If we want to execute a Java executable from a Gradle build, we have several options. Before we explore these options, we will first create a new Java class with a main() method in our project. We will execute this Java class from our build file.

In the src/main/java/gradle/sample directory, we need to create a new SampleApp.java file. The following code listing shows the contents of the file. We will use our Sample class to print the value of the getWelcomeMessage() method to System.out:

// File: src/main/java/gradle/sample/SampleApp.java 
package gradle.sample; 
 
public class SampleApp { 
 
    public SampleApp() { 
    } 
 
    public static void main(String[] args) { 
        final SampleApp app = new SampleApp(); 
        app.welcomeMessage(); 
    } 
 
    public void welcomeMessage() { 
        final String welcomeMessage = readMessage(); 
        showMessage(welcomeMessage); 
    } 
 
    private String readMessage() { 
        final Sample sample = new Sample...