Bug#895619: plexus-compiler: use --release instead of -source/-target for jdk9+ when setting defaults

[Thorsten Glaser]

On Mon, 2 Jul 2018, Emmanuel Bourg wrote:

> Base64 is easy, but sun.misc.Unsafe is another story. It's widely used

OIC. I haven’t run into that one yet.

How do I reproduce this with Java 8, anyway?

tglase at tglase:~ $ javac --release 1.8
javac: invalid flag: --release
Usage: javac <options> <source files>
use -help for a list of possible options

Despite http://openjdk.java.net/jeps/247 indicating
it should be supported.

(If for nothing else, then to see whether there are
any Sun-internal class uses left by breaking the build.)

Thanks,
//mirabilos
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