Gradle reports BUILD SUCCESSFUL, however I cannot find the .class files

I am trying to use Gradle (for the first time) to build multiple java projects.

I created a settings.gradle file with all the project names. I am also creating a very simple build.gradle file. To my surprise, when I run Gradle build. It returns BUILD SUCCESSFUL. The boxes are created in the build \ libs folder. What puzzles me is that there are no .class files. Also I was unable to get any Junit results or xml output.

I am wondering if this is working correctly. This is my simplest build.gradle file so far. Any input is appreciated, thanks.

subprojects {
    apply plugin: 'java'
    apply plugin: 'eclipse-wtp'

    version = '1.0'

    compileJava.destinationDir = file("$buildDir/output/classes")

    repositories {

    }

    dependencies {
    }

    test {      
        testLogging {
            exceptionFormat 'full'
            events 'started', 'passed', 'skipped', 'failed', 'standardOut', 'standardError'
        }
    }

    jar {
        manifest.attributes provider: 'gradle'
    }
}

      

        
        
        
      

    

As requested, this is my project directory structure.

MainProject
build.gradle
settings.gradle
--SubProject1
---- CSI
--Subproject2
---- CSI
.
...
...