Is it possible to integrate JIRA with mercurial (without fisheye)?

I'm setting up a development server with JIRA a开发者_C百科s issue tracker and mercurial as SCM.

Is it possible to relate commits with the JIRA's issues (without using fisheye or any commercial tool)?

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Yes, the JIRA Mercurial plugin does this, just like the JIRA Subversion plugin does for Subversion. It needs an update for 4.3 though, I must get around to that.