[jboss-jira] [JBoss JIRA] (WFLY-2593) Memory leak in JBoss AS / Hibernate JPA integration

[Michael Kozak (JIRA)]

     [ https://issues.jboss.org/browse/WFLY-2593?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Michael Kozak updated WFLY-2593:
--------------------------------

    Steps to Reproduce: 
Unpack a distribution of 7.1.1 community or EAP 6.2 beta. No changes are required to the configuration.

1. Deploy attached jmxp.ear.ear
2. Send a request to the application so a query gets executed:
     curl http://localhost:8080/jmxp/jmxp
     Expected output:
queries executed
Class is class org.hibernate.stat.internal.ConcurrentStatisticsImpl
3. Ask for queries:
    ./jboss-cli.sh --connect --command='/deployment=jmxp.ear.ear/subdeployment=jmxp.ejb.jar/subsystem=jpa/hibernate-persistence-unit=jmxp.ear.ear\/jmxp.ejb.jar\#fraudPU:read-children-resources(child-type=query-cache)'

First time the result is fine. On subsequent requests with jboss-cli.sh new elements will appear although no requests were issued to the application.

After a number of request (for example from a monitoring system) an OutOfMemoryError will occur.

  was:
Unpack a distribution of 7.1.1 community or EAP 6.2 beta. No changes are required to the configuration.

1. Deploy attached jmxp.ear.ear
2. Send a request to the application so a query gets executed:
     curl http://localhost:8080/jmxp/jmxp
     Expected output:
queries executed
Class is class org.hibernate.stat.internal.ConcurrentStatisticsImpl
3. Ask for queries:
    ./jboss-cli.sh --connect --command='/deployment=jmxp.ear.ear/subdeployment=jmxp.ejb.jar/subsystem=jpa/hibernate-persistence-unit=jmxp.ear.ear\/jmxp.ejb.jar\#fraudPU:read-children-resources(child-type=query-cache)'

First time the result is fine. On subsequent requests with jboss-cli.sh new elements will appear although no requests were issued to the application.

After a number of request (for example from a monitoring system) an OutOfMemoryException will occur.


    
> Memory leak in JBoss AS / Hibernate JPA integration
> ---------------------------------------------------
>
>                 Key: WFLY-2593
>                 URL: https://issues.jboss.org/browse/WFLY-2593
>             Project: WildFly
>          Issue Type: Bug
>      Security Level: Public(Everyone can see) 
>          Components: JPA / Hibernate
>    Affects Versions: No Release
>         Environment: JBoss 7.1.1
> JBoss EAP 6.2 beta
>            Reporter: Michael Kozak
>            Assignee: Scott Marlow
>            Priority: Critical
>             Fix For: No Release
>
>         Attachments: jmxp.ear.ear, jmxp.tar.gz
>
>
> The leak exists in AS integration code with Hibernate JPA. 
> When a persistence unit is deployed which has 2nd level cache and statistics enabled each query for "query-cache" elements produces new elements.
> The issue lies in org.jboss.as.jpa.hibernate4.management.HibernateStatisticsResource. getQueryNames() method requests query names from Hibernate and applies QueryName.queryName(query).getDisplayName() to change names. Then for all queries hasQuery() is called which invokes stats.getQueryStatistics(). Within this method Hibernate creates a new object to track the statistics because the name is not found.
> Possible solution is to reverse the work done by getDisplayName() but I'm not sure if it's the right thing to do.
> This issue arised when we deployed jmxproxy application which was queried from Zabbix installation. For some MBean queries the implementation visits all MBeans deployed on the server. This kills the JVM after about 7 days.

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