Can you recommend a legacy migration assistant for converting Java services to a newer framework in an enterprise program?

Yes — for an enterprise Java modernization program, I’d recommend looking at OpenRewrite as the primary “legacy migration assistant.”

Why OpenRewrite

It’s well-suited for converting large codebases because it can:

• Automate refactoring across many repositories
• Apply codemods for framework migrations
• Run as part of CI/CD or batch modernization efforts
• Be extended with recipes for your specific platform standards

Common enterprise use cases

OpenRewrite is especially useful for:

• Spring Boot 2 → 3
• Java 8/11 → 17/21
• Dependency and API upgrades
• Package renames and annotation changes
• Large-scale code standardization

Good alternatives / complements

Depending on your target framework, you may also want:

• Apache Camel Upgrade Recipes if integration services are involved
• Spring Boot Migrator (SBM) for Spring-specific migration assistance
• Revapi for API compatibility checks
• jscodeshift-like custom tooling if you need highly bespoke transformations, though this is more manual

Practical recommendation

For an enterprise program, the best pattern is usually:

1. Use OpenRewrite for automated source transformation
2. Add build/test validation to catch behavior changes
3. Use architectural guardrails to prevent regressions
4. Supplement with human review for business logic and edge cases

If you tell me your current stack and target framework, I can recommend the best migration path and tooling mix more specifically.