VMS Help JAVA, Qualifiers, /CHECKSOURCE  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /CHECKSOURCE
       -cs
       -checksource

    When a compiled class is loaded, this option causes the
    modification time of the class bytecode file to be compared to
    that of the class source file. If the source was modified more
    recently, it is recompiled and the new class file is loaded.