Databases
StackOverflow2013
Postsdbo
POConcurrent Creation Event
 

Note that there are some explanatory texts on larger screens.

plurals
  1. POConcurrent Creation Event
    primarykey
    data
    text
    <p>I'm using JBoss 5.1.0 GA together with Hibernate and I'm now trying to enable the second level cache. I've added the following properties to my Hibernate configuration.</p> <pre><code>&lt;property name="hibernate.cache.use_query_cache" value="true"/&gt; &lt;property name="hibernate.cache.use_second_level_cache" value="true"/&gt; &lt;property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.jbc2.MultiplexedJBossCacheRegionFactory"/&gt; &lt;property name="hibernate.cache.jbc2.query.localonly" value="true"/&gt; &lt;property name="hibernate.cache.region_prefix" value="my_prefix" /&gt; </code></pre> <p>And I've annotated entities that I expect to change infrequently with the following:</p> <pre><code>@Cache(usage=CacheConcurrencyStrategy.TRANSACTIONAL) </code></pre> <p>This is based on my understanding of the <a href="http://docs.jboss.org/jbossclustering/hibernate-caching/3.3/en-US/html_single/index.html" rel="nofollow">documentation</a>.</p> <p>The application successfully deploys with no scary looking messages (e.g. WARN or ERROR messages in the log stream). For a short period of time I see caching working (I'm using Hibernate statistics to see this), but after a short while I get stack traces of the form (even when logged on as a single user with no remote access whatsoever):</p> <blockquote> <p>"Transaction attempted to create MYCLASS anew. It has already been created since this transaction started, by another (possibly remote) transaction. We have a concurrent creation event"</p> </blockquote> <p>Following by a giant stack trace which eventually traces back to a named query that I have made which has the following form:</p> <pre><code>SELECT x FROM X WHERE x.deleted = false </code></pre> <p>The named query has no additional annotations for caching.</p> <p>Any advice on how to solve this problem would be greatly appreciated.</p>
    singulars
    1. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. PTQuestion
    1. This table or related slice is empty.
    1. USJeff Foster
    plurals
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. This table or related slice is empty.
    1. PO
      singulars
      1. PTAnswer
    2. PO
      singulars
      1. PTAnswer
    1. This table or related slice is empty.
    1. CONo sure that it will help, but I would try to play with locking and isolation settings of the cache.
      singulars
      1. POConcurrent Creation Event
      1. USStas
    2. COThis did help - switched to using pessimistic-entity rather than mvcc-entity and all is well again.
      singulars
      1. POConcurrent Creation Event
      1. USJeff Foster
 

Querying!

 
Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

SQuiL has stopped working due to an internal error.

If you are curious you may find further information in the browser console, which is accessible through the devtools (F12).

Reload