Simple Application

Note

Before trying this example, make sure you have the MMM CLI (Command Line Interface) installed.

This example shows the minimal code for a MicroEJ JavaScript application:

• create an Add-On Library project or a Sandboxed Application project

• add the MicroEJ JavaScript dependency in the build file of your project:

Gradle (build.gradle.kts)MMM (module.ivy)

implementation("com.microej.library.runtime:js:0.13.0")

• init the JavaScript code in your Java application with:

import com.microej.js.JsCode;

...

JsCode.init();

The class com.microej.js.JsCode is the Java class generated from the JavaScript sources.

• ask the MicroEJ JavaScript engine to start processing the job queue with:

import com.microej.js.JsRuntime;

...

JsRuntime.ENGINE.run();

This makes the JavaScript engine process the job queue forever until the program is stopped.

• create a file with the js extension in the src/main/js folder (for example app.js) with the following content:

print("My Simple Application");

• build and execute the application with the MMM CLI:

$ mmm build
$ mmm run

The message My Simple Application should be displayed.