Worked on enhancing Java build reliability in the bazelbuild/bazel repository by introducing an experimental classpath option called bazel_no_fallback. This feature enforced compilation with a reduced Java classpath, causing builds to fail if dependencies were missing, rather than reverting to the full transitive classpath. The approach improved error visibility and determinism in Java projects, supporting more reliable continuous integration workflows. Expanded test coverage for released java_tools to validate the new behavior, ensuring robust enforcement of the reduced classpath. The work involved Java and Shell scripting, leveraging skills in build systems, compiler design, and testing to address dependency management challenges.