RFR (M): 8061616: HotspotDiagnosticMXBean.getVMOption() throws IllegalArgumentException for flags of type double

[Hohensee, Paul]

Please review a proposed backport from jdk9 to jdk8u that fixes a serviceability issue.

Bug: https://bugs.openjdk.java.net/browse/JDK-8061616
Original jdk patch: http://hg.openjdk.java.net/jdk9/jdk9/jdk/rev/ef6ec39fd6bd
Original hotspot patch: http://hg.openjdk.java.net/jdk9/jdk9/hotspot/rev/1bac07f399ac

jdk webrev: http://cr.openjdk.java.net/~phh/8061616/webrev.8u.jdk.01/
hotspot webrev: http://cr.openjdk.java.net/~phh/8061616/webrev.8u.hotspot.01/

Other than a few context and copyright date differences, the only change is testing InitialRAMPercentage rather than CompileThresholdScaling. The latter doesn’t exist in jdk8.

Passed:


jdk/ test/com/sun/management/HotSpotDiagnosticMXBean
hotspot/test/testlibrary_tests/whitebox/vm_flags/DoubleTest.java

Thanks,
Paul