A DESCRIPTION OF THE PROBLEM :
Relates to JDK-4356783

# Problem
When `java -jar ...` is used together with a class path option (e.g. `-cp`) that option is silently ignored.
This behavior might not be obvious to users, and it will be difficult to understand why ClassNotFoundExceptions occur, especially if different setups with `-cp` worked correctly for the user.

(And also the documentation for `-cp` does not mention that it might be ignored; only the documentation for `-jar` mentions it.)

# Suggested solution
When `-jar` is used together with a class path option such as `-cp` a warning should be printed that the class path option is ignored.