July 2007 - hibernate-dev - Jboss List Archives

Caching result (UserTransaction) of jndi lookup in o.h.t.JTATransactionFactory

by Scott Marlow

Hi, I was seeing excessive object lock contention in the JBoss jndi naming service due to the following call sequence repeating in my application: "PooledInvokerThread-192.169.1.2: java.util.Hashtable.get :335 > PooledInvokerThread-192.169.1.2: org.jnp.interfaces.NamingContext.useAbsoluteName :1090 > PooledInvokerThread-192.169.1.2: org.jnp.interfaces.NamingContext.getObjectInstance :1123 > PooledInvokerThread-192.169.1.2: org.jnp.interfaces.NamingContext.getObjectInstanceWrapFailure :1142 > PooledInvokerThread-192.169.1.2: org.jnp.interfaces.NamingContext.lookup :705 > PooledInvokerThread-192.169.1.2: org.jnp.interfaces.NamingContext.lookup :587 > PooledInvokerThread-192.169.1.2: javax.naming.InitialContext.lookup :351 > PooledInvokerThread-192.169.1.2: org.hibernate.transaction.JTATransactionFactory.isTransactionInProgress :83 > PooledInvokerThread-192.169.1.2: org.hibernate.jdbc.JDBCContext.isTransactionInProgress :180 > PooledInvokerThread-192.169.1.2: org.hibernate.jdbc.JDBCContext.registerSynchronizationIfPossib :158 > PooledInvokerThread-192.169.1.2: org.hibernate.impl.SessionImpl.checkTransactionSynchStatus :1850 > PooledInvokerThread-192.169.1.2: org.hibernate.impl.SessionImpl.getEntityMode :1274 > PooledInvokerThread-192.169.1.2: org.hibernate.engine.StatefulPersistenceContext.addEntry :415 > PooledInvokerThread-192.169.1.2: org.hibernate.engine.StatefulPersistenceContext.addEntity :382 > PooledInvokerThread-192.169.1.2: org.hibernate.engine.TwoPhaseLoad.addUninitializedEntity :240 > PooledInvokerThread-192.169.1.2: org.hibernate.loader.Loader.loadFromResultSet :1358 > PooledInvokerThread-192.169.1.2: org.hibernate.loader.Loader.instanceNotYetLoaded :1300 > PooledInvokerThread-192.169.1.2: org.hibernate.loader.Loader.getRow :1197 > ..." My first thought was to improve the AS class org.jnp.interfaces.NamingContext to use a ConcurrentHashMap instead of Hashtable for the JNDI namespace. However, the Sun naming classes are dependent on Hashtable being used. I could copy the ConcurrentHashMap to a new Hashtable when needed but I didn't want to cause even more memory copying to occur in the JNDI name space handling (there is already way too much cloning going on). I started to attempt building a hybrid Hashtable class that is backed by a ConcurrentHashMap but then I received some excellent feedback on the AS dev forum. Adrian suggested caching the UserTransaction object in o.h.t.JTATransactionFactory, although he said that might not work for some applications. I tried this and it work great for me. Are there any cases where doing the "ut = ( UserTransaction ) context.lookup( utName )" at the time that method "configure(Properties props)" is invoked, would return a different value than later when "isTransactionInProgress()" is invoked? I think that getting the UserTransaction early is a good performance enhancement for JTATransactionFactory. Any disagreement? I'll Jira this and fix if we agree with the change. Scott

18 years, 10 months

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hibernate-db2-8.2-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
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hibernate-mysql-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
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hibernate-sqlserver-msjdbc-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
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Query on Supported Db versions

by Mario Ds Briggs

Hi, The community supported databases listed at http://hibernate.org/80.html, mentions a set of databases like oracle 9i, 10g, DB2 8.1 etc. On the dev list i find reports mentioning hibernate-DBXXX-testsuite build completed with TestSuite errors/success etc. Is it that the hibernate test suite is run against these set of database/database versions by the hibernate QA tool/process. thanks in advance Mario

18 years, 10 months

1
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hibernate-sqlserver-msjdbc-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
0
0 / 0

hibernate-sybase-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
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0 / 0

hibernate-mysql-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
0
0 / 0

hibernate-db2-8.2-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
0
0 / 0

hibernate-sqlserver-msjdbc-testsuite Build Completed With Testsuite Errors

by jboss-qa-internal＠redhat.com

18 years, 10 months

1
0
0 / 0

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hibernate-dev July 2007