You can deploy BPEL processes developed in WS-BPEL 2.0 standard on WSO2 BPS server . Once you deploy the BPEL process on WSO2 Business Process Server, you can use following mechanisms to debug/troubleshoot failures.
Unfortunately, the open source tools for BPEL debugging are very limited. Although ODE provides APIs to suspend and resume processes at break points, the current tools don't make use of it. I'd recommend to enable the DebugBpelEventListener, which outputs the execution events to the configured logger.
This usually helps to understand what is going on.
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