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<a href="https://community.jboss.org/index.jspa" style="text-decoration: none; color: #E1E1E1">JBoss Community</a></h1>
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Is optimistic-entity an inappropriate configuration for a Hibernate 2nd level cache configuration?
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created by <a href="https://community.jboss.org/people/tmuldo">Tom Muldoon</a> in <i>JBoss Cache</i> - <a href="https://community.jboss.org/message/731346#731346">View the full discussion</a>
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<div class="jive-rendered-content"><p>After upgrading jgroups from 2.5.1 to 2.7.0GA, we encountered ClassNotFoundExceptions that we tracked down to class loader issues between swarmcache (our Hibernate 2<sup>nd</sup> level cache provider) and jgroups. To make a long story short, we’re now attempting a cut over to jboss cache.</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Some specifics…</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>JBoss AS 5.1.0.GA</p><p>hibernate-jbosscache2-3.3.1.GA</p><p>jbosscache-core 3.2.5GA </p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>With that said, here’s my hibernate configuration in which we ran into DataVersioningExceptions with queries…</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>{code:xml}</p><p>      <span style="font-family: 'Courier New'; color: teal; font-size: 10pt;"><</span><span style="font-family: 'Courier New'; color: #3f7f7f; font-size: 10pt;">property</span><span style="font-family: 'Courier New'; font-size: 10pt;"> <span style="color: #7f007f;">name</span><span style="color: black;">=</span><em style="color: #2a00ff;">"hibernate.cache.use_second_level_cache"</em> <span style="color: #7f007f;">value</span><span style="color: black;">=</span><em style="color: #2a00ff;">"true"</em> <span style="color: teal;">/></span></span></p><p>      <span style="font-family: 'Courier New'; color: teal; font-size: 10pt;"><</span><span style="font-family: 'Courier New'; color: #3f7f7f; font-size: 10pt;">property</span><span style="font-family: 'Courier New'; font-size: 10pt;"> <span style="color: #7f007f;">name</span><span style="color: black;">=</span><em style="color: #2a00ff;">"hibernate.cache.use_query_cache"</em> <span style="color: #7f007f;">value</span><span style="color: black;">=</span><em style="color: #2a00ff;">"true"</em> <span style="color: teal;">/></span></span></p><p>      <span style="font-family: 'Courier New'; color: teal; font-size: 10pt;"><</span><span style="font-family: 'Courier New'; color: #3f7f7f; font-size: 10pt;">property</span><span style="font-family: 'Courier New'; font-size: 10pt;"> <span style="color: #7f007f;">name</span><span style="color: black;">=</span><em style="color: #2a00ff;">"hibernate.cache.region.jbc2.query.localonly"</em> <span style="color: #7f007f;">value</span><span style="color: black;">=</span><em style="color: #2a00ff;">"true"</em> <span style="color: teal;">/></span></span></p><p>      <span style="font-family: 'Courier New'; color: teal; font-size: 10pt;"><</span><span style="font-family: 'Courier New'; color: #3f7f7f; font-size: 10pt;">property</span><span style="font-family: 'Courier New'; font-size: 10pt;"> <span style="color: #7f007f;">name</span><span style="color: black;">=</span><em style="color: #2a00ff;">"hibernate.cache.region.factory_class"</em> <span style="color: #7f007f;">value</span><span style="color: black;">=</span><em style="color: #2a00ff;">"org.hibernate.cache.jbc2.MultiplexedJBossCacheRegionFactory"</em> <span style="color: teal;">/></span></span></p><p>      <span style="font-family: 'Courier New'; color: teal; font-size: 10pt;"><</span><span style="font-family: 'Courier New'; color: #3f7f7f; font-size: 10pt;">property</span><span style="font-family: 'Courier New'; font-size: 10pt;"> <span style="color: #7f007f;">name</span><span style="color: black;">=</span><em style="color: #2a00ff;">"hibernate.cache.region_prefix"</em> <span style="color: #7f007f;">value</span><span style="color: black;">=</span><em style="color: #2a00ff;">"hibernate.firstbest"</em> <span style="color: teal;">/></span></span></p><p>{code}</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Is optimistic-entity an inappropriate configuration for a Hibernate 2<sup>nd</sup> level cache configuration? Assuming so, how do we deal with the DataVersioningExceptions? Is mvcc-entity a more appropriate configuration?</p><p style="min-height: 8pt; height: 8pt; padding: 0px;"> </p><p>Sincerely, Tom</p></div>
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