java-hello-world.md

Oracle Functions Java Hello World

Create and deploy your first Java function on Oracle Functions.

Start by logging in to your development environment as an Oracle Functions developer

Pre-requiste: Create an application

Start by creating an application

Bootstrap a Java function

Create a Java function by entering:

fn init --runtime java helloworld-func-java

A directory called helloworld-func-java is created, containing:

A directory called helloworld-func is created, containing:

• a function definition file called func.yaml
• a /src directory containing source files and directories for the function
• a Maven configuration file called pom.xml that specifies the dependencies required to compile the function

Deploy your function

Change directory to the helloworld-func-java directory created in the previous step:

cd helloworld-func-java

Enter the following single command to build the function and its dependencies as a Docker image called helloworld-func-java, push the image to the specified Docker registry, and deploy the function to Oracle Functions:

fn -v deploy --app helloworld-app

Invoke your function

Invoke the helloworld-func-java function by entering:

fn invoke helloworld-app helloworld-func-java

The Hello, world! output is displayed.

You can also pass in a payload to invoke the function:

echo -n 'Bob' | fn invoke helloworld-app helloworld-func-java

The Hello, Bob! output is displayed.

Congratulations! You've just created, deployed, and invoked your first Java function using Oracle Functions!