I have a JPA/Hibernate application and am trying to get it to run against H2 and MySQL. Currently I am using Atomikos for transactions and C3P0 for connection pooling.
Despite my best efforts I am still seeing this in the log file (and DAO integration tests are failing with org.hibernate.NonUniqueObjectException even though Spring Test should be rolling back the database after each test method):
[20100613 23:06:34] DEBUG [main] SessionFactoryImpl.(242) | instantiating session factory with properties: .....edited for brevity.... hibernate.connection.autocommit=true, ....more stuff follows
The connection URL to H2 has AUTOCOMMIT=OFF, but according to the H2 documentation:
this will not work as expected when
using a connection pool (the
connection pool manager will re-enable
autocommit when returning the
connection to the pool, so autocommit
will only be disabled the first time
the connection is used
So I figured (apparently correctly) that Hibernate is where I'll have to indicate I want autocommit
off. I found the autocommit property documented here and I put it in my EntityManagerFactory config as follows:
<bean id="myappTestLocalEmf" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="persistenceUnitName" value="myapp-core" />
<property name="persistenceUnitPostProcessors">
<bean class="com.myapp.core.persist.util.JtaPersistenceUnitPostProcessor">
<property name="jtaDataSource" ref="myappPersistTestJdbcDataSource" />
</bean>
</property>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
<property name="showSql" value="true" />
<property name="database" value="$DS{hibernate.database}" />
<property name="databasePlatform" value="$DS{hibernate.dialect}" />
</bean>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.transaction.factory_class">com.atomikos.icatch.jta.hibernate3.AtomikosJTATransactionFactory</prop>
<prop key="hibernate.transaction.manager_lookup_class">com.atomikos.icatch.jta.hibernate3.TransactionManagerLookup</prop>
<prop key="hibernate.connection.autocommit">false</prop>
<prop key="hibernate.format_sql">true"</prop>
<prop key="hibernate.use_sql_comments">true</prop>
</property>
</bean>
