Trying to get `ktor` to build locally on `macOS` `...

# ktor

[Matt Nelson]

Trying to get ktor to build locally on macOS Arm64 machine in order to work on a PR, but keep getting errors when running jvmTest as described in CONTRIBUTING.md . ./gradlew assemble runs successfully.

Any suggestions?

admin@Mac_Mini ktor % java --version
openjdk 21.0.5 2024-10-15
OpenJDK Runtime Environment Homebrew (build 21.0.5)
OpenJDK 64-Bit Server VM Homebrew (build 21.0.5, mixed mode, sharing)

admin@Mac_Mini ktor % echo $JAVA_HOME  
/opt/homebrew/Cellar/openjdk@21/21.0.5/libexec/openjdk.jdk/Contents/Home

stacktrace.txt

[hfhbd]

Unsupported class version is caused by a class that is compiled with an higher jdk loaded with a lower JVM. So try to use a lower JVM, like 8/11. While Ktor does use the Java toolchain, it does not work everywhere in Ktor project.

[Osip Fatkullin]

Yes, currently tests pass only if JAVA_HOME specifies path to JVM 1.8
This problem is going to be solved after #4500 merged.

[Osip Fatkullin]

Should be fixed. Though, now the project requires JDK 21 installed.