Project updates

[stephenkirk-toast]

Upgrade to Java 21 and Gradle 8.10

Summary

Upgrades the project build toolchain from Java 17 to Java 21 and Gradle from 8.1.1 to 8.10. Also adds support for protokt extensions-lite library to resolve runtime classloading issues with
Google Protocol Buffer type converters.

Changes

Build System Upgrades

• Java Version: Upgraded from Java 17 to Java 21
  • Updated JVM target to JVM_21 in Kotlin compiler options
  • Updated Java toolchain to use Java 21
• Gradle Version: Upgraded from 8.1.1 to 8.10
  • Updated Gradle wrapper and wrapper scripts
  • Updated gradle-wrapper.properties with new distribution URL

Dependency Management

• Added: proto-google-common-protos-extensions-lite as a compileOnly dependency
  • Provides Google Protobuf type converters (e.g., LocalDateGoogleConverter)
  • Follows the same runtime classloading pattern as other protokt common proto libraries
  • Prevents NoClassDefFoundError for converter classes at runtime

Code Changes

• SeperatedJars.kt:
  • Added PROTOKT_COMMON_EXTENSIONS_LITE constant for the new extensions-lite jar
  • Updated protoKTJars list to include the new jar for runtime loading
  • Minor cleanup: Changed unused exception parameter to _ (suppresses warning)
• Test Fixes:
  • Replaced deprecated URL(String) constructors with URI(String).toURL() in test files
  • Updated RunTimeJarLoaderTest to include the new extensions-lite jar in expected test data
  • Added proper imports for java.net.URI

Cleanup

• Removed unused variables tempBuildDir and pulsarClientJar from build.gradle.kts

Testing

All tests pass successfully with the new configuration:

• ✅ Unit tests updated and passing
• ✅ Build compiles with -Werror (warnings as errors) enabled
• ✅ Gradle wrapper verification successful

Breaking Changes

None - this is a backward-compatible upgrade that maintains existing functionality while adding support for additional protokt features.