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Understanding DataSource, Session Factory, Transaction Manager and JPA Template

I am using a configuration in my spring-hibernate application. The configuration is given below. My Question is, what the purposes & duties of, DataSource, sessionFactory, Transaction Manager and JPA Template here. And why one bean id is used in another one.
<!-- DataSource -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<!-- Hibernate SessionFactory -->
<bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
<property name="packagesToScan" value="net.softengine.edu.model"/>
</bean>
<!-- Transaction Manager-->
<bean id="transactionManager" class="org.springframework.orm.hibernate4.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<!-- JPA Template -- >
<bean id="jpaTemplate" class="org.springframework.orm.hibernate4.HibernateTemplate">
<property name="sessionFactory" ref="sessionFactory"/>
</bean>
<tx:annotation-driven transaction-manager="transactionManager"/>

Spring xml constructor injection of JPA entity manager

I am using Spring in a standalone desktop application along with JPA and Hibernate. So what i need is a global entity manager, provided by spring. The thing is, i use the ClassPathXmlApplicationContext and constructor injection, because i prefer my classes to be totally free of any framework.
So a bean in my ApplicationContext.xml basically looks like this:
<bean id="bookingDAO" class="dk.gokartland.booking.dao.BookingDAO">
<constructor-arg name="entityManagerFactory" ref="entityManagerFactory"/>
</bean>
So i do the actual wiring myself.
So what i've done until now is pass the EntityManagerFactory to my DAOs, but this doesn't really work when i close it manually. So i would like to pass the same EntityManager around.
http://docs.spring.io/spring/docs/3.0.x/spring-framework-reference/html/orm.html#orm-jpa
The LocalEntityManagerFactoryBean sounds like what i need, but i do not know how to map it through the applicationContext.xml.
My current JPA configuration looks like:
<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="packagesToScan" value="dk.gokartland.booking.domain"/>
<property name="jpaVendorAdapter">
<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"/>
</property>
<property name="jpaProperties">
<props>
<prop key="hibernate.hbm2ddl.auto">create-drop</prop>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQL5Dialect</prop>
<prop key="hibernate.show_sql">true</prop>
</props>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="com.mysql.jdbc.Driver"/>
<property name="url" value="#{database['jdbc.url']}"/>
<property name="username" value="#{database['jdbc.username']}"/>
<property name="password" value="#{database['jdbc.password']}"/>
</bean>
Now somehow i need to be able to to something like this:
<bean id="bookingDAO" class="dk.gokartland.booking.dao.BookingDAO">
<constructor-arg name="entityManager" ref="entityManager"/>
</bean>
Hope someone has a simple solution :)

How to configure Hibernate inside Spring configuration file

I'm studying Spring MVC and Hibernate. I had no problems handling database connections and queries with Spring mvc (MySql DB).
Now, I'm trying to use Hibernate and I found it intricate:
create a hibernate configuration file, create a class for retrieving SessionFactory, create a xml file for any persistent object etc.
I'm sure there's a simplest way that allow me to do an easy configuration using just:
the Spring xml configuration file
annotation (in persistent object classes)
What iI want to reach is something like the following. I saw a similar code in an example, but now I'm no more able to find it on the internet
xxxx-servlet.xml
<bean id="SessionFactory" class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="packagesToScan" value="com.springgestioneerrori.model" />
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.MySQLDialect</prop>
<prop key="hibernate.connection.autocommit">true</prop>
<prop key="hibernate.show_sql">false</prop>
<prop key="hibernate.format_sql">true</prop>
<prop key="hibernate.use_sql_comments">false</prop>
</props>
</property>
</bean>
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource" >
<property name="driverClass" value="com.mysql.jdbc.Driver" />
<property name="jdbcUrl" value="jdbc:mysql://localhost:3306/dbName" />
<property name="user" value="root" />
<property name="password" value="root" />
</bean>
In the code above, I suppose, that what it's not correct is my dataSource bean. Does anybody know the way to reach my goal?
Thank everybody!

i think your properties names inside the 'data source' bean should be like the following :
<property name="driverClassName" value="com.mysql.jdbc.Driver" />
<property name="url" value="jdbc:mysql://localhost:3306/dbName" />
<property name="username" value="root" />
<property name="password" value="root" />
so instead of driverClass , it should be driverClassName and so on ..
and please refer to this answer here , it talks about using spring DriverManagerDataSource vs apache BasicDataSource .
Hope that Helps

Everything must be correct, but I'd want to offer you to use *.properties to keep connection configuration to your DB like that
in appContext.xml:
<!-- JDBC DataSource bean -->
<bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">
<property name="driverClassName" value="${jdbc.driverClassName}"/>
<property name="url" value="${jdbc.url}"/>
<property name="username" value="${jdbc.username}"/>
<property name="password" value="${jdbc.password}"/>
</bean>
<bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer">
<property name="locations">
<list>
<value>classpath:properties/database.properties</value>
</list>
</property>
</bean>
in database.properties:
jdbc.driverClassName = com.mysql.jdbc.Driver
jdbc.schema = schema
jdbc.url = jdbc:mysql://localhost:3306/schema
jdbc.username = root
jdbc.password = password
And what interferes you to use annotations in your classes?

