could not resolve plugin artifact 'com.google.protobuf:com.google.protobuf.gradle.plugin:0.8.11 code example

Example 1: protobuf gradle compile

protobuf {
  // Configure the protoc executable
  protoc {
    // Download from repositories
    artifact = 'com.google.protobuf:protoc:3.0.0'
  }
}

Example 2: protobuf java gradle

plugins {
  id "com.google.protobuf" version "0.8.14"
  id "java"
}