cmd: stack trace with `jdiskmark run` w ubuntu installer

[jamesmarkchan]

running in command line with jdiskmark triggered a stack trace, maybe an issue with jpackage and direct io.

java.util.concurrent.ExecutionException: java.lang.Exception: Threaded IO operation failed
	at java.base/java.util.concurrent.FutureTask.report(Unknown Source)
	at java.base/java.util.concurrent.FutureTask.get(Unknown Source)
	at jdiskmark.App.waitBenchmarkDone(App.java:629)
	at jdiskmark.RunBenchmarkCommand.call(RunBenchmarkCommand.java:205)
	at jdiskmark.RunBenchmarkCommand.call(RunBenchmarkCommand.java:18)
	at picocli.CommandLine.executeUserObject(CommandLine.java:2031)
	at picocli.CommandLine.access$1500(CommandLine.java:148)
	at picocli.CommandLine$RunLast.executeUserObjectOfLastSubcommandWithSameParent(CommandLine.java:2469)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2461)
	at picocli.CommandLine$RunLast.handle(CommandLine.java:2423)
	at picocli.CommandLine$AbstractParseResultHandler.execute(CommandLine.java:2277)
	at picocli.CommandLine$RunLast.execute(CommandLine.java:2425)
	at picocli.CommandLine.execute(CommandLine.java:2174)
	at jdiskmark.App.main(App.java:156)
Caused by: java.lang.Exception: Threaded IO operation failed
	at jdiskmark.BenchmarkRunner.runOperation(BenchmarkRunner.java:189)
	at jdiskmark.BenchmarkRunner.execute(BenchmarkRunner.java:118)
	at jdiskmark.BenchmarkCallable.call(BenchmarkCallable.java:91)
	at jdiskmark.BenchmarkCallable.call(BenchmarkCallable.java:15)
	at java.base/java.util.concurrent.FutureTask.run(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.base/java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.base/java.lang.Thread.run(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: com/sun/nio/file/ExtendedOpenOption
	at jdiskmark.Sample.measureWrite(Sample.java:210)
	at jdiskmark.BenchmarkRunner.lambda$runOperation$2(BenchmarkRunner.java:149)
	at jdiskmark.BenchmarkRunner.lambda$runOperation$4(BenchmarkRunner.java:160)
	at java.base/java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
	... 4 more
Caused by: java.lang.ClassNotFoundException: com.sun.nio.file.ExtendedOpenOption
	at java.base/jdk.internal.loader.BuiltinClassLoader.loadClass(Unknown Source)
	at java.base/java.lang.ClassLoader.loadClass(Unknown Source)

note running with the jar in the normal zip distro should work fine