How to know presence of a file in a commit using JGit? - jgit

I am trying to find JGit API which can help to know whether a file exists in a commit.
As described here, I think I can use RevWalk, RevCommit, and TreeWalk to solve this.
But, I am curious whether JGit has any in-built API support for this?
Thanks.

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How to re-register or override a grunt task?

I want to do something a little different than a grunt plugin we are using. How can I re-register a task?
I apologize if this is obvious or impossible. I've done quite a bit of searching on Google and SO, but I couldn't find anything.
I also tried using renameTask, but it says the package doesn't exist yet. I seem to have a misunderstanding of how grunt task registration works.
Update on specific use case
Specifically we want to extend the grunt-maven-tasks release task. At the current time we are unable to provide a pull request to update the project, so we were hoping we could override it from our grunt build.

Where does Phabricator store locales?

I'd like to rename phabricator's applications, such as Manifest, Phriction etc.
How can I do it? where can I find the values to edit? I have no idea where to check.
This is not supported, and we never plan to let you rename applications. If you're set on doing this, you'll have to fork the codebase.
With the latest update it is possible to rename the applications!

How do I parameterize flyway.properties to reference the user's home directory?

I'm trying to check into vcs a flyway.properties file that will work on all of the developers' machines. I need to parameterize flyway.properties, and can't figure out how. Maybe it isn't supported; please let me know.
Here are two properties I'm trying to set. You can see I'm using the Java user.home system property in an attempt to reference the user's home directory.
flyway.locations=filesystem:${user.home}/workspace/project-clone/sql
flyway.jarDir=${user.home}/.m2/repository/org/postgresql/postgresql/9.3-1101-jdbc41
Flyway seems to want sql and jars in its install directory, but that's not project specific, and I want my colleagues to like the tool, so please help me figure out how to make it one-liner easy.
This is currently isn't supported directly. You can however use symlinks to achieve this. If this doesn't satisfy your needs, please file a feature request in the issue tracker.

sqlite3, fmdb, build is failed

I'm using sqlite3, fmdb glad to know that, but try to use, build upon get errors. I do not know why. Gcc4.2 compilation options are used. (or LLVM GCC4.2). I need a good solution.
For those of you that might have this problem. Remove fmdb.m from your project and it will compile fine.

Creating a javadoc web from compiled jar library

I have a third-party library in the form of a jar containing only class files.
I'd like to be able to run javadoc (or some other tool) and generate a reference to the library API calls that I can make.
I know I'm not going to get many useful comments, but I'm not expecting that. I just want the auto-generated summary of the classes and calls.
What is the best way to go about doing this?
EDIT: As good as jad is, it doesn't generate perfect code. Consequently, javadoc complains. Is there any way to tell javadoc to ignore the errors and generate documentation as best as it can?
How about decompiling the classes and running javadoc on the output?
Try [jad](http://en.wikipedia.org/wiki/JAD_(JAva_Decompiler)).

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