Migrate from Java 11 to Java 17 (Spring Boot 2.x path)

[devin-ai-integration]

Summary

Migrates the project from Java 11 to Java 17 while staying on Spring Boot 2.x (no javax → jakarta namespace changes needed).

Changes in build.gradle:

• sourceCompatibility / targetCompatibility: '11' → '17'
• Spring Boot: 2.6.3 → 2.7.18 (latest 2.7.x for best Java 17 support)
• mybatis-spring-boot-starter: 2.2.2 → 2.3.2
• graphql-dgs-spring-boot-starter: 4.9.21 → 5.5.1
• sqlite-jdbc: 3.36.0.3 → 3.42.0.1
• jjwt-*: 0.11.2 → 0.11.5
• joda-time: 2.10.13 → 2.12.7
• rest-assured (all modules): 4.5.1 → 5.3.2 (using enforcedPlatform BOM to prevent Spring Boot from downgrading transitive modules)
• mybatis-spring-boot-starter-test: 2.2.2 → 2.3.2
• Added --add-opens JVM flags for tests (Java 17 strong encapsulation)
• Upgraded Spotless plugin 6.2.1 → 6.25.0 (required for Java 17 module system compatibility with google-java-format)
• Overrode graphql-java.version to 19.2 (DGS 5.5.1 requires it; Spring Boot 2.7.18 BOM was forcing 18.5)

Changes in .github/workflows/gradle.yml:

• JDK: 11 (zulu) → 17 (temurin)
• setup-java: v2 → v3
• actions/checkout: v2 → v4
• actions/cache: v2 → v4 (v2 is deprecated and causes CI failures)

Spotless formatting:

• Applied google-java-format fix to DefaultJwtServiceTest.java (minor formatting change from upgraded formatter)

Review & Testing Checklist for Human

• Run ./gradlew clean build locally with JDK 17 to confirm all 68 tests pass
• Verify the application starts with ./gradlew bootRun and responds at http://localhost:8080/tags
• Spot-check that no javax.* imports were changed (they should all remain as-is since we stay on Spring Boot 2.x)
• Confirm DGS GraphQL endpoints still work end-to-end (the graphql-java version override from 18.5→19.2 is a key risk area)

Notes

• This is the lower-risk Option A (Java 17 + Spring Boot 2.x). No javax → jakarta namespace migration is needed.
• Three additional fixes were required beyond the original spec to get the build passing:
  1. Spotless 6.2.1 → 6.25.0: The old version couldn't access JDK compiler internals under Java 17's module system.
  2. graphql-java.version = '19.2': Spring Boot 2.7.18 manages graphql-java to 18.5, but DGS 5.5.1 requires 19.2.
  3. rest-assured enforcedPlatform BOM: Spring Boot's dependency management was downgrading rest-assured-common and spring-commons to 4.5.1 while the main rest-assured modules were at 5.3.2, causing NoSuchMethodError.
• The --add-opens flags are a standard workaround for Java 17's strong encapsulation with reflection-heavy libraries.
• CI action versions were bumped (checkout@v4, cache@v4, setup-java@v3) as cache@v2 is now deprecated and causes immediate CI failure.

Link to Devin session: https://app.devin.ai/sessions/bef4e524d6c74722bb26363cb5f761a6

[devin-ai-integration]

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