Migrate to Java 17 and Spring Boot 3.2.5

[devin-ai-integration]

Summary

Migrates springboot-java8 from Java 8 / Spring Boot 2.0.2 to Java 17 / Spring Boot 3.2.5 across both the Maven and Gradle build files.

pom.xml

• spring-boot-starter-parent 2.0.2.RELEASE → 3.2.5
• <java.version> 1.8 → 17
• <packaging> pom → jar (the original was set to pom, which prevents Maven from compiling Java sources — flagged as a known bug in the repo's environment notes; needed to actually verify the migration compiles)
• Drop spring-boot-properties-migrator — it was historically used to flag deprecated 1.x property names in 2.x; nothing in application.properties or this codebase relies on it, so it's not useful for 2.x → 3.x and Spring Boot stops shipping it after 3.x for that path
• Pin maven-compiler-plugin 3.11.0 with <source>17</source>/<target>17</target>
• Add spring-boot-starter-test (provides JUnit 5) so the test lifecycle is wired up even though the project currently has no tests under src/test/

build.gradle

• spring-boot-gradle-plugin 2.0.2.RELEASE → 3.2.5
• sourceCompatibility / targetCompatibility 1.8 → 17
• compile(...) → implementation(...), testCompile(...) → testImplementation(...)
• Replace junit:junit with spring-boot-starter-test (JUnit 5; matches Spring Boot 3 conventions)
• Add spring-boot-starter-jdbc and h2 — these were declared in pom.xml but were missing from build.gradle, so gradlew build could not compile Application.java even on the original codebase
• bootJar { baseName = ...; version = ... } → archiveBaseName / archiveVersion — the legacy properties were removed in modern Gradle / the Boot 3 plugin

Build wrappers (Boot 3.2 enforces minimum versions)

• Maven wrapper: 3.3.9 → 3.9.6 (Boot 3.2 requires Maven 3.6.3+)
• Gradle wrapper: 4.6 → 8.5 (Boot 3.2 requires Gradle 7.5+)

gs-spring-boot.iml

• LANGUAGE_LEVEL JDK_1_8 → JDK_17. The library entries that reference javax.annotation:javax.annotation-api:1.3.2 and javax.validation:validation-api:2.0.1.Final are auto-generated by IntelliJ and will be regenerated to their jakarta.* equivalents on the next "Reimport All Maven Projects" action; updating them by hand would just be churn that IntelliJ rewrites.

javax.* → jakarta.* source migration

• No source changes were needed: a full grep over src/ finds zero javax.* imports in the application code. The only javax.* references in the repo are in IntelliJ metadata (.idea/uiDesigner.xml references javax.swing.*, which is part of the JDK and not affected by Jakarta EE 9; gs-spring-boot.iml library entries are regenerated by IntelliJ).

Other dependency updates

• JUnit 4 dropped in favor of JUnit 5 via spring-boot-starter-test, in line with the migration guidance.
• All other transitive dependencies (Tomcat, Jackson, Hibernate Validator, etc.) come from the Spring Boot 3.2.5 BOM and are inherited automatically.

Verification

Locally on JDK 17:

• ./mvnw clean package — BUILD SUCCESS. Produces a runnable target/gs-spring-boot-0.1.0.jar that starts on Spring Boot 3.2.5 + Tomcat 10 + H2 (verified by running the jar — Tomcat starts on :8080, the JdbcTemplate seed/query for customers runs cleanly).
• ./gradlew build — BUILD SUCCESSFUL.

Note: the existing Application CommandLineRunner calls http://gturnquist-quoters.cfapps.io/api/random, which is a long-decommissioned demo endpoint and has been broken on master independent of this migration. It surfaces as a runtime DNS error after the Spring context starts; it is not caused by the upgrade and is out of scope here.

Review & Testing Checklist for Human

• Confirm dropping spring-boot-properties-migrator is acceptable for your usage; if you want to keep it temporarily, it should be removed once the upgrade is validated.
• Confirm flipping <packaging> from pom to jar is acceptable (it's required for the project to compile / produce an executable jar).
• Verify any downstream IntelliJ users do an "Reimport All Maven Projects" after pulling so gs-spring-boot.iml regenerates the jakarta.* library entries.
• Decide whether the dead gturnquist-quoters.cfapps.io quote-of-the-day call in Application.java should be removed/replaced as a follow-up; it's pre-existing but more visible now that the rest of the stack is healthy.
• Run ./mvnw spring-boot:run (or java -jar target/gs-spring-boot-0.1.0.jar) on JDK 17 and exercise an endpoint, e.g. curl http://localhost:8080/greeting?name=world, curl http://localhost:8080/topics.

Notes

• Pre-existing tracked target/classes/*.class files were left untouched to keep the diff scoped to the migration; they will be overwritten on the next build. A follow-up to add target/ and build/ to .gitignore would be a small, separate clean-up.

Link to Devin session: https://app.devin.ai/sessions/5c0474b7621b477d8683100447bfadf0
Requested by: @vanessasalas-cog

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