topic Re: can't access to bpm_package childrens in a ExecutionListener in Alfresco Archive

can't access to bpm_package childrens in a ExecutionListener

jpmerlin — Wed, 05 Nov 2014 10:11:43 GMT

Hi,I'm with Alfresco community 4.2.c and activiti 5.10-alf.20121114.I have a problem when i want to access to bpm_package content in a executionListener.I've got a NPE on org.alfresco.repo.jscript.ScriptNode.getChildren() function.I have not this problem with a taskListener.Here is a simple process

Re: can't access to bpm_package childrens in a ExecutionListener

afaust — Wed, 05 Nov 2014 12:14:00 GMT

Hello,

this is a result of you working with (Activiti)ScriptNode outside of a Rhino/JavaScript context. All operations in (Activiti)ScriptNode require a runtime context to be set, which Alfresco automatically does when you use a script-based listener. When you want to access (Activiti)ScriptNode manually from Java, you need to wrap the entire code block in a try-finally construct and do

Context.enter();‍

before the block and

Context.exit();‍

within the finally block. You also need to perform a

bpmPackage.setScope(scope);‍

call where

scope‍

is an object you obtain via

Context.initStandardObjects();‍

.

Of course, it would be far simpler to either just use a script-based listener or extract the NodeRef via

bpmPackage.getNodeRef();‍

and use regular NodeService etc. instead of ScriptNode API (

getNodeRef()‍

does not require a Rhino/JavaScript context).

Regards
Axel

Re: can't access to bpm_package childrens in a ExecutionListener

jpmerlin — Wed, 05 Nov 2014 15:59:55 GMT

Thank you for your response !
I use the second method with NodeService and bmpPackage.getNodeRef().
What suprise me is that it works fine with a java TaskListener, the context is not initialize the same way in a TaskListener than in a ExecutionListener.

here is the code of the ExecutionListener :


public class TestExecutionListener implements ExecutionListener {
   
   private static Log logger = LogFactory.getLog(TestExecutionListener.class);
   
   
   @Override
   public void notify(DelegateExecution execution) throws Exception {
      
      
      ActivitiScriptNode  bpm_package = (ActivitiScriptNode) execution.getVariable("bpm_package");
      if (bpm_package == null){
         logger.error("le bpm_package est null");
      } else {
         NodeRef packageNodeRef = bpm_package.getNodeRef();
         NodeService nodeService = getServiceRegistry().getNodeService();
      
      
         List<ChildAssociationRef> children = nodeService.getChildAssocs(packageNodeRef);
          for (ChildAssociationRef childAssoc : children) {
              NodeRef childNodeRef = childAssoc.getChildRef();
              logger.error("Noderef of child : " + childNodeRef.getStoreRef().getProtocol()+"://"+childNodeRef.getStoreRef().getIdentifier()+"/"+childNodeRef.getId());
          }
      
      }

   }


   
   protected ServiceRegistry getServiceRegistry() {

        ProcessEngineConfigurationImpl config = Context.getProcessEngineConfiguration();

        if (config != null) {

            // Fetch the registry that is injected in the activiti spring-configuration
            ServiceRegistry registry = (ServiceRegistry) config.getBeans().get(ActivitiConstants.SERVICE_REGISTRY_BEAN_KEY);

            if (registry == null) {

                throw new RuntimeException(

                            "Service-registry not present in ProcessEngineConfiguration beans, expected ServiceRegistry with key" +     ActivitiConstants.SERVICE_REGISTRY_BEAN_KEY);
            }
            return registry;
        }

        throw new IllegalStateException("No ProcessEngineCOnfiguration found in active context");

    }
}
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thank you.

Jean-Paul