Analyzes legacy PL/I (Programming Language One) programs to assist with migration to modern Java applications. Extracts business logic, data structures, procedure definitions, and file operations from PL/I code. Generates migration reports and creates Java implementation strategies. Use when working with mainframe migration, PL/I analysis, legacy system modernization, or when users mention PL/I to Java conversion, analyzing .pli/.PLI/.pl1 files, working with PL/I procedures, or planning Java service implementations from PL/I programs.