Webrev: http://cr.openjdk.java.net/~mchung/jdk9/webrevs/8168205/webrev.00/index.html
If -cp is not specified and -m is not specified, the builtin system class loader will default the class path to the current working directory. If -m is specified, no -cp and CLASSPATH environment variable is not set, it should mean no class path. This patch fixes the case if -m is specified and the value of java.class.path is empty, e.g. via -Djava.class.path option, then no class path should be set. This patch also updates the launcher code used for generating launcher for JDK tools. As the JDK tool no longer passes any class path, it removes APP_CLASSPATH macro. Mandy
