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Bug 1897602

Summary: Warnings when using ManagementFactory.getPlatformMBeanServer with -Xcheck:jni VM argument [rhel-7.9.z]
Product: Red Hat Enterprise Linux 7 Reporter: Francisco De Melo <fdemeloj>
Component: java-11-openjdkAssignee: Andrew John Hughes <ahughes>
Status: CLOSED ERRATA QA Contact: OpenJDK QA <java-qa>
Severity: unspecified Docs Contact:
Priority: unspecified    
Version: 7.9CC: ahughes, jreznik, jvanek, sgehwolf
Target Milestone: rcKeywords: Triaged, ZStream
Target Release: ---Flags: ahughes: mirror+
Hardware: Unspecified   
OS: Unspecified   
Whiteboard:
Fixed In Version: java-11-openjdk-11.0.10.0.9-1.el7_9 Doc Type: Bug Fix
Doc Text:
The method ManagementFactory.getPlatformMBeanServer() calls native code using the Java Native Interface (JNI). When running the method with the -Xcheck:jni option passed to the Java Virtual Machine (JVM), the native code was found to have a memory leak. This leak is fixed in this update.
 Story Points: ---
Clone Of: Environment:
Last Closed: 2021-03-16 13:58:13 UTC Type: Bug
Regression: --- Mount Type: ---
Documentation: --- CRM:
Verified Versions: Category: ---
oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
Cloudforms Team: --- Target Upstream Version:
Embargoed:
Attachments:
Description Flags
output_jni_test
none
ManagementFactory.getPlatformMBeanServer none

Description Francisco De Melo 2020-11-13 15:42:08 UTC 
Created attachment 1729128 [details]
output_jni_test

Description of problem: 

When using ManagementFactory.getPlatformMBeanServer() with -Xcheck:jni VM argument

Several warnings appear on the log:
~~
WARNING: JNI local refs: 693, exceeds capacity: 692
    at com.sun.management.internal.DiagnosticCommandImpl.getDiagnosticCommandInfo(jdk.management.1/Native Method)
    at com.sun.management.internal.DiagnosticCommandImpl.getMBeanInfo(jdk.management.1/DiagnosticCommandImpl.java:196)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(java.management.1/DefaultMBeanServerInterceptor.java:329)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(java.management.1/DefaultMBeanServerInterceptor.java:315)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(java.management.1/JmxMBeanServer.java:522)
    at java.lang.management.ManagementFactory.lambda$addMXBean$7(java.management.1/ManagementFactory.java:901)
    at java.lang.management.ManagementFactory$$Lambda$22/0x0000000800098c40.run(java.management.1/Unknown Source)
    at java.security.AccessController.doPrivileged(java.base.1/Native Method)
    at java.lang.management.ManagementFactory.addMXBean(java.management.1/ManagementFactory.java:891)
    at java.lang.management.ManagementFactory.lambda$getPlatformMBeanServer$1(java.management.1/ManagementFactory.java:488)
    at java.lang.management.ManagementFactory$$Lambda$21/0x0000000800098840.accept(java.management.1/Unknown Source)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(java.base.1/ForEachOps.java:183)
    at java.util.Collections$2.tryAdvance(java.base.1/Collections.java:4745)
    at java.util.Collections$2.forEachRemaining(java.base.1/Collections.java:4753)
    at java.util.stream.ReferencePipeline$Head.forEach(java.base.1/ReferencePipeline.java:658)
    at java.util.stream.ReferencePipeline$7$1.accept(java.base.1/ReferencePipeline.java:274)
    at java.util.stream.ReferencePipeline$2$1.accept(java.base.1/ReferencePipeline.java:177)
    at java.util.HashMap$ValueSpliterator.forEachRemaining(java.base.1/HashMap.java:1675)
