How to get controller service in Script Executor

[oppo]

Hi, 


I try to use javascript in processor to do some enrichment and transformation, 
but i don't know how to concat the service identifier. 
As it is ExecutorScript processor, I can't add a service reference in 
properties, I can only add service in current Group (I put logic in one Process 
Group), I have name and id of service, I enable the service. 


See the following code:


var enrichmentService = 
context.getControllerServiceLookup().getControllerService("DBCPConnectionPool");
if(enrichmentService == null) {
    log.warn("Can't find DBCPConnectionPool");
    session.transfer(flowFile, REL_FAILURE);
}



It always jump to null condition. 


Anyone can help? 


Kui