How can I solve the "The 'java' plugin has been applied, but it is not compatible with the Android plugins." problem if my KMM module has to target both platforms: jvm and android

plugins {
  kotlin("multiplatform")
  // java - dont do this
}

Is enough to target both jvm and android

if I have java code in my jvmMain and provide

kotlin {
    jvm {
        withJava()
    }
}

the java plugin is always applied automatically by kotlin.multiplatform plugin

@Gamadril I don't think you can have both a

jvmMain

and an

androidMain

in the same project yet, you have to pick one.

what's the sense of a Kotlin multiplatform module then? my jvmMain code is based on Springboot, androidMain is using android-only libraries. They are not compatible at all..

You van have

jvmMain

and

androidMain

plugins {
  id("com.android.library")
  kotlin("multiplatform")
}

kotlin {
  android {}
  jvm {
    // withJava() - not allowed if android {} is present
  }
}

hope that helps

YOu can definitely have both JVM and Android targets, and optionally make Android extend JVM. Here’s the build script for a logging library I maintain that has separate JVM/Android sourcesets if you want a working example https://github.com/copper-leaf/clog/blob/master/clog-core/build.gradle.kts

@Casey Brooks: thanks, my build.gradle file looks similar to yours. However if you add withJava() inside jvm {} you will get the same error

That error is correct, he Android plugin is not compatible with the normal Java gradle plugin. It’s always been this way, even outside of Kotlin, and is not going to change. But you only need the java plugin applied if you’re using actual Java source files. If you’re writing the library in pure Kotlin source, it will still work just fine without using

withJava()

, you’ll still have access to all the Java stblib classes and any Java dependencies in your

jvmMain

sourceset