Can Spring/JPA/Hibernate use simple JDBC-compliant driver?

Question

We have an application which uses a Spring container on the server which uses EJB3 entities and Hibernate to persist data in a PostgreSQL database.

I'd like to add another connection to a separate database using a separate EntityManager, but the vendor of the DBMS (Trifox Vortex) does not have a DataSource type driver.

Can the Hibernate EntityManager use a simple JDBC-compliant driver to implement EJB3 JPA persistence of Entities?

Do I need to have a specific Hibernate Dialect for the DBMS I'm connecting to?

For what it's worth, here's the XML definition of our current Entity Manager Factory in Spring:

  <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
    <property name="persistenceUnitName" value="UniWorks-EntityPersistenceUnit"/>
    <property name="dataSource" ref="dataSource"/>
    <property name="jpaDialect">
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
    </property>
    <property name="jpaVendorAdapter">
      <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
        <property name="showSql" value="${db.showsql}"/>
        <property name="generateDdl" value="${db.generate}"/>
        <property name="databasePlatform" value="org.hibernate.dialect.PostgreSQLDialect"/>
      </bean>
    </property>
    <property name="jpaProperties">
      <props>
        <prop key="hibernate.hbm2ddl.auto">${db.hbm2ddl}</prop>
      </props>
    </property>
  </bean>

UPDATE/PROGRESS: 21/3/13

After much to-ing and fro-ing with the Vendor, I managed to get their JDBC driver working with a simple Java test program.

Unfortunately, their JDBC driver is obviously not sufficient for Hibernate to get enough information as Spring fails to create the EntityManagerFactory with the following stack-trace:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'entityManagerFactory' defined in URL [bundle://222.0:0/META-INF/spring/cobol.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: UniWorks-CobolPersistenceUnit] Unable to build EntityManagerFactory
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1455)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:519)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.createBean(AbstractAutowireCapableBeanFactory.java:456)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory$1.getObject(AbstractBeanFactory.java:294)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.DefaultSingletonBeanRegistry.getSingleton(DefaultSingletonBeanRegistry.java:225)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.doGetBean(AbstractBeanFactory.java:291)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractBeanFactory.getBean(AbstractBeanFactory.java:193)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.DefaultListableBeanFactory.preInstantiateSingletons(DefaultListableBeanFactory.java:567)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.context.support.AbstractApplicationContext.finishBeanFactoryInitialization(AbstractApplicationContext.java:913)[59:org.springframework.context:3.1.1.RELEASE]
    at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.access$1600(AbstractDelegatedExecutionApplicationContext.java:69)[90:org.springframework.osgi.core:1.2.1]
    at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext$4.run(AbstractDelegatedExecutionApplicationContext.java:355)[90:org.springframework.osgi.core:1.2.1]
    at org.springframework.osgi.util.internal.PrivilegedUtils.executeWithCustomTCCL(PrivilegedUtils.java:85)[90:org.springframework.osgi.core:1.2.1]
    at org.springframework.osgi.context.support.AbstractDelegatedExecutionApplicationContext.completeRefresh(AbstractDelegatedExecutionApplicationContext.java:320)[90:org.springframework.osgi.core:1.2.1]
    at org.springframework.osgi.extender.internal.dependencies.startup.DependencyWaiterApplicationContextExecutor$CompleteRefreshTask.run(DependencyWaiterApplicationContextExecutor.java:132)[91:org.springframework.osgi.extender:1.2.1]
    at java.lang.Thread.run(Thread.java:662)[:1.6.0_24]
Caused by: javax.persistence.PersistenceException: [PersistenceUnit: UniWorks-CobolPersistenceUnit] Unable to build EntityManagerFactory
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:677)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.ejb.HibernatePersistence.createContainerEntityManagerFactory(HibernatePersistence.java:132)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean.createNativeEntityManagerFactory(LocalContainerEntityManagerFactoryBean.java:268)[64:org.springframework.orm:3.1.1.RELEASE]
    at org.springframework.orm.jpa.AbstractEntityManagerFactoryBean.afterPropertiesSet(AbstractEntityManagerFactoryBean.java:310)[64:org.springframework.orm:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.invokeInitMethods(AbstractAutowireCapableBeanFactory.java:1514)[58:org.springframework.beans:3.1.1.RELEASE]
    at org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.initializeBean(AbstractAutowireCapableBeanFactory.java:1452)[58:org.springframework.beans:3.1.1.RELEASE]
    ... 14 more
Caused by: org.hibernate.HibernateException: Unable to access java.sql.DatabaseMetaData to determine appropriate Dialect to use
    at org.hibernate.dialect.resolver.DialectFactory.determineDialect(DialectFactory.java:141)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.dialect.resolver.DialectFactory.buildDialect(DialectFactory.java:97)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:117)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.cfg.Configuration.buildSettingsInternal(Configuration.java:2119)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:2115)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1339)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.cfg.AnnotationConfiguration.buildSessionFactory(AnnotationConfiguration.java:867)[80:com.springsource.org.hibernate:3.3.2.GA]
    at org.hibernate.ejb.Ejb3Configuration.buildEntityManagerFactory(Ejb3Configuration.java:669)[80:com.springsource.org.hibernate:3.3.2.GA]
    ... 19 more
Caused by: java.sql.SQLException: getDatabaseMajorVersion: Not supported by VORTEXjdbc.
    at vortex.sql.vortexDbMetaData.getDatabaseMajorVersion(vortexDbMetaData.java:362)
    at org.hibernate.dialect.resolver.DialectFactory.determineDialect(DialectFactory.java:131)[80:com.springsource.org.hibernate:3.3.2.GA]
    ... 26 more

So it looks like I might have to write my own dialect sub-class. Anybody give me any pointers as to where to start looking, or what existing sub-class to extend?

Answer 1

This should work (SimpleDriverDataSource + org.springframework.orm.jpa.vendor.Database.DEFAULT):

   <bean id="dataSource" class="org.springframework.jdbc.datasource.SimpleDriverDataSource">
        <property name="driverClass" value="org.h2.Driver"/> <!-- put your driver here -->
        <property name="url" value="jdbc:h2:mem:test"/> <!-- put your jdbc url here -->
        <property name="username" value="sa"/>
        <property name="password" value=""/>
    </bean>

            <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
        <property name="dataSource" ref="dataSource"/>
        <property name="persistenceUnitName" value="TestPersistenceUnit"/>
        <property name="jpaDialect">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect"/>
        </property>
        <property name="jpaVendorAdapter">
            <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
                <property name="showSql" value="false"/>
                <property name="database" value="DEFAULT"/>
            </bean>
        </property>
    </bean>