Android Room in Kotlin 1.7.0-CodePudding

When updating to Kotlin 1.7.0, since it's required by the latest version of Jetpack Compose, I found out that Room was no longer working. I was using kapt as my annotation processor, and the compiler was throwing error messages such as:

[*] error: Query method parameters should either be a type that can be converted into a database column or a List / Array that contains such type. You can consider adding a Type Adapter for this.

CodePudding user response：

The fix was to migrate from kapt to ksp. KSP is the theoretical successor of kapt, and it's developed by Google. To do so, first I had to import the library into my classpath:

buildscript {
  ...
  repositories {
    ...
    classpath "com.google.devtools.ksp:com.google.devtools.ksp.gradle.plugin:1.7.0-1.0.6"
    ...
  }
}

Check the latest version from MVN Repository just in case there has been an update, but as the time of writing this the latest version for Kotlin 1.7.0 is 1.7.0-1.0.6.

Now, in my module's build.gradle:

plugins {
  ...

  // Remove the old kapt plugin
  id 'org.jetbrains.kotlin.kapt'

  // Add the new KSP plugin
  id 'com.google.devtools.ksp'

  ...
}

...

android {
  ...
  defaultConfig {
    ...
    // Replace old compile options
    javaCompileOptions {
      annotationProcessorOptions {
        arguments  = [ "room.schemaLocation": "$projectDir/schemas".toString() ]
      }
    }
    // With the new KSP arg method
    ksp {
      arg("room.schemaLocation", "$projectDir/schemas".toString())
    }
    ...
  }
  ...
}

...

dependencies {
  ...
  // Replace all kapt calls with ksp
  // kapt "androidx.room:room-compiler:$room_version"
  ksp "androidx.room:room-compiler:$room_version"
}

Now Room should be working correctly in Kotlin 1.7.0!

CodePudding user response：

You can update the room version to 2.5.0-alpha02, which supports Kotlin 1.7.0, but it's still in alpha. Check the latest release hereenter link description here