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https://issues.apache.org/jira/browse/IGNITE-13306?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17166301#comment-17166301
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Ivan Bessonov commented on IGNITE-13306:
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Hi [~maliev],
I have two possible fixes for you to consider:
* you may not invoke "setAccessible" in
org.apache.ignite.internal.util.IgniteUtils#property if method is already
accessible. This will save from security exception;
* you may use public methods from com.sun.management.OperatingSystemMXBean for
these metrics.
What do you think?
> CpuLoad metric return -1 under Java 11
> --------------------------------------
>
> Key: IGNITE-13306
> URL: https://issues.apache.org/jira/browse/IGNITE-13306
> Project: Ignite
> Issue Type: Bug
> Affects Versions: 2.8.1
> Reporter: Mirza Aliev
> Assignee: Mirza Aliev
> Priority: Major
> Fix For: 2.9
>
>
> Start cluster under Java 11.
> Observed:
> CpuLoad metric will return -1
> Expected:
> Real CpuLoad.
> We investigated this issue and found that under Java 11 code failed with
> following trace:
> {code:java}
> class org.apache.ignite.IgniteException: Failed to get property value
> [property=processCpuTime,
> obj=com.sun.management.internal.OperatingSystemImpl@1dd92fe2] at
> org.apache.ignite.internal.util.IgniteUtils.property(IgniteUtils.java:8306)
> at
> org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$MetricsUpdater.getCpuLoad(GridDiscoveryManager.java:3131)
> at
> org.apache.ignite.internal.managers.discovery.GridDiscoveryManager$MetricsUpdater.run(GridDiscoveryManager.java:3093)
> at
> org.apache.ignite.internal.processors.timeout.GridTimeoutProcessor$CancelableTask.onTimeout(GridTimeoutProcessor.java:364)
> at
> org.apache.ignite.internal.processors.timeout.GridTimeoutProcessor$TimeoutWorker.body(GridTimeoutProcessor.java:233)
> at
> org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:119) at
> java.base/java.lang.Thread.run(Thread.java:834) Caused by:
> java.lang.reflect.InaccessibleObjectException: Unable to make public long
> com.sun.management.internal.OperatingSystemImpl.getProcessCpuTime()
> accessible: module jdk.management does not "opens
> com.sun.management.internal" to unnamed module @35fb3008 at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:340)
> at
> java.base/java.lang.reflect.AccessibleObject.checkCanSetAccessible(AccessibleObject.java:280)
> at java.base/java.lang.reflect.Method.checkCanSetAccessible(Method.java:198)
> at java.base/java.lang.reflect.Method.setAccessible(Method.java:192) at
> org.apache.ignite.internal.util.IgniteUtils.property(IgniteUtils.java:8297)
> ... 6 more
> {code}
> Under Java 8 metric has expected value.
>
> Solution:
> The behaviour is expected because in Java 11 the CPU load metrics is moved to
> JDK internal module which is not accessible by default. Adding the following
> line to the jvm in which Ignite node is started should solve the issue:
> {noformat}
> --add-opens jdk.management/com.sun.management.internal=ALL-UNNAMED{noformat}
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