title: Gradle can not resolve appengine
body: <p>I want to deploy my spring app on google app engine but i got this error message :</p>
  
  <pre><code>Execution failed for task ':appengineDeploy'.
  &gt; Deployment projectId must be defined or configured to read from system state
    1. Set appengine.deploy.projectId = 'my-project-id'
    2. Set appengine.deploy.projectId = 'GCLOUD_CONFIG' to use project from gcloud config.
    3. Using appengine.deploy.projectId = 'APPENGINE_CONFIG' has been deprecated.
  </code></pre>
  
  <p>google cloud sdk and app engine tools are already installed on my laptop.</p>
  
  <p>i searched on the internet and i found that i must put the project ID in gradle file :</p>
  
  <pre><code>appengine {
    deploy {
      projectId = "my-project-id"
    }
  }
  </code></pre>
  
  <p>but the problem is that gradle can not resoble all of these properties.</p>
  
  <p>is there a problem with my gradle file that may caused this problem?</p>
  
  <pre><code>import org.jetbrains.kotlin.gradle.tasks.KotlinCompile
  
  buildscript {
      dependencies {
          classpath("com.google.cloud.tools:appengine-gradle-plugin:2.1.0")
      }
  }
  
  plugins {
      id("org.springframework.boot") version "2.2.0.M4"
      id("io.spring.dependency-management") version "1.0.7.RELEASE"
      kotlin("jvm") version "1.3.31"
      kotlin("plugin.spring") version "1.3.31"
  }
  
  apply(plugin = "com.google.cloud.tools.appengine")
  
  group = "com.demo.app"
  version = "1.0"
  java.sourceCompatibility = JavaVersion.VERSION_1_8
  
  repositories {
      mavenCentral()
      maven { url = uri("https://repo.spring.io/snapshot") }
      maven { url = uri("https://repo.spring.io/milestone") }
  }
  
  extra["springCloudVersion"] = "Hoxton.M1"
  
  dependencies {
      implementation("org.jetbrains.kotlin:kotlin-reflect")
      implementation("org.jetbrains.kotlin:kotlin-stdlib-jdk8")
  
      implementation("org.springframework.cloud:spring-cloud-starter-netflix-eureka-server")
      implementation("org.springframework.boot:spring-boot-starter-web")
  
      testImplementation("org.springframework.boot:spring-boot-starter-test") {
          exclude(group = "org.junit.vintage", module = "junit-vintage-engine")
          exclude(group = "junit", module = "junit")
      }
  }
  
  dependencyManagement {
      imports {
          mavenBom("org.springframework.cloud:spring-cloud- 
     dependencies:${property("springCloudVersion")}")
      }
  }
  
  tasks.withType&lt;Test&gt; {
      useJUnitPlatform()
  }
  
  tasks.withType&lt;KotlinCompile&gt; {
      kotlinOptions {
          freeCompilerArgs = listOf("-Xjsr305=strict")
          jvmTarget = "1.8"
      }
  }
  </code></pre>