You can use the environment with runtime created by installing jBPM.
Your Eclipse should also contain tools to develop jBPM projects:
Approach based on sources
Creating examples I prefer usage of sources (presently version 6.5.0.Final) and above Eclipse configuration:
- dedicate maven repository to my example projects (sources jBPM 6.5.0.Final)
- install artifacts: mvn install -DskipTests
- setup example project based on that repository.