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https://issues.apache.org/jira/browse/GEODE-5281?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16534952#comment-16534952
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ASF subversion and git services commented on GEODE-5281:
--------------------------------------------------------
Commit 29c71c96f2933e8380e412e9d14b42beb30ae96b in geode's branch
refs/heads/develop from [~balesh2]
[ https://gitbox.apache.org/repos/asf?p=geode.git;h=29c71c9 ]
GEODE-5281: replicate failure and fix bug (#2096)
* GEODE-5281: replicate failure and fix bug
- replicate the bad timing using a DUnit test
- fix the bug by only doing one lookup of MBeans
- add more tests
- fix potential NPE in waiting for regions to be ready on servers
Co-authored-by: Kenneth Howe <[email protected]>
* add TestingOnly annotation to setter
add a TestingOnly annotation to setter for ProxyFactory in the
FederatingManager for injecting test spies.
> Race between registering and unregistering CustomMXBeans in concurrent thread
> may result in NPE
> -----------------------------------------------------------------------------------------------
>
> Key: GEODE-5281
> URL: https://issues.apache.org/jira/browse/GEODE-5281
> Project: Geode
> Issue Type: Bug
> Components: jmx
> Affects Versions: 1.0.0-incubating
> Reporter: Kenneth Howe
> Assignee: Kenneth Howe
> Priority: Major
> Labels: pull-request-available
> Time Spent: 1h 10m
> Remaining Estimate: 0h
>
> Stack trace from an example of the unexpected NullPointerException in
> {{MBeanProxyFactory.createProxy()}}
> {code:java}
> [warning 2018/02/03 17:32:13.561 UTC
> managing_1_gemfire2_79a23c4a-f5e3-4c9f-6455-149c397ce13c_38199
> <pool-3-thread-4> tid=0x5e] Create Proxy failed for
> GemFire:type=CustomMXBean213,member=locator_managing_gemfire1_79a23c4a-f5e3-4c9f-6455-149c397ce13c_37116
> with exception null
> java.lang.NullPointerException
> at
> org.apache.geode.management.internal.MBeanProxyFactory.createProxy(MBeanProxyFactory.java:83)
> at
> org.apache.geode.management.internal.MBeanProxyFactory.createAllProxies(MBeanProxyFactory.java:137)
> at
> org.apache.geode.management.internal.FederatingManager$GIITask.call(FederatingManager.java:457)
> at
> org.apache.geode.management.internal.FederatingManager$GIITask.call(FederatingManager.java:341)
> at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> at
> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
> at
> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
> {code}
> The registering thread enters
> {code}
> public void createProxy(DistributedMember member, ObjectName objectName,
> Region<String, Object> monitoringRegion, Object newVal) {
> {code}
> with the {{objectName}} existing in the {{_monitoringRegion}}. A few lines
> further the entry is retrieved from the region, but is now {{null}} due to it
> being removed by the unregistering thread.
> {code}
> String name = objectName.toString();
> FederationComponent federationComponent = (FederationComponent)
> monitoringRegion.get(name);
> String interfaceClassName =
> federationComponent.getMBeanInterfaceClass();
> {code}
> {{federationComponent == null}} results in the NPE.
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