RFR: 8282691: add jdb support for passing --enable-preview and --add-modules to the debuggee JVM

[Chris Plummer]

On Sun, 6 Mar 2022 08:38:41 GMT, Alan Bateman <alanb at openjdk.org> wrote:

> `jshell --enable-preview` allows developers to use preview features in the REPL, having `jdb --enable-preview` and passing it through to the launching debugee would be useful too.

Is that the same as `-R--enable-preview` or `-J--enable-preview`? The help output isn't clear. It list the following options, which at first glance look like they would apply to the target process, but than that's also what `-R` is for:

    --class-path <path>   Specify where to find user class files
    --module-path <path>  Specify where to find application modules
    --add-modules <module>(,<module>)*
                          Specify modules to resolve, or all modules on the
                            module path if <module> is ALL-MODULE-PATHs
    --enable-native-access
                          Allow code to run restricted native methods
    --enable-preview      Allow code to depend on preview features of this release

-------------

PR: https://git.openjdk.java.net/jdk/pull/7708