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Explain Error:The 'java' plugin has been applied, but it is not compatible with the Android plugins

I will keep it simple. I am using both kotlin and java in my Android project. I can provide my gradle files if necessary.
I need the following java plugins in my project: id 'java-library'
id "org.web3j". They work on an older version of Android gradle ('com.android.tools.build:gradle:3.6.3' ; distributionUrl=https\://services.gradle.org/distributions/gradle-5.6.4-all.zip) but not on the newest one ("com.android.tools.build:gradle:4.1.1" ; distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip) from which I need other functionality. When I try to add them I get the following error.
Error:The 'java' plugin has been applied, but it is not compatible with the Android plugins
Old gradle version has plugins:
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'com.google.gms.google-services'
apply plugin: 'kotlin-android-extensions'
New gradle version has plugins:
plugins {
id 'com.android.application'
id 'kotlin-android'
id 'com.google.gms.google-services'
// id "org.web3j" version "4.8.1"
// id 'java-library'
}
I found others with the same problem but with no real answer. One workaround I found here is to configure them for a subproject or something, but I don't really understand how. Can somebody help? Ideally tell me what and where to put it in which gradle file and how it works (from my understanding I have only 1 project not many in my Android app).
This is the code that I found:
configure(allprojects) {
println "applying java plugin to $project"
apply plugin: 'java-library'
//...
}

You cannot add org.web3j as a plugin because it contains 'java' plugins that are not compatible with 'java' plugins of android. So, you can either add 'com.android.application' plugin or 'org.web3j'. Add web3j as a dependency -
implementation ('org.web3j:core:4.8.7'). It will work fine.

DaggerApplicationComponent not generated in my code?

DaggerApplicationComponent is not generated in my code, I am learning Dagger for android and facing this issue. Below my project files.
https://github.com/SK010101/AdvanceAndroidTutorial
// component = DaggerApplicationComponent.builder()
// .applicationModule(new ApplicationModule(this))
// .build();
this thing not generated.
I have tried all clean and rebuild project.
Also tried Invalidate Caches/Restart.
Please help anyone))

inside dependencies block, add these lines:
api 'com.google.dagger:dagger:2.24'
api 'com.google.dagger:dagger-android:2.24'
api 'com.google.dagger:dagger-android-support:2.24'
annotationProcessor 'com.google.dagger:dagger-compiler:2.24'
kapt 'com.google.dagger:dagger-compiler:2.24'
annotationProcessor 'com.google.dagger:dagger-android-processor:2.24'
kapt 'com.google.dagger:dagger-android-processor:2.24'
compileOnly 'javax.annotation:jsr250-api:1.0'
implementation 'javax.inject:javax.inject:1'
Inside android block of build.gradle,
kapt {
generateStubs = true
}
At the top of the build.gradle, Do this in exactly below order.
apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'
apply plugin: 'kotlin-kapt'
apply plugin: 'kotlin-android-extensions'
Finally, You need to enable "Annotation processor" from File>Other Settings>Settings for New Projects>search"Annotation processor"
After this, do from Menu Build > Rebuild. Done!

My Bug solved after Build run on emulator))

Failed to apply plugin "com.google.gms.google-services"

Here is my project build.gradle:
buildscript {
...
dependencies {
...
classpath 'com.google.gms:google-services:3.1.0'
}
}
In one of the module's build.gradle I have this:
apply plugin: 'com.google.gms.google-services'
which results into the following error:
Could not get unknown property 'LibraryVariants' for object of type com.android.build.gradle.LibraryExtension.
Fun fact, if I set google-services version to 3.0.0, this specific error disappears, but Gradle asks me to downgrade versions of other google libraries, but I really do not want to do that.
How do I deal with these LibraryVariants?

You only set apply plugin: 'com.google.gms.google-services' in the app module, and in no other modules.

You must add one dependencies in your build.gradle(Project:project_name)
classpath 'com.google.gms:google-services:3.1.0'
And add in your build.gradle(build.gradle:Module app)
apply plugin: 'com.google.gms.google-services'
dependencies {
compile 'com.android.support:appcompat-v7:25.3.1'
compile 'com.android.support:design:25.3.1'
}
apply plugin: 'com.google.gms.google-services'

android push notifications library with google cloud messaging

i am working on an android using GCM application and adding support libraries,i added the following to my gradle
i added a plugin
apply plugin: 'com.android.application'
apply plugin: 'com.google.gms.google-services'
and dependencies: i added:
compile 'com.google.android.gms:play-services:8.3.0'
classpath 'com.google.gms:google-services:3.0.0'
but it brings an error
Error:(3, 0) Plugin with id 'com.google.gms.google-services' not found.
and yet i see the plugin added. how to i correct it thank you

In your project level build.gradle add like following:
buildscript {
repositories {
jcenter()
}
dependencies {
classpath 'com.android.tools.build:gradle:2.1.2'
classpath 'com.google.gms:google-services:3.0.0'
// NOTE: Do not place your application dependencies here; they belong
// in the individual module build.gradle files
}
}
While your App level build.gradle should look like this:
apply plugin: 'com.android.application'
dependencies {
compile fileTree(dir: 'libs', include: ['*.jar'])
compile "com.google.android.gms:play-services-gcm:8.3.0"
}
apply plugin: 'com.google.gms.google-services'
Make sure to add apply plugin: 'com.google.gms.google-services' as last line in your app level gradle file.

You should only apply the com.android.application plugin.
Applying the java plugin as well will result in a build error.
Reference : http://tools.android.com/tech-docs/new-build-system/user-guide
The dependencies you have added are fine. You can remove the "apply plugin: 'com.google.gms.google-services'" entry.

Apt for Java subproject

I am developing an Android project. I have a plain java subproject. I would like to activate the apt process for this java subproject. My gradle file:
project(':subproject') {
apply plugin: 'java'
apply plugin: 'android-apt'
dependencies {
compile files('../app/libs/sqliteannotations-api-0.1-SNAPSHOT.jar')
apt files('../app/libs_annotations/sqliteannotations-0.1-SNAPSHOT-jar-with-dependencies.jar')
}
}
but I get this error:
The android or android-library plugin must be applied to the project

Add apply plugin: 'com.android.application' if you are working on an app.
Add apply plugin: 'com.android.library' if you are working on a library.