    at java.util.stream.AbstractPipeline.copyInto(java.base.1/AbstractPipeline.java:484)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(java.base.1/AbstractPipeline.java:474)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(java.base.1/ForEachOps.java:150)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(java.base.1/ForEachOps.java:173)
    at java.util.stream.AbstractPipeline.evaluate(java.base.1/AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(java.base.1/ReferencePipeline.java:497)
    at java.lang.management.ManagementFactory.getPlatformMBeanServer(java.management.1/ManagementFactory.java:488)
    - locked <0x000000071c61e488> (a java.lang.Class for java.lang.management.ManagementFactory)
    at TestDiagnosticCommandImpl.main(TestDiagnosticCommandImpl.java:3)
WARNING: JNI local refs: 726, exceeds capacity: 725
    at com.sun.management.internal.DiagnosticCommandImpl.getDiagnosticCommandInfo(jdk.management.1/Native Method)
    at com.sun.management.internal.DiagnosticCommandImpl.getMBeanInfo(jdk.management.1/DiagnosticCommandImpl.java:196)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(java.management.1/DefaultMBeanServerInterceptor.java:329)
    at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(java.management.1/DefaultMBeanServerInterceptor.java:315)
    at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(java.management.1/JmxMBeanServer.java:522)
    at java.lang.management.ManagementFactory.lambda$addMXBean$7(java.management.1/ManagementFactory.java:901)
    at java.lang.management.ManagementFactory$$Lambda$22/0x0000000800098c40.run(java.management.1/Unknown Source)
    at java.security.AccessController.doPrivileged(java.base.1/Native Method)
    at java.lang.management.ManagementFactory.addMXBean(java.management.1/ManagementFactory.java:891)
    at java.lang.management.ManagementFactory.lambda$getPlatformMBeanServer$1(java.management.1/ManagementFactory.java:488)
    at java.lang.management.ManagementFactory$$Lambda$21/0x0000000800098840.accept(java.management.1/Unknown Source)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(java.base.1/ForEachOps.java:183)
    at java.util.Collections$2.tryAdvance(java.base.1/Collections.java:4745)
    at java.util.Collections$2.forEachRemaining(java.base.1/Collections.java:4753)
    at java.util.stream.ReferencePipeline$Head.forEach(java.base.1/ReferencePipeline.java:658)
    at java.util.stream.ReferencePipeline$7$1.accept(java.base.1/ReferencePipeline.java:274)
    at java.util.stream.ReferencePipeline$2$1.accept(java.base.1/ReferencePipeline.java:177)
    at java.util.HashMap$ValueSpliterator.forEachRemaining(java.base.1/HashMap.java:1675)
    at java.util.stream.AbstractPipeline.copyInto(java.base.1/AbstractPipeline.java:484)
    at java.util.stream.AbstractPipeline.wrapAndCopyInto(java.base.1/AbstractPipeline.java:474)
    at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(java.base.1/ForEachOps.java:150)
    at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(java.base.1/ForEachOps.java:173)
    at java.util.stream.AbstractPipeline.evaluate(java.base.1/AbstractPipeline.java:234)
    at java.util.stream.ReferencePipeline.forEach(java.base.1/ReferencePipeline.java:497)
    at java.lang.management.ManagementFactory.getPlatformMBeanServer(java.management.1/ManagementFactory.java:488)
    - locked <0x000000071c61e488> (a java.lang.Class for java.lang.management.ManagementFactory)
    at TestDiagnosticCommandImpl.main(TestDiagnosticCommandImpl.java:3)
WARNING: JNI local refs: 759, exceeds capacity: 758
~~

