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/HelloWorldSwing.java graphical Swing hello world example:

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