As the tools for debugging embedded JavaScript (whether individual opbindings or as part of a completely scripted connector) are not currently offered as part of the Rhino project, a number of methods like ScriptStyleOpProxyHandler.debug(String message, Object obj, boolean dumpStack, int pos) have been added.
These methods let you can invoke them from your script and therefore allow you to put breakpoints on these methods and analyze state during script execution. In addition to acting as potential breakpoint targets, these methods also output tracing output.
The "pos" parameter is intended to allow you to flag related calls with the same value, and allow triggering of conditional breakpoints so that calls which are not interesting during a debugging run are easily skipped.
You can try this approach for setting breakpoints out against the SDKSCRIPT connector which includes example debug calls.
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