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AI migrated legacy COBOL programs to Java, bugs included
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Overview
The "Locksmith Loop" is a novel agentic test-synthesis method designed for deterministic validation of legacy COBOL code migration to Java. It addresses challenges in testing by generating test cases to ensure correct functionality despite limited test data and complex corner cases.
Summary from arxiv.org.
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Hacker News · arxiv.org
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Based on 5 sampled comments from this thread. Analyzed 2026-08-03.
- Praise: Using AI to translate COBOL brings extra understanding, which could help demystify legacy systems that are often seen as black boxes.
- Praise: There’s a chance that AI could write tests and prompt a better architecture, potentially making it easier for teams to work on legacy codebases.
- Concern: The idea that a one-shot migration from COBOL to Java won't introduce a massive number of bugs is naive; AI's non-determinism could lead to a plethora of new issues.
- Concern: An AI rewrite doesn’t solve the fundamental problems of legacy systems; it just creates a new one that no one understands.
- Concern: Rewriting COBOL with AI doesn't address the complexities of job control and other mainframe dependencies that simply don't translate to Java.