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Is there a mercurial server written purely in Java?

I found libraries (Hg4J, JavaHg) but these libraries use the Python hg command. I'm searching for a library that provide functions like org.eclipse.jgit (example: org.eclipse.jgit.http.server.GitServlet and org.eclipse.jgit.transport.ReceivePack).

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The Hg4J project is a pure Java re-implementation of Mercurial — it does not require any other Mercurial installation. However, it's still a young project and the version 0.1.0 release only supports read-only operations.

You're correct that JavaHg requires a Mercurial installation. I'm one of the authors and we wrote it like that since it's the officially recommended way to interact with a Mercurial repository from another language. We get all the benefits of new Mercurial versions for free and we have a full read/write API.

I agree that a pure Java version is interesting and I wish the Hg4J project good luck. But I also hope it isn't too difficult to install Mercurial to use JavaHg.

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Yep, you're right. The hg4j project is a pure Java re-implementation, but many of features not implement yet.
hmm, if I want save all mercurial repository objects in DB(like jgit-mongodb), I must be write python code(gasp).

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