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Java 8 to 21 on a batch full of traps I planted: the code-modernization plugin, end to end

I ran Anthropic's code-modernization plugin for Claude Code headless on a 2006-style billing batch I had booby-trapped. It caught every trap, found four problems I hadn't planted, and still only called its own proof "partly proven".

14 Oct 2026 · 8 min read ·14 views

#claude-code
#java
#modernization
#testing