Could not open JPA EntityManager for transaction in Spring Test - spring

Question

I have a java project using Spring 3.0 , JPA 2.0 with MyEclipse IDE
Trying to convert some basic dao integration tests to spring and have run into a few issues. Here's my setup:
LevelDAO
public class LevelDAO extends JpaDaoSupport implements ILevelDAO
{
public void save(Level entity) {
logger.info("saving Level instance");
try {
getJpaTemplate().persist(entity);
logger.info("save successful");
} catch (RuntimeException re) {
logger.error("save failed", re);
throw re;
}
}
}
Unit Test
#Transactional
#RunWith(SpringJUnit4ClassRunner.class)
#ContextConfiguration({ "classpath:applicationContext.xml"})
#TransactionConfiguration(transactionManager="transactionManager", defaultRollback=false)
public class LevelDaoImplTests {
LevelDAO levelDao;
#Test
public void shouldSaveNewLevels() {
levelDao= new LevelDAO();
Level l = new Level();
l.setName = "test";
levelDao.save(l);
}
}
Persistence.Xml
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="t1" transaction-type="RESOURCE_LOCAL">
<provider>
org.eclipse.persistence.jpa.PersistenceProvider
</provider>
<class>com.nlg.model.Level</class>
<properties>
<property name="javax.persistence.jdbc.driver"
value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:mysql://myserver.rds.amazonaws.com:3306/" />
<property name="javax.persistence.jdbc.user" value="myuser" />
<property name="javax.persistence.jdbc.password" value="mypass" />
</properties>
</persistence-unit>
applicationContext.xml
<bean id="entityManagerFactory"
class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean">
<property name="persistenceUnitName" value="t1" />
</bean>
<bean id="transactionManager"
class="org.springframework.orm.jpa.JpaTransactionManager">
<property name="entityManagerFactory"
ref="entityManagerFactory" />
</bean>
<tx:annotation-driven transaction-manager="transactionManager" />
<bean
id="LevelDAO" class="com.nlg.model.LevelDAO">
<property name="entityManagerFactory"
ref="entityManagerFactory" />
</bean>
At first I recieved this
Value '2.0' of attribute 'version' of element 'persistence' is not valid
So reading another post which suggested changing this to "1.0"
and now recieve
java.lang.IllegalStateException: Failed to load ApplicationContext
That issue was resolved with the < provider > tag however hasn't fixed my issue:
org.springframework.transaction.CannotCreateTransactionException: Could not open JPA EntityManager for transaction; nested exception is Exception [EclipseLink-4021] (Eclipse Persistence Services - 1.0.2 (Build 20081024)): org.eclipse.persistence.exceptions.DatabaseException
Exception Description: Unable to acquire a connection from driver [null], user [null] and URL [null].
My concern is that by downgrading the version no. to "1.0" that I'm also overlooking the issue of compatibility within this stack. I have non-spring versions of these tests working, so any ideas on where I've gone wrong appreciated.
Thanks

Answer 1

Unable to acquire a connection from driver [null], user [null] and URL [null]
These are JPA 2.0 properties:
<property name="javax.persistence.jdbc.driver"
value="com.mysql.jdbc.Driver" />
<property name="javax.persistence.jdbc.url"
value="jdbc:mysql://myserver.rds.amazonaws.com:3306/" />
<property name="javax.persistence.jdbc.user" value="myuser" />
<property name="javax.persistence.jdbc.password" value="mypass" />
So if you switched back to 1.0, you'd probably want:
<property name="eclipelink.jdbc.url" value="jdbc:mysql://myserver.rds.amazonaws.com:3306/"/>
<property name="eclipelink.jdbc.user" value="myuser"/>
<property name="eclipelink.jdbc.driver" value="com.mysql.jdbc.Driver"/>
<property name="eclipelink.jdbc.password" value="mypass"/>
But then I would recommend to solve "that other problem" and stay with 2.0
Here is an example of JPA 2.0 over EclipseLink that works ( notice persistence version="2.0" ):
<?xml version="1.0" encoding="UTF-8"?>
<persistence version="2.0" xmlns="http://java.sun.com/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://java.sun.com/xml/ns/persistence http://java.sun.com/xml/ns/persistence/persistence_2_0.xsd">
<persistence-unit name="eclipselinktest" transaction-type="RESOURCE_LOCAL">
<provider>org.eclipse.persistence.jpa.PersistenceProvider</provider>
<!-- list all classes -->
<class>com.codesmuggler.model.User</class>
<properties>
<!-- some properties needed by persistence provider:
- driver
- db url
- db user name
- db user password -->
<property name="javax.persistence.target-database" value="PostgreSQL"/>
<property name="javax.persistence.logging.level" value="INFO"/>
<property name="javax.persistence.jdbc.driver" value="org.postgresql.Driver"/>
<property name="javax.persistence.jdbc.url" value="jdbc:postgresql://localhost:5432/testdb"/>
<property name="javax.persistence.jdbc.user" value="testuser"/>
<property name="javax.persistence.jdbc.password" value="testpassword"/>
<!-- for testing purpose every time application is launched drop and create tables
in production mode - this line should be removed or commented out
-->
<property name="eclipselink.ddl-generation" value="drop-and-create-tables" />
</properties>
</persistence-unit>
</persistence>
Take a look at the example in full