression {allRunningProcessInstances} did neither resolve to an implementation of interface org.camunda.bpm.engine.impl.pvm.delegate.ActivityBehavior nor interface org.camunda.bpm.engine.delegate.JavaDelegate

8

Could you please share AllRunningProcessInstances.

9

PFB

AllRunningProcessInstances.txt (1.8 KB)

10

Here is how to access process engine service via delegation code:
https://docs.camunda.org/manual/7.10/user-guide/process-engine/delegation-code/#access-process-engine-services

11

Hi Yana,

I followed all the correct steps but still getting same error.Your advice will be greatly appreciated.

19-Feb-2019 18:31:04.171 SEVERE [ContainerBackgroundProcessor[StandardEngine[Catalina]]] org.camunda.bpm.engine.impl.interceptor.CommandContext.close Error while closing command context
org.camunda.bpm.engine.ProcessEngineException: Delegate expression {allRunningProcessInstances} did neither resolve to an implementation of interface org.camunda.bpm.engine.impl.pvm.delegate.ActivityBehavior nor interface org.camunda.bpm.engine.delegate.JavaDelegate

Thanks

12

Hi Yana,

I resolved the above issue and it was due to a missing “$” while defining the delegate expression in bpmn diagram.

But,when I execute the below code.

package org.camunda.bpm.getstarted.loanapproval;

import org.camunda.bpm.BpmPlatform;
import org.camunda.bpm.engine.ProcessEngine;
import org.camunda.bpm.engine.RuntimeService;
import org.camunda.bpm.engine.delegate.DelegateExecution;
import org.camunda.bpm.engine.delegate.JavaDelegate;

public class AllRunningProcessInstances implements JavaDelegate {

public void execute(DelegateExecution execution) throws Exception {
	
	System.out.println("AllRunningProcessInstances Bean invoked now");
	// TODO Auto-generated method stub
	// get process engine and services
	
	ProcessEngine processEngine = BpmPlatform.getDefaultProcessEngine();
	RuntimeService runtimeService = processEngine.getRuntimeService();
}

}

I get the error:

20-Feb-2019 11:35:31.139 SEVERE [main] org.camunda.bpm.engine.impl.interceptor.CommandContext.close Error while closing command context
java.lang.NullPointerException
at org.camunda.bpm.getstarted.loanapproval.AllRunningProcessInstances.execute(AllRunningProcessInstances.java:25)

so looks like,the “processEngine” variable is null.Am I missing any configuration.

13

Hi,

Please see my last comment.
You are not fetching the runtimeService correctly in the delegation code.

14