Upgrade to sbt 2.0.10 and Scala 3.9.0

[xerial]

Summary

• sbt 1.12.15 → 2.0.10 and Scala 3.7.1 → 3.9.0. Scala is only used for the build definition, since there are no Scala sources.
• sbt-osgi 0.10.0 → 0.11.0-RC1, its first release for sbt 2. The other plugins (sbt-pgp, sbt-scalafmt, sbt-dynver) already had sbt 2 builds at their current versions.
• build.sbt fixes for sbt 2 and Scala 3: url(...) → uri(...), and the infix exclude → .exclude(...).
• CI on JDK 8 and 11: sbt 2 itself requires JDK 17+, so each test jdkN job installs JDK 21 for sbt. Tests run in a forked JVM on the matrix JDK via the new TEST_JAVA_HOME variable, which is applied to Test / forkOptions. Setting Test / javaHome instead would also make javac run on JDK 8, which fails on --release. The JAR integration test also uses TEST_JAVA_HOME.
• testFull in CI: sbt 2's test skips tests that passed in a cached previous run, and switching TEST_JAVA_HOME doesn't invalidate that cache. CI caches ~/.cache, so it now runs testFull.
• SnappyLoaderTest: it hard-coded target/classes, which sbt 2 no longer uses. It now gets the class path from Snappy's code source.
• Output paths: sbt 2 builds into target/out/jvm/u/snappy-java/ instead of target/, so the musl job and test-jar-integration.sh now find the classes directory and jar with find.

Verification

• Compared the sbt 2 build with the current sbt 1 build of main:
  • Jar contents are identical.
  • The POM is identical, apart from the version.
  • The OSGi manifest (Export/Import-Package, Bundle-NativeCode, activator, etc.) is identical, apart from version and timestamp fields.
• ./sbt testFull on JDK 25: 139 passed, 1 ignored
• TEST_JAVA_HOME=<zulu 8> ./sbt testFull with sbt on JDK 25: 139 passed, 1 ignored
• script/test-jar-integration.sh with TEST_JAVA_HOME=<zulu 8>: passed
• publishSigned and sonaRelease are still available, and publishTo resolves as before
• CI matrix (JDK 8/11/17/21/25, musl)
• Snapshot publish after merge

Notes

• sbt-osgi for sbt 2 is still a release candidate. The generated manifest matches the current one.
• sbt 2 needs JDK 17+ locally. The release and snapshot workflows already use JDK 21.

💎 Generated with Treasure Work