Issac Garcia focused on maintaining Java 9+ compatibility in the apache/calcite repository by resolving a dependency conflict related to the Java Platform Module System (JPMS). He identified and fixed an issue introduced by a new dependency, ensuring that Calcite remains stable and usable in modern Java module-based environments. Using his expertise in Java and dependency management, Issac implemented and verified the solution, which was committed to prevent future regressions. His work preserved enterprise-grade compatibility, strengthened continuous integration reliability, and supported future modular development, demonstrating a deep understanding of Java’s module system and the complexities of dependency resolution in large codebases.