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

[Michael Kozak (JIRA)]

Michael Kozak created WFLY-2593:
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             Summary: 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


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.

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