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In my daily work, I have to deal with legacy frameworks. Here are 6 tips that I summarized for bug-fixing, including documentation, searching, testing, patching library and more.

Simple but common use-cases: create options, create option, parse command line arguments, print usage, and more using Apache Commons CLI.

Create a Git hook prepare-commit-msg for inferring JIRA ticket as commit message prefix, based on the branch name.

Fun experience on fixing a custom comparator by identifying the sub-problems, testing different combinations, and finally fix it.

Use option "maven.repo.local" to specify the Maven local repository path.

Listing files inside a JAR or displaying content of a single file using different commands: "jar", "unzip", or "vim".

Glob expression syntax, and its usage in Java through Path Matcher and Directory Stream.

Character mapping between ISO-8859-1 / UTF-8, decode and encode data between string and bytes, and file I/O operations including MIME encoding detection. All examples are written in Java and Python 3.