Jar deployment

Overview

Clever Cloud offers you to run any Java ARchive file. You do not need to change your code, but running it on Clever Cloud needs some configuration files or environment variable to specify the the JAR path.

Note : like other runtimes, Java application needs to listen on 0.0.0.0:8080

Create an application on Clever Cloud

via the web console

1. Create a new app by clicking on the Add an Application button, in the sidebar.
2. Select a brand new instance (or a repository from GitHub if your account is linked).
3. Then select Java + JAR in the platform list.
4. Configure your scaling options.
5. Enter your application’s name and description and click “Next”. You can also select the region you want (North America or Europe).

Refer to https://www.clever-cloud.com/doc/getting-started/ for more details on application creation via the console.

via the Clever Tools CLI

1. Make sure you have clever-tools installed locally. Report to https://www.clever-cloud.com/doc/reference/clever-tools/getting_started/
2. In your code folder, do clever create --type <type> <app-name> --region <zone> --org <org> where type is the type of technology you rely on, app-name the name you want for your application, zone deployment zone (par for Paris and mtl for Montreal), and org the organization ID the application will be created under.

Refer to https://www.clever-cloud.com/doc/reference/clever-tools/create/ for more details on application creation with Clever Tools.

Setting up environment variables on Clever Cloud

With the Clever Cloud console

1. Go to the Clever Cloud console, and find the app you want to fine tune under it’s organization.
2. Find the Environment variables menu and select it.
3. In this menu, you will see a form with VARIABLE_NAME and variable value fields. Fill them with the desired values then select Create.

With the Clever Tools CLI

1. Make sure you have clever-tools installed locally. Report to https://www.clever-cloud.com/doc/reference/clever-tools/getting_started/
2. In your code folder, do clever env set <variable-name> <variable-value>

Refer to https://www.clever-cloud.com/doc/reference/reference-environment-variables/ for more details on available environment variables on Clever Cloud. You can of course create custom ones with the interface we just demonstrated, they will be available for your application.

Available Java versions

Simply set the environment variable CC_JAVA_VERSION to the version you want

Accepted values are 7 to 15 or graalvm-ce (for GraalVM 21.0.0.2, based on OpenJDK 11.0).

Configure your Java application

You must either have the CC_JAR_PATH environment variable containing the path to your jar or provide a clevercloud/jar.json file (jar.json file in clevercloud folder which is at the root of you application) that contains at least the following:

{
  "deploy": {
    "jarName": "path/to/jar"
  }
}

That is the least you need to do. Note that path/to/jar must not start with a / and that the path should be relative to your repository’s root.

Build options

You do not need to build and commit a JAR. Instead you can push your sources and build them with either gradle, ant or maven. Here is the configuration you need to provide in the clevercloud/jar.json file:

{
  "build": {
    "type": "maven"|"gradle"|"ant",
    "goal": "package"
  }
}

The goal field is what will be asked to the build command, like mvn package for a maven build with the package goal.

An configuration example with a maven build that generates a JAR with embedded dependencies is:

{
  "build": {
    "type": "maven",
    "goal": "package"
  },
  "deploy": {
    "jarName": "target/myproject-1.0-jar-with-dependencies.jar"
  }
}

An example of full configuration

You can pass extra arguments to the java command by using the environment variable CC_EXTRA_JAVA_ARGS and to your JAR by using CC_JAR_ARGS

The full configuration can look like the following:

{
  "build": {
    "type": "<string>",
    "goal": "<string>"
  },
  "deploy": {
    "goal": "<string>",
    "jarName": "<string>"
  }
}

You can use the following properties:

Monitor your application with New Relic

You can use New Relic to monitor your application on Clever Cloud. Please refer to [the New Relic section of the documentation] to configure it for your application.

Custom run command

If you need to run a custom command (or just pass options to the program), you can specify it through the CC_RUN_COMMAND environment variable. This will override the default way of running your application.

Example:

CC_RUN_COMMAND=java -jar somefile.jar <options>

Environment injection

Clever Cloud can inject environment variables that are defined in the dashboard and by add-ons linked to your application.

For Java applications, the environment is injected in the System.getProperties() object. So, to use a variable, you just do System.getProperties().getProperty("MY_VARIABLE").

For Groovy applications, just use the System.getProperty("MY_VARIABLE").

Git Deployment on Clever Cloud

You need git on your computer to deploy via this tool. Here is the official website of Git to get more information: git-scm.com

Setting up your remotes

1. The “Information” page of your app gives you your git deployment URL. It looks like this: git+ssh://git@push.clever-cloud.com/<your_app_id>.git. Copy it in your clipboard.

2. Locally, under your code folder, type in git init to set up a new git repository or skip this step if you already have one.

3. Add the deploy URL with git remote add <name> <your-git-deployment-url>.

4. Add your files via git add <files path> and commit them via git commit -m <your commit message>.

5. Now push your application on Clever Cloud with git push <name> master

Refer to https://www.clever-cloud.com/doc/getting-started/quickstart/ for more details on git deployments.

Linking a database or any other add-on to your application

By linking an application to an add-on, the application has the add-on environment variables in its own environment by default.

On add-on creation

Many add-ons do exist on Clever Cloud, please refer to the full list and check add-ons dedicated pages for full instructions.

During add-on creation, you will see Applications screen, with a list of your applications. You can toggle the button to Link and click next. If you finish the process of add-on creation, the application will automatically be linked to it.

Add-on already exists

In the Clever Cloud console, under the Service Dependencies menu of your application, you can use the Link addons dropdown menu to select the name of the add-on you want to link and use the add button to finish the process.

You can also link another application from the same page in the Clever Cloud console, using the Link applications dropdown menu.

More configuration

Need more configuration? To run a script at the end of your deployment? To add your private SSH key to access private dependencies? Go check the Common configuration page.

You may want to have an advanced usage of your application, in which case we recommend you to read the Administrate documentation section.

If you can’t find something or have a specific need like using a non supported version of a particular software, please reach out to the support.