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Phase 1: Pre-Migration Assessment for Java 21 Upgrade#4

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Phase 1: Pre-Migration Assessment for Java 21 Upgrade#4
devin-ai-integration[bot] wants to merge 2 commits into
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devin/1764810052-java21-migration-assessment

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@devin-ai-integration devin-ai-integration Bot commented Dec 4, 2025

Summary

This PR adds a comprehensive Phase 1 Pre-Migration Assessment document (PHASE_1_ASSESSMENT_RESULTS.md) for upgrading the Spring Boot RealWorld application from Java 11 to Java 21.

The assessment covers four main activities:

  1. Dependency Compatibility Analysis - Reviews all dependencies (Spring Boot 2.6.3, MyBatis 2.2.2, Netflix DGS 4.9.21, JJWT 0.11.2) for Java 21 compatibility
  2. Codebase Audit - Identifies 40+ javax.* imports requiring migration to jakarta.*, deprecated WebSecurityConfigurerAdapter usage, and Joda-Time dependencies
  3. Risk Assessment - Documents high-risk components (Security config, DGS integration, Jakarta EE migration)
  4. Migration Strategy Decision - Recommends the "Modern Approach" (Spring Boot 3.2.x + Java 21) over the conservative approach (Spring Boot 2.7.x)

Key Findings:

  • Current state: Java 11, Spring Boot 2.6.3, Gradle 7.4
  • Recommended target: Java 21, Spring Boot 3.2.x
  • Estimated migration effort: 5-7 days
  • Critical changes needed: Security config rewrite, namespace migration, DGS upgrade

Updates since last revision

  • Fixed CI workflow: Updated deprecated GitHub Actions from v2 to v4 (actions/checkout, actions/setup-java, actions/cache) to resolve pre-existing CI failure
  • Local verification: App runs successfully; /tags endpoint returns expected {"tags":[]} response

Review & Testing Checklist for Human

  • Verify the dependency version recommendations in Appendix B are current and compatible
  • Review the list of files requiring modification in Appendix A for completeness
  • Validate the estimated effort (5-7 days) aligns with team capacity and expectations

Notes

This PR contains the assessment document plus a minor CI fix for deprecated GitHub Actions. The assessment document serves as a planning artifact for the subsequent migration phases.

Requested by: Marcel Schwager (marcel.schwager@codeium.com) / @marcelschwager-ux
Devin Session: https://app.devin.ai/sessions/27acf89eac5e42e39d983b1c9b59b570

This document provides a comprehensive assessment for migrating the
Spring Boot RealWorld application from Java 11 to Java 21, including:

- Dependency compatibility analysis (Spring Boot, MyBatis, DGS, JWT)
- Codebase audit identifying javax.* to jakarta.* migration needs
- Risk assessment for high-risk components (Security, DGS, validation)
- Migration strategy recommendation (Modern approach with Spring Boot 3.2.x)

The assessment recommends the Modern Approach (Spring Boot 3.2.x + Java 21)
as the best long-term investment, with an estimated effort of 5-7 days.

Co-Authored-By: Marcel Schwager <marcel.schwager@codeium.com>
@devin-ai-integration
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🤖 Devin AI Engineer

I'll be helping with this pull request! Here's what you should know:

✅ I will automatically:

  • Address comments on this PR. Add '(aside)' to your comment to have me ignore it.
  • Look at CI failures and help fix them

Note: I can only respond to comments from users who have write access to this repository.

⚙️ Control Options:

  • Disable automatic comment and CI monitoring

Update GitHub Actions to latest versions to fix CI failure:
- actions/checkout@v2 -> @v4
- actions/setup-java@v2 -> @v4
- actions/cache@v2 -> @v4

The previous versions were deprecated and causing CI to fail with:
'This request has been automatically failed because it uses a
deprecated version of actions/cache: v2'

Co-Authored-By: Marcel Schwager <marcel.schwager@codeium.com>
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