/sys$common/syshlp/helplib.hlb JAVA, Qualifiers, /JIT  *Conan The Librarian (sorry for the slow response - running on an old VAX)

       /JIT
       /NOJIT
       -jit
       -nojit

    The Just-in-Time compiler (JIT) runs by default when you enter
    the Java command. To run the Java command with the interpreter
    instead of the JIT, use:

    $ JAVA /NOJIT ...

    The Java debugger runs the interpreter by default. To run the
    Java debugger with the JIT compiler, the /JIT qualifier must be
    explicitly specified.

    The JIT runs by default when you run appletviewer. To run
    appletviewer with the interpreter, use:

    $ APPLETVIEWER /PARAMETERS="-nojit"