Correctly setting up JTA Transaction Manager in Tomcat Server with Atomikos

How would I setup container-managed datasources and embedded Active MQ resources to JTATransactionManager for global Transactions?
I am using Tomcat 6 and installed Atomikos in it to support JTA. I use Hibernate for ORM. Here is my configuration:
<bean id="AtomikosTransactionManager"
class="com.atomikos.icatch.jta.UserTransactionManager"
init-method="init" destroy-method="close">
<!-- when close is called, should we force
transactions to terminate or not? -->
<property name="forceShutdown" value="false" />
</bean>
<bean id="AtomikosUserTransaction"
class="com.atomikos.icatch.jta.UserTransactionImp">
<property name="transactionTimeout" value="300" />
</bean>
<jee:jndi-lookup expected-type="javax.sql.DataSource" id="dataSource" jndi-name="jdbc/EDITSOLUTIONS"/>
<bean id="sessionFactory" class="org.springframework.orm.hibernate.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource"/>
<property name="mappingResources"/>
<list>
<value>../../src/editsolutions.hibernate.cfg.xml</value>
</list>
<property name="hibernateProperties">
<value>
hibernate.dialect=${hibernate.dialect}
</value>
</property>
</bean>
<bean id="activemq" class="org.apache.activemq.camel.component.ActiveMQComponent">
<property name="connectionFactory">
<bean class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL" value="failover://tcp://localhost:61616"/>
</bean>
</property>
</bean>
<bean id="jmsConnectionFactory"class="org.apache.activemq.ActiveMQConnectionFactory">
<property name="brokerURL" value="failover://tcp://localhost:61616"/>
</bean>
<bean name="txManager" class="org.springframework.transaction.jta.JtaTransactionManager">
<property name="transactionManager" ref="AtomikosTransactionManager" />
<property name="userTransaction" ref="AtomikosUserTransaction" />
</bean>
Spring documentation says that JTA Transaction Manager need not be told about resources. That's what I have done.
I have the following outstanding questions:
I am not sure whether Atomikos is integrated properly or not?
Is it OK to get the datasource from <jee:jndi-lookup>?
Is Hiberante configuration correct with respect to JTATransactionManager?
As it is embedded in JVM not managed by container, would JTATransactionManager be able to recognize ActimeMQ ?

Try with this very useful link: http://www.atomikos.com/Documentation/SpringIntegration
Remember to configure the datasource in this way:
<bean id="dataSourceA" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close">
<qualifier value="jmsRecoveryDatabaseSchema"/>
<property name="uniqueResourceName"><value>XADS1</value></property>
<property name="xaDataSourceClassName">
<value>oracle.jdbc.xa.client.OracleXADataSource</value>
</property>
<property name="xaProperties">
<props>
<prop key="URL">${jdbc.url}</prop>
<prop key="user">${jdbc.username}</prop>
<prop key="password">${jdbc.password}</prop>
</props>
</property>
<property name="poolSize"><value>1</value></property>
<property name="testQuery" value="SELECT 1 FROM DUAL"/>
</bean>
I hope it helps!

Get Dialect within some class inside Spring MVC + Hibernate application

I have Hibernate Transaction manager configured inside Spring MVC controller.
<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
<property name="driverClassName" value="org.postgresql.Driver" />
<property name="url" value="jdbc:postgresql://127.0.0.1/doolloop2" />
<property name="username" value="doolloop2" />
<property name="password" value="doolloop" />
</bean>
<bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
<property name="dataSource" ref="dataSource" />
<property name="mappingLocations">
<list>
<value>WEB-INF/mapping/User.hbm.xml</value>
</list>
</property>
<property name="hibernateProperties">
<props>
<prop key="hibernate.dialect">org.hibernate.dialect.PostgreSQLDialect</prop>
<prop key="hibernate.show_sql">true</prop>
<prop key="hibernate.hbm2ddl.auto">update</prop>
</props>
</property>
</bean>
<bean id="txManager" class="org.springframework.orm.hibernate3.HibernateTransactionManager">
<property name="sessionFactory" ref="sessionFactory" />
</bean>
In Addition, I have some class which needs to get Hibernate Dialect inside on of it method.
Is class is not Configured as bean inside Spring Framework.
How can I access Hibernate Dialect property from this class? I believe it should be some static class,but I don't know how can I do it. Please help.

You could separate the properties from the spring config. Put them in a properties file, then reference that in a PropertyPlaceholderConfigurer bean ( http://almaer.com/blog/spring-propertyplaceholderconfigurer-a-nice-clean-way-to-share ). Then you could inject that value into whatever bean it is that you need the value in the same way you are injecting it into the sessionFactory bean.