jBPM bpmn designer validation errors

Ok, you must agree with me on this one. It is not nice to develop in environment where you get an errors on unknown location. Well, errors are fine, it is part of software development, but when you are not able to see any details of where the error comes from, it gets to waste enormous amount of time to dig out why such error happens.

I got such errors when I try to use jBPM eclipse environment to try implementing BPM process using an external bpmn file. Since bpm is created in one of those graphical eye-candy oriented BPM modelling software (with little or no support for bpmn validation), I could imagine there are some  pieces (details) missing within bpmn.

No Interface found - According to BPMN standard, every Service Task needs to be defined with a proper service operations. If such is not defined for any of the service tasks within your bpm file, you will get this error.

No Item definitions found - tbd.

If I come up to some more of these errors, I will add them here...

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