gradle.allprojects{

    task CommonTasks{
        println "CommonTasks - loaded"
    }

    CommonTasks.doFirst{
        println "CommonTasks - doFirst : here i want to use variable, that is declared in project build"
    }

    CommonTasks.doLast{
        println "CommonTasks - doLast"
    }

}

apply plugin : 'java'

//some-where here i want to pass a variable in CommonTasks
clean.dependsOn CommonTasks