Version-Release number of selected component (if applicable):


How reproducible:
Always

Steps to Reproduce:
1. public class TestDiagnosticCommandImpl {
	public static void main(String[] args) {
		System.out.println(java.lang.management.ManagementFactory.getPlatformMBeanServer());
	}
}

2. run with  -Xcheck:jni 

Actual results:
Several warnings when using ManagementFactory

Expected results:
Less warnings - maybe even none warning

Additional info:
Attach the reproducer and the output
Comment 2 Francisco De Melo 2020-11-13 15:43:03 UTC 
Created attachment 1729129 [details]
ManagementFactory.getPlatformMBeanServer

Test with ManagementFactory.getPlatformMBeanServer
Comment 3 Francisco De Melo 2020-12-21 15:33:09 UTC 
Hi, can someone acknowledge pls?
Comment 4 Severin Gehwolf 2020-12-22 19:58:56 UTC 
Yes, this is reproducible in JDK head too:

$ ./build/linux-x86_64-server-release/images/jdk/bin/java -Xcheck:jni MbeanServerTest 
WARNING: JNI local refs: 33, exceeds capacity: 32
	at com.sun.management.internal.DiagnosticCommandImpl.getDiagnosticCommandInfo(jdk.management@17-internal/Native Method)
	at com.sun.management.internal.DiagnosticCommandImpl.getMBeanInfo(jdk.management@17-internal/DiagnosticCommandImpl.java:196)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(java.management@17-internal/DefaultMBeanServerInterceptor.java:329)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(java.management@17-internal/DefaultMBeanServerInterceptor.java:315)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(java.management@17-internal/JmxMBeanServer.java:522)
	at java.lang.management.ManagementFactory.lambda$addMXBean$7(java.management@17-internal/ManagementFactory.java:902)
	at java.lang.management.ManagementFactory$$Lambda$22/0x0000000801057180.run(java.management@17-internal/Unknown Source)
	at java.security.AccessController.executePrivileged(java.base@17-internal/AccessController.java:784)
	at java.security.AccessController.doPrivileged(java.base@17-internal/AccessController.java:554)
	at java.lang.management.ManagementFactory.addMXBean(java.management@17-internal/ManagementFactory.java:892)
	at java.lang.management.ManagementFactory.lambda$getPlatformMBeanServer$1(java.management@17-internal/ManagementFactory.java:488)
	at java.lang.management.ManagementFactory$$Lambda$21/0x00000008010569f8.accept(java.management@17-internal/Unknown Source)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.accept(java.base@17-internal/ForEachOps.java:183)
	at java.util.Collections$2.tryAdvance(java.base@17-internal/Collections.java:4820)
	at java.util.Collections$2.forEachRemaining(java.base@17-internal/Collections.java:4828)
	at java.util.stream.ReferencePipeline$Head.forEach(java.base@17-internal/ReferencePipeline.java:762)
	at java.util.stream.ReferencePipeline$7$1.accept(java.base@17-internal/ReferencePipeline.java:276)
	at java.util.stream.ReferencePipeline$2$1.accept(java.base@17-internal/ReferencePipeline.java:179)
	at java.util.HashMap$ValueSpliterator.forEachRemaining(java.base@17-internal/HashMap.java:1766)
	at java.util.stream.AbstractPipeline.copyInto(java.base@17-internal/AbstractPipeline.java:484)
	at java.util.stream.AbstractPipeline.wrapAndCopyInto(java.base@17-internal/AbstractPipeline.java:474)
	at java.util.stream.ForEachOps$ForEachOp.evaluateSequential(java.base@17-internal/ForEachOps.java:150)
	at java.util.stream.ForEachOps$ForEachOp$OfRef.evaluateSequential(java.base@17-internal/ForEachOps.java:173)
	at java.util.stream.AbstractPipeline.evaluate(java.base@17-internal/AbstractPipeline.java:234)
	at java.util.stream.ReferencePipeline.forEach(java.base@17-internal/ReferencePipeline.java:596)
	at java.lang.management.ManagementFactory.getPlatformMBeanServer(java.management@17-internal/ManagementFactory.java:488)
	- locked <0x000000062f019688> (a java.lang.Class for java.lang.management.ManagementFactory)
	at MbeanServerTest.main(MbeanServerTest.java:3)

I've filed this upstream bug for it:
https://bugs.openjdk.java.net/browse/JDK-8258836
Comment 5 Severin Gehwolf 2021-01-25 11:15:18 UTC 
I've fixed JDK-8258836 in upstream head and will wait a bit before proposing this for 11u backport.
Comment 14 jiri vanek 2021-03-04 09:23:18 UTC 
As for https://bugs.openjdk.java.net/browse/JDK-8260436, it s already in 11u. Any plans with 8u?
Comment 15 Severin Gehwolf 2021-03-04 10:33:28 UTC 
(In reply to jiri vanek from comment #14)
> As for https://bugs.openjdk.java.net/browse/JDK-8260436, it s already in
> 11u. Any plans with 8u?

No, it's not an issue there.

Different bug.

$ /usr/lib/jvm/java-1.8.0-openjdk/bin/java -Xcheck:jni TestDiagnosticCommandImpl 
WARNING in native method: JNI call made without checking exceptions when required to from CallStaticObjectMethod
	at sun.management.DiagnosticCommandImpl.getDiagnosticCommandInfo(Native Method)
	at sun.management.DiagnosticCommandImpl.getMBeanInfo(DiagnosticCommandImpl.java:165)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getNewMBeanClassName(DefaultMBeanServerInterceptor.java:333)
	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.registerMBean(DefaultMBeanServerInterceptor.java:319)
	at com.sun.jmx.mbeanserver.JmxMBeanServer.registerMBean(JmxMBeanServer.java:522)
	at java.lang.management.ManagementFactory$3.run(ManagementFactory.java:889)
	at java.lang.management.ManagementFactory$3.run(ManagementFactory.java:884)
	at java.security.AccessController.doPrivileged(Native Method)
	at java.lang.management.ManagementFactory.addDynamicMBean(ManagementFactory.java:884)
	at java.lang.management.ManagementFactory.getPlatformMBeanServer(ManagementFactory.java:491)
	- locked <0x000000071ac62ac0> (a java.lang.Class for java.lang.management.ManagementFactory)
	at TestDiagnosticCommandImpl.main(TestDiagnosticCommandImpl.java:3)

Fixed in later JDKs with:
https://hg.openjdk.java.net/jdk-updates/jdk11u-dev/rev/a16236cd61d7
Comment 19 errata-xmlrpc 2021-03-16 13:58:13 UTC 
Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (java-11-openjdk bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:0869