1.2.3. Default Hibernate options

Hibernate has many configuration properties. For the properties that you do not specify in the persistence.xml file, JBoss AS will provide a reasonable set of default values. The default Hibernate property values are specified in the jboss-as/server/production/deploy/ejb3.deployer/META-INF/persistence.properties file. Below is the persistence.properties file bundled in JBoss Enterprise Application Platform. Notice the options that are commented out. They give you an idea of available properties in your persistence.xml file. 
hibernate.transaction.manager_lookup_class=org.hibernate.transaction.JBossTransactionManagerLookup
#hibernate.connection.release_mode=after_statement
#hibernate.transaction.flush_before_completion=false
#hibernate.transaction.auto_close_session=false
#hibernate.query.factory_class=org.hibernate.hql.ast.ASTQueryTranslatorFactory
#hibernate.hbm2ddl.auto=create-drop
#hibernate.hbm2ddl.auto=create
hibernate.cache.provider_class=org.hibernate.cache.HashtableCacheProvider
# Clustered cache with TreeCache
#hibernate.cache.provider_class=org.jboss.ejb3.entity.TreeCacheProviderHook
#hibernate.treecache.mbean.object_name=jboss.cache:service=EJB3EntityTreeCache
#hibernate.dialect=org.hibernate.dialect.HSQLDialect
hibernate.jndi.java.naming.factory.initial=org.jnp.interfaces.NamingContextFactory
hibernate.jndi.java.naming.factory.url.pkgs=org.jboss.naming:org.jnp.interfaces
hibernate.bytecode.use_reflection_optimizer=false
# I don't think this is honored, but EJB3Deployer uses it
hibernate.bytecode.provider=javassist

Important

org.hibernate.dialect.HSQLDialect is considered depreciated, replacyed with org.hibernate.dialect.SybaseASE15Dialect. The above example has been left unmodified in order to maintain example cohesion.