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Learn how to track changes in your Java project using Git after a bug fix commit, leveraging the power of `jgit` for efficient version control.
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This video is based on the question https://stackoverflow.com/q/64942354/ asked by the user 'fabianod' ( https://stackoverflow.com/u/11452928/ ) and on the answer https://stackoverflow.com/a/64942471/ provided by the user 'Otacílio Maia' ( https://stackoverflow.com/u/8441509/ ) at 'Stack Overflow' website. Thanks to these great users and Stackexchange community for their contributions.

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How to Identify Modified Files After a Bug Fix in Git Using jgit

In the world of software development, tracking changes and understanding modifications is crucial, especially when it comes to fixing bugs. If you're working on a Java project and managing your versioning through Git, you may find yourself needing to figure out which files were altered in a specific commit that fixed a bug. This guide will guide you step-by-step in understanding how to accomplish that using Git commands and the jgit library.

Understanding the Problem

Imagine you've recently fixed a bug in your Java project, and now you need to review the changes made during that specific update. You've already identified the commit that fixed the bug, but the next step is to determine which files were modified in that commit. This can greatly help you understand the impact of the fix and verify if additional tests are required on the modified files.

The question now is: How do you identify modified files from a given commit?

The Solution Overview

The solution lies in using the Git command-line interface to compare commits. Specifically, the git diff command allows you to view the changes between two commits. Below, we'll break down the process into easy-to-follow sections.

Using git diff Command

To find out the files modified between two commits, you'll primarily use the git diff --name-only command. This command will display only the names of modified files, helping you focus on what matters most.

Comparing the Latest Commits

If you want to compare the changes in the last few commits, you can easily do so by using the HEAD reference. For example, to check what changed in the last five commits, you can run:

[[See Video to Reveal this Text or Code Snippet]]

Here, HEAD refers to the latest commit, and HEAD~5 denotes the fifth commit before the latest one.

Comparing Specific Commits

If your focus is on a particular commit (for instance, the commit that fixed the bug), you use the commit hash to compare it with its preceding commit. The command would look like this:

[[See Video to Reveal this Text or Code Snippet]]

In this command, replace 8614c3d70397f03ab504de8d23e8255d52fa3ed1 with the hash of the commit you're interested in.

For Your Application Specifically

Now that we have a general understanding of how to use git diff, let's focus on your application needs. If you're looking to check the files changed in a specific commit, you can do so using the same logic:

[[See Video to Reveal this Text or Code Snippet]]

For example, if the bug fix commit has the hash 8614c3d70397f03ab504de8d23e8255d52fa3ed1, the command to check the files changed would be:

[[See Video to Reveal this Text or Code Snippet]]

Conclusion

By following the above steps and utilizing the powerful git diff command, you can effectively track and identify which files were modified in a specific commit related to bug fixes in your Java project. This ability not only helps in debugging but also in maintaining a well-organized version control system.

Utilizing jgit makes this process even smoother when integrating with your Java applications. Happy coding!