Task 2: Upgrade Spring Boot 2.7.18 and Java 17

[devin-ai-integration]

Summary

Upgrades the FTGO monolith from Spring Boot 2.0.3 → 2.7.18 (last 2.x release with security patches) and Java 1.8 → Java 17, along with the necessary Gradle infrastructure and compatibility changes.

Changes

File	Change
gradle.properties	springBootVersion 2.0.3.RELEASE → 2.7.18, springDependencyManagementPluginVersion 1.0.3.RELEASE → 1.1.4, micrometerVersion 1.0.4 → 1.9.17
build.gradle (root)	sourceCompatibility/targetCompatibility 1.8 → 17, java plugin → java-library
gradle/wrapper/gradle-wrapper.properties	Gradle 4.10.2 → 7.6.4 (Spring Boot 2.7.x requires Gradle ≥ 6.8)
buildSrc/build.gradle	compile → implementation
buildSrc/.../IntegrationTestsPlugin.groovy	Migrate deprecated Gradle APIs (testCompile→testImplementation, testClassesDir→testClassesDirs, reports.html.destination→outputLocation)
All 15 subproject build.gradle files	compile → api, testCompile → testImplementation, runtime → runtimeOnly
ftgo-application/.../application.properties	Add spring.mvc.pathmatch.matching-strategy=ant_path_matcher for Springfox 2.8.0 compatibility

Why these extra changes were needed

• Gradle 7.6.4: Spring Boot 2.7.x plugin requires Gradle ≥ 6.8; the project was on 4.10.2.
• java-library + api: Gradle 7 removed the compile configuration. Using api (from java-library plugin) preserves the original transitive dependency behavior.
• IntegrationTestsPlugin: Several APIs used by this plugin were removed or changed in Gradle 7.
• Springfox compatibility: Spring Boot 2.6+ changed the default MVC path matching strategy to PathPatternParser, which breaks Springfox 2.x. Added ant_path_matcher workaround.
• Micrometer version: Updated from 1.0.4 to 1.9.17 to match Spring Boot 2.7.18's managed micrometer-core version.

Build verification

./gradlew clean compileJava passes for all modules except ftgo-end-to-end-tests-common, which has a pre-existing dependency resolution failure (io.eventuate.util:eventuate-util-test is unavailable — the eventuate Maven repo was already commented out before this PR).

Review & Testing Checklist for Human

• Verify ./gradlew clean compileJava compiles successfully (excluding end-to-end test modules which have a pre-existing dependency issue)
• Confirm CI/CD pipeline runs with JDK 17
• Spot-check that the application starts up correctly with the new Spring Boot version
• Verify Swagger UI loads at /swagger-ui.html (Springfox with ant_path_matcher workaround)

Notes

• This is intentionally Spring Boot 2.7.18 (not 3.x) to minimize disruption as requested.
• The JAXB runtime dependencies in ftgo-common are retained since they're needed for Java 17 (JAXB was removed from the JDK in Java 11+).
• Deprecation warnings about Gradle 8.0 compatibility are expected with Gradle 7.6.4 and can be addressed in a future upgrade.
• A future PR could migrate from Springfox to SpringDoc OpenAPI (the maintained successor) to remove the ant_path_matcher workaround.

Link to Devin session: https://app.devin.ai/sessions/83edc95fe1da47d3992cb0cbe643793e
Requested by: @WesternConcrete

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