dispatcher-servlet.xml

<?xml version="1.0" encoding="UTF-8"?>
<beans xmlns="http://www.springframework.org/schema/beans"
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xmlns:context="http://www.springframework.org/schema/context"
	xmlns:mvc="http://www.springframework.org/schema/mvc"
	xmlns:p="http://www.springframework.org/schema/p" 
	xmlns:tx="http://www.springframework.org/schema/tx"
	xmlns:jdbc="http://www.springframework.org/schema/jdbc" 
	xsi:schemaLocation="
		http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.0.xsd
		http://www.springframework.org/schema/jdbc http://www.springframework.org/schema/jdbc/spring-jdbc-3.0.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd
		http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc-3.0.xsd"
		>
	
    
    <!-- Specifying base package for which, it will be scaned for any of these, 
    @Component, @Controller, @Service, @Repository Annotation--> 
	<context:component-scan base-package="com.spring_jetty"></context:component-scan>
	
	<!-- Specifying path to the wiring property file 
		`classpath` here refers to the `src/main/resource`
	-->
	<context:property-placeholder location="classpath:wiring.properties" ignore-unresolvable="true"/>
	
	
	<mvc:annotation-driven/>
	
	<!-- *************** Hibernate Configuration ****************-->
	
	<!-- Initializing `SessionFactory` bean -->
	<bean id="sessionFactory"
	    class="org.springframework.orm.hibernate3.annotation.AnnotationSessionFactoryBean">
	    
	    <!--  ``ref="dataSource"`` referes to the dataSource bean defined below with ``id="dataSource"``-->
	    <property name="dataSource" ref="dataSource" />
	    <property name="packagesToScan" value="com.spring_jetty.entities" />
	    <property name="hibernateProperties">
	        <props>
	            <prop key="hibernate.dialect">${hibernate.dialect}</prop>
	            <prop key="hibernate.hbm2ddl.auto">${hibernate.hbm2ddl.auto}</prop>
	            
	        </props>
	    </property>
	</bean>
	
	<!-- Initializing the dataSource bean for `SessionFacrory` -->
	<bean id="dataSource"
	    class="org.apache.commons.dbcp.BasicDataSource" destroy-method="close">
	    
	    <!-- Values like `jdbc.url`, `jdbc.username` etc are defined inside wiring.properties file -->
	    <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>
	
	<!-- Initializing `HibernateTransactionManager` bean
		Basic Explanation of it can be found here:
			http://stackoverflow.com/questions/21625282/why-is-hibernatetransactionmanager-required-in-spring 
	 
		 1) It is `PlatformTransactionManager` implementation for a single Hibernate SessionFactory.
		 2) Binds a Hibernate Session from the specified factory to the thread, potentially allowing for one 
			thread-bound Session per factory. `SessionFactoryUtils` and HibernateTemplate are aware of thread-bound 
			Sessions and participate in such transactions automatically
		 3) Using either of those or going through `SessionFactory.getCurrentSession()` is required for 
			Hibernate access code that needs to support this transaction handling mechanism.
			
			Detailed explanation of Spring Transaction Management can found here:
			http://docs.spring.io/autorepo/docs/spring/4.2.x/spring-framework-reference/html/transaction.html
	--> 
	<bean id="txManager" 
	    class="org.springframework.orm.hibernate3.HibernateTransactionManager">
        <property name="sessionFactory" ref="sessionFactory" />
	</bean>
	
	<!-- Enabling the configuration of transactional behavior based on annotations 
		REFER: http://stackoverflow.com/questions/2402329/what-does-txannotation-driven-in-spring-really-do-in-the-code-level 
	-->
	<tx:annotation-driven transaction-manager="txManager" />
	
</beans>