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https://issues.apache.org/jira/browse/GEODE-9476?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17512603#comment-17512603
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Darrel Schneider edited comment on GEODE-9476 at 3/25/22, 10:08 PM:
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I think the issue with having com.sun.management.OperatingSystemMXBean in our
code is that it does not exist on Windows. I think we support building on
Windows not just running on it. Code with a reference to this class will fail
to compile on Windows. If it was just a Windows runtime issue we catch
ClassNotFoundException and be okay.
But I might be wrong about this. It just be an issue with the fd limits. It is
worth doing some builds on windows to see what will work.
was (Author: dschneider):
I think the issue with having com.sun.management.OperatingSystemMXBean in our
code is that it does not exist on Windows. I think we support building on
Windows not just running on it. Code with a reference to this class will fail
to compile on Windows. If it was just a Windows runtime issue we catch
ClassNotFoundException and be okay.
> VMStats processCpuTime, fdLimit, and fdsOpen will always be zero on java 16
> and later
> -------------------------------------------------------------------------------------
>
> Key: GEODE-9476
> URL: https://issues.apache.org/jira/browse/GEODE-9476
> Project: Geode
> Issue Type: Bug
> Components: statistics
> Reporter: Darrel Schneider
> Priority: Major
> Labels: Java16
>
> VMStats processCpuTime, fdLimit, and fdsOpen will always be zero on java 16
> and later.
> This is because it calls Method.setAccessible which is not allowed under
> normal conditions starting with java 16 (see:
> https://softwaregarden.dev/en/posts/new-java/illegal-access-in-java-16).
> A workaround for this bug is to start the jvm with --illegal-access=permit
> The setAccessible call is in the static initializer for:
> org.apache.geode.internal.stats50.VMStats50
> It turns out the following works for calling processCpuTime:
> {code:java}
> OperatingSystemMXBean osBean =
> ManagementFactory.getOperatingSystemMXBean();
> com.sun.management.OperatingSystemMXBean sunBean =
> (com.sun.management.OperatingSystemMXBean) osBean;
> System.out.println("getProcessCpuTime=" +
> sunBean.getProcessCpuTime());
> {code}
> so we can get rid of the setAccessible call
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