What I did was to copy the whole folder into the workspace,
start a new java project with the same name,
upon seeing the jbpm source folder already in the workspace, eclipse will attempt to build a project out of it.
But there will be many errors due to missing jars that you will have to hunt down and add externally.
In my case, even after adding in the jars, there were errors with the examples in jBPM, but I didn't want to use them, and so could ignore them.
Good luck :)
Yes, I did the same as you, but there will be some problems when you want to debug something in eclipse project constructing like this. A dialog will show say that can not set up the break point because missing line number.
Thank you very much!