apply plugin: 'java'

task show {
    doLast {
        // Access the convention property as a project property
        println relativePath(sourceSets.main.java.outputDir)
        println relativePath(project.sourceSets.main.java.outputDir)

        // Access the convention property via the convention object
        println relativePath(project.convention.plugins.java.sourceSets.main.java.outputDir)
    }
}