Problem: I want to use ksp with room. On adding ksp(libs.androidx.room.compiler) in the module level build.gradle.kts file, I get the following error:
Unable to load class 'org.jetbrains.kotlin.gradle.plugin.mpp.pm20.KotlinCompilationData'
org.jetbrains.kotlin.gradle.plugin.mpp.pm20.KotlinCompilationData
Gradle's dependency cache may be corrupt (this sometimes occurs after a network connection timeout.)
Re-download dependencies and sync project (requires network)
The state of a Gradle build process (daemon) may be corrupt. Stopping all Gradle daemons may solve this problem.
Stop Gradle build processes (requires restart)
Your project may be using a third-party plugin which is not compatible with the other plugins in the project or the version of Gradle requested by the project.
In the case of corrupt Gradle processes, you can also try closing the IDE and then killing all Java processes.
I tried both the mentioned options, Re-download dependencies as well as Stop Gradle build processes. both do not work, and I get the same error.
Below are my files and detailed procedure that I have followed to add ksp.
I created a new project from android studio and used the Kotlin DSL (Recommended) as the build configuration language.
I want to use room database in my project. So, I have added the following in my module level build.gradle.kts file. [Except for the dependencies, and the ksp plugin on the top, the full file is generated by android studio. none of the lines have been modified.]
@Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
plugins {
alias(libs.plugins.androidApplication)
alias(libs.plugins.kotlinAndroid)
id("com.google.gms.google-services")
// added for ksp
alias(libs.plugins.kspRoom)
}
android {
namespace = "com.example.myappname"
compileSdk = 34
defaultConfig {
applicationId = "com.example.myappname"
minSdk = 21
targetSdk = 34
versionCode = 1
versionName = "1.0"
testInstrumentationRunner = "androidx.test.runner.AndroidJUnitRunner"
}
buildTypes {
release {
isMinifyEnabled = false
proguardFiles(
getDefaultProguardFile("proguard-android-optimize.txt"),
"proguard-rules.pro"
)
}
}
compileOptions {
sourceCompatibility = JavaVersion.VERSION_1_8
targetCompatibility = JavaVersion.VERSION_1_8
}
kotlinOptions {
jvmTarget = "1.8"
}
buildFeatures {
viewBinding = true
}
}
dependencies {
implementation(libs.core.ktx)
implementation(libs.appcompat)
implementation(libs.material)
implementation(libs.constraintlayout)
implementation(libs.navigation.fragment.ktx)
implementation(libs.navigation.ui.ktx)
implementation(libs.firebase.auth)
implementation(libs.firebase.ui.auth)
testImplementation(libs.junit)
androidTestImplementation(libs.androidx.test.ext.junit)
androidTestImplementation(libs.espresso.core)
implementation(libs.play.services.auth)
implementation(libs.mqtt.client)
// added for room
implementation(libs.androidx.room.runtime)
annotationProcessor(libs.androidx.room.compiler)
implementation(libs.androidx.room.ktx)
implementation(libs.androidx.room.paging)
// below are the lines that throe error when uncommented.
//ksp(libs.androidx.room.compiler)
}
Here is the libs.version.toml file.
