Deploy my Gradle (Spring Boot) app in Heroku - heroku

Question

I have a gradle + spring boot application with the following build.gradle file:
buildscript {
ext {
springBootVersion = '2.0.0.BUILD-SNAPSHOT'
}
repositories {
mavenCentral()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
}
dependencies {
classpath("org.springframework.boot:spring-boot-gradle-plugin:${springBootVersion}")
}
}
apply plugin: 'java'
apply plugin: 'eclipse'
apply plugin: 'org.springframework.boot'
jar {
baseName = 'teambuilting'
version = '0.0.1-SNAPSHOT'
}
sourceCompatibility = 1.8
targetCompatibility = 1.8
repositories {
mavenCentral()
maven { url "https://repo.spring.io/snapshot" }
maven { url "https://repo.spring.io/milestone" }
}
dependencies {
compile('org.springframework.boot:spring-boot-starter-actuator')
compile('org.springframework.boot:spring-boot-actuator-docs')
compile('org.springframework.boot:spring-boot-starter-data-rest')
compile('org.springframework.data:spring-data-rest-hal-browser')
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.boot:spring-boot-starter-web-services')
compile('org.springframework.boot:spring-boot-starter-data-mongodb')
testCompile('org.springframework.boot:spring-boot-starter-test')
}
But, when I am trying to deploy my master branch in Heroku, I get the following error:
-----> Failed to detect set buildpack https://codon-buildpacks.s3.amazonaws.com/buildpacks/heroku/gradle.tgz
More info: https://devcenter.heroku.com/articles/buildpacks#detection-failure
! Push failed
I added in the Buildpacks, heroku/gradle. What else am I missing?

Answer 1

you have to define in the dashboard that the project use the buildpack for Gradle. In the build.gradle, has to add this task:
task stage {
dependsOn build
}
and create a Procfile to indicate the next steps once heroku build your software.
Juan Antonio