System Error due to JCO communication failure? during mapping

in my JDBC-XI-Proxy scenario,
there is BPM with a transformation step,
in that step, during execution it gives Jco failure error, and particularly when the payload is very large....
my question is:
1.  how JCo communication failure occurs in case of mapping??
2. why its only when the payload is huge??

Sudheep,
1, The Mapping is alaways executed in the Java Stack. And so win the runtime there needs to be a connection between the ABAP stack and the Java Stack for the Mapping to get exectued. The TCP IP Connection AI_RUNTIME_JCOSERVER is used for this purpise in SM59.
2. When the payload is huge , there can be a over flow of the java Heap memory and this needs to be increased. Ask your Basis team to increase the java heap size if you do not want to face this issue.
Regards
Bhavesh

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