You have two options, each with its pros and cons:
Option 1. Extract payload from process instance data (i.e. "cube instance")
- Lookup instance handle using conversation Id or instance Id
- Call the com.oracle.bpel.client.IInstanceHandle.getField("bpelVariableName") API to get the payload. If the variable is a message type, the returned object is a Map and you can get the Element via map.get("partName"). If the variable is an element type, the returned object is an Element object.
- If your BPEL process change the value of the input variable, this API It will get the latest value, not the initial one.
- It may not be able to get the variables from the faulted instances. It may only work with successful instances
Option 2. Extract payload from audit trail
- Lookup instance handle using conversation Id or instance ID
- Fetch audit trail from instance handle using IInstanceHandle.getAuditXXX() API
- Use substring functions to extract initiating payload
- You need to do your own parsing of XML in order to extract the initial payload
- If you use auditLevel to dial down the audit trail to a certain degree, or even totally suppress it, you may not be able get the payload from audit trail