Remove launch-time JRE version selection [JEP-231]

Prior to Java 9, we could use the mJRE (Multiple JRE) feature to specify a specific JRE version, or range of versions, for launching our applications. We would accomplish this via the command-line option -version or with an entry in the JAR file's manifest. The following flowchart illustrates what happens based on our selection:

This functionality was introduced with JDK 5 and was not fully documented in that release or any subsequent release prior to JDK 9.

The following specific changes were introduced with the Java 9 platform:

• The mJRE feature has been removed.
• The launcher will now produce an error whenever the -version command-line option is used. This is a terminal errors in that processing will not continue.
• A warning will be produced if there is a -version entry in a JARs manifest. The warning will not stop execution.

Interestingly, the presence of a -version entry in a manifest file will only generate a warning. This is by design, to...