[versions]
agp = "8.2.0"
firebase-ui-auth = "8.0.2"
google-services = "4.4.0"
kotlin = "1.8.21"
core-ktx = "1.12.0"
junit = "4.13.2"
androidx-test-ext-junit = "1.1.5"
espresso-core = "3.5.1"
appcompat = "1.6.1"
material = "1.11.0"
constraintlayout = "2.1.4"
mqtt-client = "1.1.4"
navigation-fragment-ktx = "2.7.6"
navigation-ui-ktx = "2.7.6"
play-services-auth = "20.7.0"
room-runtime = "2.6.1"
firebase-auth = "22.3.0"
ksp = "1.8.10-1.0.9"
[libraries]
androidx-room-compiler = { module = "androidx.room:room-compiler", version.ref = "room-runtime" }
androidx-room-ktx = { module = "androidx.room:room-ktx", version.ref = "room-runtime" }
androidx-room-paging = { module = "androidx.room:room-paging", version.ref = "room-runtime" }
androidx-room-runtime = { module = "androidx.room:room-runtime", version.ref = "room-runtime" }
core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "core-ktx" }
firebase-ui-auth = { module = "com.firebaseui:firebase-ui-auth", version.ref = "firebase-ui-auth" }
google-services = { module = "com.google.gms:google-services", version.ref = "google-services" }
junit = { group = "junit", name = "junit", version.ref = "junit" }
androidx-test-ext-junit = { group = "androidx.test.ext", name = "junit", version.ref = "androidx-test-ext-junit" }
espresso-core = { group = "androidx.test.espresso", name = "espresso-core", version.ref = "espresso-core" }
appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
material = { group = "com.google.android.material", name = "material", version.ref = "material" }
constraintlayout = { group = "androidx.constraintlayout", name = "constraintlayout", version.ref = "constraintlayout" }
mqtt-client = { module = "com.ditchoom:mqtt-client", version.ref = "mqtt-client" }
navigation-fragment-ktx = { group = "androidx.navigation", name = "navigation-fragment-ktx", version.ref = "navigation-fragment-ktx" }
navigation-ui-ktx = { group = "androidx.navigation", name = "navigation-ui-ktx", version.ref = "navigation-ui-ktx" }
play-services-auth = { module = "com.google.android.gms:play-services-auth", version.ref = "play-services-auth" }
firebase-auth = { group = "com.google.firebase", name = "firebase-auth", version.ref = "firebase-auth" }
[plugins]
androidApplication = { id = "com.android.application", version.ref = "agp" }
kotlinAndroid = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
kspRoom = {id = "com.google.devtools.ksp", version.ref = "ksp"}
[bundles]
I have added the ksp plugin in the project level/top-level build.gradle.kts as follows:
buildscript {
dependencies {
classpath(libs.google.services)
}
}
// Top-level build file where you can add configuration options common to all sub-projects/modules.
@Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
plugins {
alias(libs.plugins.androidApplication) apply false
alias(libs.plugins.kotlinAndroid) apply false
// for ksp
// alias method by adding the id in toml file
alias(libs.plugins.kspRoom) apply false
// direct method of adding the id here itself
id("com.google.devtools.ksp") version "1.8.10-1.0.9" apply false
}
true
Using alias or direct id will not affect the build. Build will succeed if either of them are used.
The build succeeds for the above files if the ksp(libs.androidx.room.compiler) is not used in the module level. If the line is used, build fails with error above. [I haven't added any room db code or models to test of ksp has been successfully incorporated]
Also, here is my Gradle version from the Gradle wrapper: gradle-8.2-bin.zip
There is no documentation whatsoever, wherever by whoever on the internet.
Finally, found the solution. Works like a charm. The errors were due to incorrect versions.
Change JDK version to 18 (Amazon Corretto 18) from Settings -> Build Tools -> Gradle -> Gradle JDK
Change JavaVersion and Kotlin jvmTarget, both to 18 in module build.gradle.kts
Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
plugins {
alias(libs.plugins.androidApplication)
alias(libs.plugins.kotlinAndroid)
id("com.google.gms.google-services")
alias(libs.plugins.kspRoom)
}
// other sections of the build file
compileOptions {
sourceCompatibility = JavaVersion.VERSION_18
targetCompatibility = JavaVersion.VERSION_18
}
kotlinOptions {
jvmTarget = "18"
}
dependencies {
// other dependencies
implementation(libs.androidx.room.runtime)
annotationProcessor(libs.androidx.room.compiler)
ksp(libs.androidx.room.compiler)
implementation(libs.androidx.room.paging)
implementation(libs.androidx.room.ktx)
implementation(libs.androidx.paging.runtime.ktx)
implementation(libs.androidx.lifecycle.livedata.ktx)
}
Upgrade Kotlin version to 1.9.21, ksp version to 1.9.10-1.0.13. The libs.versions.toml file:
[versions]
// other versions
kotlin = "1.9.10"
ksp = "1.9.10-1.0.13"
[plugins]
//other plugins
kspRoom = {id = "com.google.devtools.ksp", version.ref = "ksp"}
The project level buil.gradle.kts will look like this:
buildscript {
dependencies {
classpath(libs.google.services)
}
}
// Top-level build file where you can add configuration options common to all sub-projects/modules.
@Suppress("DSL_SCOPE_VIOLATION") // TODO: Remove once KTIJ-19369 is fixed
plugins {
alias(libs.plugins.androidApplication) apply false
alias(libs.plugins.kotlinAndroid) apply false
alias(libs.plugins.kspRoom) apply false
}
true // Needed to make the Suppress annotation work for the plugins block