[rokatyy]

Summary

Companion to the nuclio Java runtime migration to Java 25 LTS (nuclio/nuclio#4367). This branch carries four commits — the pre-existing in-flight bump-java work, the original Java 17 bytecode migration, a follow-up bumping that target to Java 25 once nuclio dropped armhf support, and a rewrite of Maven Central publishing. The SDK's public API (EventHandler, Context, Event, etc.) has zero deprecated/removed API usage and no runtime dependencies, so all four are build-tooling-only changes, not source changes:

Commit 1 — Update for newest version (pre-existing, bump-java):

• Bumps version 1.1.0 → 1.2.0.
• Bumps JUnit Jupiter 5.0.1 → 5.8.2.
• Replaces deprecated Gradle syntax: classifier → archiveClassifier, testCompile/testRuntime → testImplementation/testRuntimeOnly, baseName → archivesBaseName.
• Makes GPG signing conditional on signing properties being present (superseded by commit 4).

Commit 2 — Migrate build tooling to Java 17 bytecode target and Gradle 9:

• Originally pinned to Java 17 as the lowest common denominator across nuclio's Java runtime images (armhf was capped at JDK 17 at the time).
• Adds a real Gradle 9.7.1 wrapper, drops the ancient junit-platform-gradle-plugin for Gradle's native test { useJUnitPlatform() }, moves archivesBaseName into the Gradle-9-compatible base {} block, replaces dead Travis CI with GitHub Actions.

Commit 3 — Bump SDK bytecode target to Java 25, drop the JDK 17 floor:

• nuclio's companion PR drops armhf Java support entirely rather than pinning to JDK 17 indefinitely, so this SDK no longer needs a lowest-common-denominator target.
• Targets Java 25 via a Gradle toolchain (java { toolchain { languageVersion = JavaLanguageVersion.of(25) } }) rather than a plain sourceCompatibility/targetCompatibility pin — this auto-provisions a JDK 25 compiler via the Foojay resolver (new settings.gradle), so contributors don't need JDK 25 pre-installed locally.
• CI matrix drops JDK 17 — compiling for --release 25 requires the build's own JVM to already be JDK 25+.
• Version stays at 1.2.0 — never actually published to Maven Central, so there's nothing to skip past.

Commit 4 — Publish via Maven Central Portal and sign all publication artifacts:

• The old OSSRH endpoint (oss.sonatype.org) shut down on 2025-06-30, so publishing could not succeed as written.
• Replaces the hand-written publish/signing setup with com.vanniktech.maven.publish 0.37.0: uploads through the Central Portal, generates sources/javadoc jars, and signs every artifact (jar, sources, javadoc, POM) via the publication — previously only pom.asc was uploaded.
• Signing is required only for Maven Central tasks, so publishToMavenLocal works without a key (it previously failed with Could not get unknown property 'signArchives').
• Removes the archives configuration, pom.withXml signing and model {} rules — no Gradle deprecation warnings remain under --warning-mode all.

Test plan

• Real ./gradlew build under the actual Gradle 9.7.1 wrapper, with the toolchain auto-downloading a JDK 25 — succeeds.
• Verified via that JDK 25 toolchain's own javap that the compiled class files are major version 69 (Java 25 bytecode), confirming the target took effect.
• ./gradlew build publishToMavenLocal --warning-mode all succeeds without signing configured; published POM contains all Central-required fields.
• Verify signatures with a real key (.asc next to jar, sources, javadoc, POM).
• Publish 1.2.0 to Maven Central — needed before nuclio's Dockerfile SDK pin can be bumped off 1.1.0 (not blocking: old bytecode still loads fine on the new JVMs). Requires:
  • io.nuclio namespace verified on central.sonatype.com and a Portal user token in mavenCentralUsername / mavenCentralPassword (replaces sonatypeUsername / sonatypePassword).
  • A signing key via signing.keyId / signing.password / signing.secretKeyRingFile, or signingInMemoryKey / signingInMemoryKeyPassword.
  • ./gradlew publishAndReleaseToMavenCentral.

🤖 Generated with Claude Code

[Copilot]

Copilot review overview

🟡 Changes recommended

Unconditional POM signing and the unversioned launcher dependency can break publishing and dependency resolution.

Get a fresh assessment by requesting another Copilot review.

Review effort: Lite
Findings: 1 · 1

Open (2)

• Documentation links to unpublished 1.2.0 artifact · New
• Incorrectly requires contributors to install JDK 25 · New

What changed in this PR

Migrates the Java SDK build to Gradle 9.7.1 and Java 25 bytecode, with updated CI, publishing, testing, and documentation.

Changes:

• Adds Foojay-managed Java 25 toolchain support.
• Modernizes Gradle, JUnit, signing, and publishing configuration.
• Replaces Travis CI with GitHub Actions and updates README guidance.

File	Summary
settings.gradle	Configures Foojay toolchain resolution.
README.md	Updates dependency and Java documentation; the 1.2.0 link is unpublished, and local JDK requirements are misstated.
gradlew.bat	Adds the Windows Gradle wrapper script.
gradlew	Adds the POSIX Gradle wrapper script.
gradle/​wrapper/​gradle-wrapper.properties	Pins Gradle 9.7.1.
build.gradle	Updates Java, testing, publishing, and signing configuration. POM signing remains unconditional, and the launcher dependency lacks a version.
.travis.yml	Removes obsolete Travis CI configuration.
.github/​workflows/​test.yaml	Adds Java 25 GitHub Actions CI.

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[TomerShor]

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