jBPM and any other toolkits, processes and languages should be under the skills section. Since jBPM is a toolkit, you can include it in your skill sections. If you want to highlight certain skills, use categories to showcase your skills. For example, like technical skills, hard skills and soft skills. Or you could divide it, like programming skills, language skills, soft or interpersonal skillsYou can categorize your skills section by areas, like technical skills, hard skills and soft skills, or keep them all together in one list.
If you reached an important accomplishment with jBPM, you can list it under your work history or expand on it in a cover letter.