[hibernate-issues] [Hibernate-JIRA] Created: (HHH-2216) ClassCastException in SecondLevelCacheStatistics for cached Query

[Matt McGill (JIRA)]

ClassCastException in SecondLevelCacheStatistics for cached Query
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         Key: HHH-2216
         URL: http://opensource.atlassian.com/projects/hibernate/browse/HHH-2216
     Project: Hibernate3
        Type: Bug

  Components: core  
    Versions: 3.2.0.ga    
 Environment: Hibernate 3.0.5
    Reporter: Matt McGill


The following code in SecondLevelCacheStatistics.java produces a CCE when a Query has been cached, because of cast to CacheKey:

	public Map getEntries() {
		Map map = new HashMap();
		Iterator iter = cache.toMap().entrySet().iterator();
		while ( iter.hasNext() ) {
			Map.Entry me = (Map.Entry) iter.next();
			map.put( ( (CacheKey) me.getKey() ).getKey(), me.getValue() );
		}
		return map;
	}

To reproduce, turn on query caching and execute cachable query:

session.createQuery("from Foo")
  .setCacheable(true)
  .setCacheRegion("fooQuery")
  .list()

Then get entities in second level cache for the query region via statistics API:

sessionFactory
  .getStatistics()
  .getSecondLevelCacheStatistics("fooQuery")
  .getEntities()

Relevent portion of example stack trace:
java.lang.ClassCastException: org.hibernate.cache.QueryKey
	at org.hibernate.stat.SecondLevelCacheStatistics.getEntries(SecondLevelCacheStatistics.java:50)
	at edu.taylor.domain.person.CachingPersonDirectory.logSecondLevelCacheContents(CachingPersonDirectory.java:22)
	at edu.taylor.domain.person.CachingPersonDirectory.getPersonWithBannerId(CachingPersonDirectory.java:30)

Not sure whether 'major' is the right priority here. It's 'major' in the sense that it's a big hairy runtime crash, but it's not all /that/ important to me to log the contents of the 2nd level cache. Not hard to fix, in any event.

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