Room Persistence lib implementation in Kotlin

Question

I am implementing Room persistence lib in kotlin for my database implementation.

Following are my Entity, Dao and Database cla

Answer 1

Here my gradle files, i didn't need to add thoses plugins.

build.gradle(project):

buildscript {
    ext.kotlin_version = '1.1.2-4'
    ext.lifecycle_version = '1.0.0-alpha1'
    ext.room_version = '1.0.0-alpha1'

    repositories {
        jcenter()
    }
    dependencies {
        classpath 'com.android.tools.build:gradle:2.3.2'
        classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"

    }
}

build.gradle (app)

apply plugin: 'com.android.application'
apply plugin: 'kotlin-android'

//enable anotation processing with kotlin, disabled by default
kapt {
    generateStubs = true
}


android {
/**
...
**/
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    //kotlin
    compile "org.jetbrains.kotlin:kotlin-stdlib-jre7:$kotlin_version"

    //support
    compile 'com.android.support:appcompat-v7:25.3.1'

    //google architecture
    compile "android.arch.lifecycle:runtime:$lifecycle_version"
    compile "android.arch.lifecycle:extensions:$lifecycle_version"
    annotationProcessor "android.arch.lifecycle:compiler:$lifecycle_version"
    kapt "android.arch.lifecycle:compiler:$lifecycle_version"

    //database
    compile "android.arch.persistence.room:runtime:$room_version"
    annotationProcessor "android.arch.persistence.room:compiler:$room_version"
    kapt "android.arch.persistence.room:compiler:$room_version"

}
repositories {
    mavenCentral()
}

Then run menu build-> make project to create impl class. Hope this helps