On Tue, Mar 7, 2017 at 10:06 AM, Alan Bateman <alan.bate...@oracle.com> wrote: > On 07/03/2017 08:32, Volker Simonis wrote: > >> Hi, >> >> java.lang.management.RuntimeMXBean offers methods like getClassPath(), >> getLibraryPath() and even getBootClassPath() if >> isBootClassPathSupported() returns true. While >> isBootClassPathSupported() has been changed in jdk9 to always return >> false (although the VM still supports -Xbootclasspath/a) no additional >> methods have been added to RuntimeMXBean to query the new module path. >> >> Is this intentional? I think RuntimeMXBean should contain at least a >> new method getModulePath() wich returns the VMs module path. Looking >> at the latest spec [1] I couldn't find such an addition. Will this be >> added in the final version or are there some reasons against having >> getModulePath() in RuntimeMXBean? >> >> Exposing further information trough RuntimeMXBean like the one >> provided by the --upgrade-module-path, --add-modules, --limit-modules, >> --list-modules could be interesting/useful as well. >> > Fair point although many of the existing methods are just convenience > methods (they are equivalent to invoking System.getProperty). RuntimeMXBean > also defines getSystemProperties to get all the system properties and so a > management tool does have a way to get the module path, upgrade module path, > and main module/main class if needed. RuntimeMXBean also defines > getInputArguments so there is a way (where supported) to see VM options such > as --limit-options. >
OK, but shouldn't the RuntimeMXBean also provide an ability to list all the observable modules (like --list-modules)? Before jdk9 something similar could be achieved by scanning sun.boot.class.path, but that possibility is gone now. > That said, I could see one of the platform MXBeans (maybe RuntimeMXBean) > exposing access to the modules in the runtime. It's an area that was looked > at briefly in the early exploratory phase of Project Jigsaw but not in > recent time. Yes, that's probably what I meant :) > > -Alan.
