Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By : Alex Gonzalez
Book Image

Embedded Linux Development Using Yocto Project Cookbook - Second Edition

By: Alex Gonzalez

Overview of this book

The Yocto Project has become the de facto distribution build framework for reliable and robust embedded systems with a reduced time to market.You'll get started by working on a build system where you set up Yocto, create a build directory, and learn how to debug it. Then, you'll explore everything about the BSP layer, from creating a custom layer to debugging device tree issues. In addition to this, you’ll learn how to add a new software layer, packages, data, scripts, and configuration files to your system. You will then cover topics based on application development, such as using the Software Development Kit and how to use the Yocto project in various development environments. Toward the end, you will learn how to debug, trace, and profile a running system. This second edition has been updated to include new content based on the latest Yocto release.
Table of Contents (13 chapters)
Title Page
Packt Upsell

Integrating Java applications

The meta-java layer also offers helper classes to ease the integration of Java libraries and applications into Yocto. In this recipe, we will see an example of building a Java library using the provided classes.

Getting ready

The meta-java layer provides two main classes to help with the integration of Java applications and libraries:

  • The Java bbclass: This provides the default target directories and some auxiliary functions, namely:
    • oe_jarinstall: This installs and symlinks a JAR file
    • oe_makeclasspath: This generates a classpath string from JAR filenames
    • oe_java_simple_wrapper: This wraps your Java application in a shell script
  • The Java-library bbclass: This inherits the Java bbclass and extends it to create and install JAR files

How to do it...

We will use the following meta-custom/recipes-java/java-helloworld/java-helloworld-1.0/ graphical Swing hello world example:

import javax.swing.JFrame; 
import javax.swing.JLabel; 
public class HelloWorldSwing...