Hi, I am using Kotlin Multiplatform to build iOS/A...

# ios

[Jan]

Hi, I am using Kotlin Multiplatform to build iOS/Android App. Recently I just updated to Gradle 8.0.0 due update of AndroidStudio from Electric Eel to Flamingo. Starting the iOS Project from AndroidStudio is working fine. Right now I do have a problem to run my iOS Project from Xcode (14.3). Building the ios framework fails with: "Android Gradle plugin requires Java 17 to run. You are currently using Java 11. ...
Your current JDK is located in /Library/Java/JavaVirtualMachines/amazon-corretto-11.jdk/Contents/Home". I do not understand why XCode has a different JDK. In my .zshr file its defined like: export JAVA_HOME=/Applications/Android\ Studio.app/Contents/jbr/Contents/Home and if I check ./gradlew -v it says: Gradle 8.0
------------------------------------------------------------

Build time: 2023-02-13 131521 UTC
Revision: 62ab9b7c7f884426cf79fbedcf07658b2dbe9e97

Kotlin: 1.8.10
Groovy: 3.0.13
Ant: Apache Ant(TM) version 1.10.11 compiled on July 10 2021
JVM: 17.0.6 (JetBrains s.r.o. 17.0.6+0-17.0.6b802.4-9586694)
OS: Mac OS X 13.0.1 aarch64

Why is gradle using a differnt JDK while running from xCode?

[Jan]

If I add the following to gradle.properties.kts

#org.gradle.java.home=/Applications/Android\ <http://Studio.app/Contents/jbr/Contents/Home|Studio.app/Contents/jbr/Contents/Home>

its working from xCode. Unfortunately this is a hardcoded path and it will not be the same for every other developer.

[Landry Norris]

You need to set your system jvm to the right version. It's best to not do it in gradle.properties. It works in AS, since AS uses its own jvm.

[Jan]

And how do I set my system jvm to the right version? I thought exporting my JAVA_HOME via .zshrc like this "JAVA_HOME=/Applications/Android\ Studio.app/Contents/jbr/Contents/Home" would help but didn't. What helped was to download&install java via https://www.java.com/en/download/

[Jan]

prio the fresh install of java I deinstalled the amazon-coretto-11 sdk via https://docs.aws.amazon.com/corretto/latest/corretto-8-ug/macos-install.html

[Landry Norris]

Is this macos? If so, there's /usr/bin/java_home or something like that.

[Jan]

yes, macos

[Jan]

after deinstallation of amazon-coretto no java runtime was found at all during build of app via xcode

[Landry Norris]

Use the java_home executable. It was either in /usr/bin or /usr/lib. It can detect and choose java versions.

[Landry Norris]

Google will know the flags. I don't remember them off the top of my head.

[Jan]

I do not understand completely. On MacOs I open a terminal/shell. When I enter "which java" it displays "/usr/bin/java". "java -v" then displays:

openjdk version "17.0.6" 2023-01-17
OpenJDK Runtime Environment (build 17.0.6+0-17.0.6b802.4-9586694)
OpenJDK 64-Bit Server VM (build 17.0.6+0-17.0.6b802.4-9586694, mixed mode)

After deinstall of amazon-coretto-jdk 11. The shell command "/usr/libexec/java_home -V" did not display anything. After I installed Java again from java.com the shell command now displays:

Matching Java Virtual Machines (1):
    1.8.371.11 (x86_64) "Oracle Corporation" - "Java" /Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home
/Library/Internet Plug-Ins/JavaAppletPlugin.plugin/Contents/Home

After I installed it, XCode was able to build my iosApp again.

So I don't understand whats the difference between these two?

[Landry Norris]

/usr/bin/java is just a symlink. It points to the actual selected jvm. Install another jvm (I use homebrew for this), then select it with java_home

[Jan]

but why does "/usr/libexec/java_home -V" only lists one jdk? I would expect that also the "openjdk version 17.0.6" should be listed

[Landry Norris]

It may not be installed in the right place. It only checks a specific JavaVirtualMachines folder.

[Jan]

ok, thanks for your help!

[Jan]

ok, I finally found a solution. It seems that I have to add my JAVA_HOME path to xCode, see https://twitter.com/creativedrewy/status/1648768542400192512?s=20