where is NotNull in java? [duplicate]

I want to compile simple code with oracle jdk 1.8:

class Foo { public static void test(@NotNull String a) {} } 

But idea not understand such code, and suggest to add:

import com.sun.istack.internal.NotNull; 

after that compilation inside idea works, but if run build by gradle with such build.gradle:

version '1.0-snaphshot_03.03.2017' apply plugin: 'java' targetCompatibility = '1.8' sourceCompatibility = '1.8' repositories { mavenCentral() } task sourcesJar(type: Jar, dependsOn: classes) { classifier = 'sources' from sourceSets.main.allSource } dependencies { testCompile group: 'junit', name: 'junit', version: '4.11' } artifacts { archives sourcesJar } 

I got error:

error: package com.sun.istack.internal does not exist import com.sun.istack.internal.NotNull; error: cannot find symbol public static void test(@NotNull String a) { ^ symbol: class NotNull location: class Foo 

I thought that NotNull was added in 1.8? How can I make possible of usage of NotNull in idea and gradle?