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$ hg pull # make sure the default branch has latest changes
$ hg update "JDK-7000001"  # make sure you are sitting on your branch
$ hg merge default 
$ hg commit
$ hg push

How should I push a branch?

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$ hg update -C "JDK-7000001"
$ hg commit --close-branch -m "Closing branch"
$ # Update repo to another branch to avoid mistakenly re-opening the closed branch.
$ hg update default
$ hg push 

How can I see my open branches? 

Do the following:

$ hg log -r "heads(all()) and not closed() and user('<user>') and not branch(default)"

How can I show all changes for my branch?

To see all the changes for a branch named "JDK-4040458" you can do this:

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