Kotlin repo build fails with `> Task :libraries...

# compiler

[mcpiroman]

Kotlin repo build fails with
> Task :libraries:tools:mutability-annotations-compat:compileJava FAILED
error: Source option 6 is no longer supported. Use 7 or later.
error: Target option 6 is no longer supported. Use 7 or later.
on most recent master branch (de22a467a12714505a6f66f0a01bd7d7fc0ca9e2). Is it a know problem or something on my side?

[scaventz]

I'm not sure about this, maybe kotlin doesn't support jdk6 anymore, maybe you need jdk7 and later to compile it.

[mcpiroman]

I have jdk 6,7,8 and 15. But it looks like it comes from the build script of the module, it has:
project.updateJvmTarget("1.6")
I changed that to 1.8 and so far the compilation proceeds (it has not finished yet).

[mcpiroman]

Yup, it compiled with the mentioned change.

[udalov]

Be sure to check out the slightly updated instruction here: https://github.com/JetBrains/kotlin#build-environment-requirements

[mcpiroman]

@udalov Yes, I followed that, that's how I managed to build everything. Only the one mentioned line of config was the problem. Is the team sure it is correct?

[udalov]

^ @tapchicoma

[tapchicoma]

@mcpiroman with what exactly config line do you have problem?

[mcpiroman]

@tapchicoma libraries\tools\mutability-annotations-compat\build.gradle.kts
I changed
project.updateJvmTarget("1.6") to project.updateJvmTarget("1.8")
for the build to pass.

[tapchicoma]

you should not change this, but rather add kotlin.build.isObsoleteJdkOverrideEnabled=true to the local.properties file

[mcpiroman]

Interesting, as explained in https://github.com/JetBrains/kotlin#build-environment-requirements I only need this if I do not have Java 1.6 and 1.7, which I do (configured by JDK_16 and JDK_17). I want to be able to build the whole project.
Btw. while te assemble task passes, when I run `compilerTest`I get an error about unsupported java version 52.0, sth. like that.
So maybe I have not configured something correctly?

[tapchicoma]

Does running ./gradlew javaToolchains task list your JDK 1.6 and 1.7?

[mcpiroman]

Yup

+ Oracle JDK 1.7.0_80
     | Location:           C:\Program Files\Java\jdk1.7.0_80
     | Language Version:   7
     | Vendor:             Oracle
     | Is JDK:             true
     | Detected by:        Windows Registry

 + Sun Microsystems Inc. JDK 1.6.0_45
     | Location:           C:\Program Files\Java\jdk1.6.0_45
     | Language Version:   6
     | Vendor:             Sun Microsystems Inc.
     | Is JDK:             true
     | Detected by:        Windows Registry

[tapchicoma]

with which JDK version are you running Gradle daemon?

[mcpiroman]

With openjdk 15.1. But now when I ran compilerTest the mentioned error does not occur. Instead there expected failing tests regarding my changes in the compiler. (FYI I have rebased the repo last week.)
So it may be that the issue is gone, or that gradle just reordered some tasks or something and I will hit the same thing later, I can't say until I fix the tests.

[tapchicoma]

Commit, you've mentioned in initial message, should actually fix the issue of running Gradle daemon on >JDK 1.8. JDK 15 does not support anymore target 6

[mcpiroman]

Oh, so what JDK should I run the gradle with? Or does it mean that I can use 15 since that commit?

[tapchicoma]

you could use any JDK to run Gradle since that commit

[tapchicoma]

before java-only modules use Gradle JDK version instead of project default JDK 1.8

[mcpiroman]

Ok, thanks. I will post here if it happens that the corrected kotlin project does not want to build anyway.

[mcpiroman]

I've run the previous in terminal.
But now that I execute compilerTest from Intellij, I get:

> Task :kotlin-scripting-jvm:test
FATAL ERROR in native method: processing of -javaagent failed
java.lang.UnsupportedClassVersionError: kotlinx/coroutines/debug/AgentPremain : Unsupported major.minor version 52.0

[mcpiroman]

The gradle uses jdk 15.1 as well. Project SDK is also set to 15.1.

[mcpiroman]

I mean 15.0.1

[tapchicoma]

I will check this 🤔

Though according to java.lang.UnsupportedClassVersionError: kotlinx/coroutines/debug/AgentPremain : Unsupported major.minor version 52.0 message - error in kotlinx.coroutines artifact that located in the separate repository that was not yet migrated to the Gradle toolchain feature. Better to use JDK 11 to compile it.