heroku-gradle-buildpack-example

migrate from maven to gradle (heroku only)

install heroku cli, register (if has no account) and login

brew install heroku
heroku login

clone my heroku maven (java buildpack) example project which has already ptrepared gradle stuff

git clone https://github.com/daggerok/heroku-java-buildpack-example.git
rm -rf .git .mvn mvnw* pom.xml heroku.yml

add requred heroku-gradle setup

echo "task stage(dependsOn: 'build')" >> build.gradle

create heroku app and deploy to it with development profile

git init .
heroku create daggerok-gradle-buildpack

echo "web: SPRING_PROFILES_ACTIVE=dev ./build/libs/*.jar" > Procfile
git add .
git commit -am "First blood!"
git push heroku master

heroku logs -t
# find output: The following profiles are active: dev,spring-boot,data-jpa

key points here (if you just create app from scratch):

• you need prepare gradle stage task for build

  echo "task stage(dependsOn: 'build')" >> build.gradle

• you need prepare Procfile with bash application startup command (in out case it’s: ./build/libs/*.jar)

  echo "web: SPRING_PROFILES_ACTIVE=dev ./build/libs/*.jar" > Procfile

• you need install gradle wrapper in your project

  gradle wrapper
  git add -f gradle*
  git commit -am "Add gradle wrapper"

going production

for production (heroku) version add postgres database

heroku addons:create heroku-postgresql:hobby-dev

now let’s configure correct heroku URL and switch spring-boot app to production prpofile which is using postgres database:

echo "web: SPRING_PROFILES_ACTIVE=prod APP_BASE_URL=https://daggerok-gradle-buildpack.herokuapp.com ./build/libs/*.jar" > Procfile
git add .
git commit -am "Setup right heroku application environment variables"
git push heroku master

just FYI

heroku git:remote -a daggerok-gradle-buildpack
git remote -v
# skip others...
heroku  https://git.heroku.com/daggerok-gradle-buildpack.git (fetch)
heroku  https://git.heroku.com/daggerok-gradle-buildpack.git (push)

link:

• Getting Started with Gradle on Heroku

• Heroku Gradle documentation

• heroku buildpack gradle

• Gradle heroku buildpack example project

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