Exception while sync event

Question

I'm trying to write a simple program that performs a generic sync and I keep getting the following error.
The backend method I'm trying to call requires no parameters and returns and outbound container with a few DESCRIPTION registers.
Exception while sync event processing: null (java.lang.RuntimeException)
The code that fires up the sync is:
ClassLoader cl = getClass().getClassLoader();
OpportunitySourceDAL ip = new OpportunitySourceDAL(); InboundProcessorRegistry.getInstance().register(ip);
OutboundContainerFactory outfactory = OutboundContainerFactory.getInstance();
outfactory = OutboundContainerFactory.getInstance();
OutboundContainer out = outfactory.createOutboundContainer(VisibilityType.SEPARATED, "ZLISTA_SOURCES_ALIAS" , OutboundContainer.TYPE_REQUEST);
out.close();
SyncManager.getInstance().synchronizeWithBackend(VisibilityType.SEPARATED);
And the class OpportunitySourceDAL has a process method like this
public void process(InboundContainer inbound) {
try {
  OpportunitySource op = OpportunitySource.getInstance();
  InboundContainerElement[] sources= inbound.getElementsWithFieldName("DESCRIPTION");
  for (int i = 0; i < sources.length; i++)
  op.add( sources.getFieldValue() );
} catch (Exception e) {
I've already created the wrapper for the backend function using ME_WIZARD and checked that it works with ABAP debugger.
The backend function is in the same machine as was so I don't have to map an RFC destination.
Am I missing some steps?
Thanks in advance.

Answer 1

Hi ,
  Please check the following
1. The MI forms the outbound container and when you fire event synchronizeWithBackend these containers are serialized and sent to middleware and then to backend.
Please check that OutboundContainer out is not null.
2. Also see whether ht emapping b/w the backend table and the frontend tabkle is correct.
3. In case you are not able to crack error. attach the complete trace file.
regards
anubhav