Build Tools

Materials

• Gradle installation
• Multi-project with Gradle

Practice

In this task you are going to create the same application as in Maven module, but with Gradle build tool.

Task 1

1. After Gradle installation make sure that you have 'gradle' package with wrapper inside;
2. Open root settings.gradle file and add two modules: utils, demo.

Task 2

Custom jar utils-1.3.5.jar will be created with the following instructions:

• The jar should contain class StringUtils with method boolean isPositiveNumber(String str).
• Apache Commons Lang 3.10 library is used to implement this method.

1. Open build.gradle in 'utils' and fill it with proper group, version and delete comments with proper implementation

plugins {
    // id for library
    // id for maven to publish jar to local repository
}

java {
// provide sourceCompatibility
}

repositories {
// provide repository, where required dependencies are located
}

publishing {
    publications {
        maven(MavenPublication) {
// provide groupId
// provide artifactId
// provide version

            from components.java
        }
    }
}

//add Apache Apache Commons Lang 3.10 (or higher) dependency

jar {
    manifest {
        //provide manifest with such attributes as 'Implementation-Title', 'Implementation-Version'
    }
}

2. Implement method in StringUtils.class:

public class StringUtils {
    public static boolean isPositiveNumber(String str) {
        //here magic will happen
    }
}

Task 3

Now we will use the created util class:

1. Open build.gradle in 'demo' and fill in group, version, repositories and required dependency;

2. Provide required implementation:

public class Utils {
    public static boolean isAllPositiveNumbers(List<String> args) {
       //magic happens here
    }
}

Task 4

Make sure that application passes all test suits.