Working with Java multi-project builds

In a Java project, we usually have compile or runtime dependencies between projects. The output of one project is a compile dependency for another project, for example. This is very common in Java projects. Let's create a Java project with a common project that contains a Java class used by other projects. We will add a services project that references the class in the common project. Finally, we will add a web project with a Java servlet class that uses classes from the services project.

We have the following directory structure for our project:

root/
build.gradle
settings.gradle
common/
    src/main/java/sample/gradle/util/
        Logger.java
services/sample
    src/main/java/sample/gradle/
        api/
            SampleService.java
        impl/
            SampleImpl.java
    src/test/java/sample/gradle/impl/
        SampleTest.java
web/
    src/main/java/sample/gradle/web/
         SampleServlet.java
    src/main/webapp/WEB-INF/
        web.xml...