The following options were not recognized by any processor: '[kapt.kotlin.generated, room.incremental]'

Question

:app:kaptDebugKotlin
w: warning: The following options were not recognized by any processor: '[kapt.kotlin.generated, room.incremental]'

Why am I getting this? I am using Room in a multi module project.

Kotlin version: 1.3.50
AGP: 3.5.0
Room: 2.2.0-rc01

Shared libraries module: api "androidx.room:room-runtime:$room_version" api "androidx.room:room-ktx:$room_version" api "androidx.room:room-rxjava2:$room_version"

App module:

kapt "androidx.room:room-compiler:$room_version"

Gradle.properties

kapt.incremental.apt=true

Build.gradle defaultConfig includes these compile options:

javaCompileOptions {
        annotationProcessorOptions {
            arguments = ["room.incremental":"true"]
        }
    }

Thanks Kaushik I think you've pointed me in the right direction. I edited the answer to reflect that those dependencies are specified in one module, and an app module features the annotation processor. Possibly I am specifying the flags in modules which do not use the processor — Daniel Wilson, Oct 03 '19 at 10:10
i think the solution is to configure the build.gradle of the module that contains the RoomDatabase derived class. — Kaushik Burkule, Oct 03 '19 at 10:16
Yes this is the key, so even if a module has the dependencies and annotation processor but doesn't use them, it seems to produce this warning. If you leave this as an answer I will accept, maybe it will help someone :) — Daniel Wilson, Oct 03 '19 at 10:43

score 7 · Accepted Answer · answered Oct 03 '19 at 10:57

This type of problem can occure with a multi-module project that has been added to room. For such a project the problem was caused by adding the RoomDatabase derived class to a library module, but configuring the build.gradle of app module.

The solution is to configure the build.gradle of the module that contains the RoomDatabase derived class.

In the build.gradle file in the dependencies{} section add the dependency for the room compiler.

kapt "android.arch.persistence.room:compiler:$room_version"

Note that for java based project use below code

annotationProcessor "android.arch.persistence.room:compiler:$room_version"

score 3 · Answer 2 · answered Nov 15 '19 at 04:05

While I agree that missing kapt in module was the original problem in IDE.

"androidx.room:room-compiler:${roomVersion}"

There can be other one in CLI, which you can see with verbose warnings:

Current JDK version 1.8.0_191-8u191-b12-2ubuntu0.18.04.1-b12 has a bug (https://bugs.openjdk.java.net/browse/JDK-8007720) that prevents Room from being incremental. Consider using JDK 11+ or the embedded JDK shipped with Android Studio 3.5+.warning: The following options were not recognized by any processor: '[kapt.kotlin.generated, room.incremental]'[WARN] Incremental annotation processing requested, but support is disabled because the following processors are not incremental: androidx.room.RoomProcessor (DYNAMIC).

Did you happen to fix the jdk version bug issue? – theThapa Jan 15 '20 at 13:53 — theThapa, Jan 15 '20 at 13:53

score 0 · Answer 3 · edited Mar 26 '20 at 12:06

I had this issue before: what did I do?

First, in build.gradle file in the object called defaultConfig I have to delete:

javaCompileOptions {
    annotationProcessorOptions {
        arguments = ["room.incremental":"true"]
    }
}

I have to replace:

implementation 'androidx.lifecycle:lifecycle-extensions:2.0.0'
def room_version = "2.2.5"
implementation "androidx.room:room-runtime:$room_version"
kapt "androidx.room:room-compiler:$room_version"

With:

// Room components
def room_version = "2.2.5"
implementation "android.arch.persistence.room:runtime:$room_version"
kapt "android.arch.persistence.room:compiler:$room_version"
kaptAndroidTest "android.arch.persistence.room:testing:$room_version"

// Lifecycle components
def archLifecycleVersion = "2.2.5"
implementation "android.arch.lifecycle:extensions:$archLifecycleVersion"
kapt "android.arch.lifecycle:compiler:$archLifecycleVersion"

Second, in gradle.properties I add:

kapt.incremental.apt=true
kapt.use.worker.api=true
android.lifecycleProcessor.incremental=true

See related problem in other stack overflow page about this configuration.

The following options were not recognized by any processor: '[kapt.kotlin.generated, room.incremental]'

3 Answers3