Overview

What is MicroEJ?

MicroEJ (pronounced “micro-EDGE”) is a software vendor of cost-driven solutions for embedded and IoT devices.

The MicroEJ solution is made up of two products:

MICROEJ VEE (Virtual Execution Environment) is an application container for resource-constrained embedded devices running on microcontrollers or microprocessors. It allows devices to run multiple and mixed managed code (Java code, C code or JavaScript code).
MICROEJ SDK allows developers to develop applications in Managed Code and deploy them to resource-constrained devices, such as microcontrollers.

The following video demonstrates the typical development process using MICROEJ SDK 6 Simulator:

MICROEJ VEE

MICROEJ VEE provides a fully configurable set of services that can be expanded, including but not limited to:

a secure multi-application framework,
a GUI framework (includes widgets),
a network framework with security (SSL/TLS, HTTPS, REST, MQTT, …),
a storage framework (file system),
a Java Cryptography Architecture (JCA) implementation.

For more information about our Supported Processor Architectures, visit the Supported Hardware page.

MICROEJ SDK

MICROEJ SDK offers a comprehensive toolset to build the software for embedded devices.

The SDK covers two levels in device software development:

Device integration and porting (adapting MICROEJ VEE to run on the target device).
Application development.

Using the SDK, an application developer is able to:

Develop and test applications on the Simulator.
Deploy the application locally on the device.
Package and publish the application on a repository or an application store, enabling remote end users to install it on their devices.

The SDK produces two versions of the application build:

An Executable binary to be deployed on the device. It includes MICROEJ VEE, all device drivers and a specific set of functionalities useful for application developers targeting this device.
A Virtual Device which is used as a device simulator by application developers, acting as a bridge to other stakeholders, including marketing teams, translators, and project managers.

The following diagram outlines the SDK content. Please refer to the SDK 6 User Guide chapter for more details on the SDK and its usage.

Build Workflow

An Executable is built from several input resources and tools. Each component has dependencies and requirements that must be carefully respected in order to build an Executable.

Resources and Dependencies Flow

Let’s take a closer look at the resources MicroEJ has to offer and where to find them.

MicroEJ Resources and Origins to Build Applications — MicroEJ Resources to Build Applications and their Origins

VEE Port Build Flow

To build an application, a VEE Port is required, you can see below how a VEE port is built from a MICROEJ Architecture.

Executable Build Flow

Using a VEE Port here is how we build the executable for embedded devices.