Java's equivalent for Biztalk server ... ???

[Sajith Hasanka]

Hi all,
Im not very sure whether this is the correct category for posting the question i have.

I would like to know is there any equivalent for MS' Biztalk Server, in Java??

Im familiar with Java technologies, and no idea of Biztalk server. Found that Biztalk server is a business process management (BPM) server. (According to wiki)
So, curious to know whether that can be used irrespective of technology(Java or .NET) .. or else, what are the BPM servers available for Java platform??

Thanks

[Maneesh Godbole]

http://java-source.net/open-source/workflow-engines