Java

JPA

This is a rough overview of configuration JPA with hibernate.

Pom.xml (Maven)

MySQL

 <dependency>
   <groupId>mysql</groupId>
   <artifactId>mysql-connector-java</artifactId>
   <version>8.0.20</version>
 </dependency>

Hibernate

 <dependency>
  <groupId>org.hibernate</groupId>
  <artifactId>hibernate-entitymanager</artifactId>
  <version>6.0.0.Alpha5</version>
  <type>pom</type>
 </dependency>

Jta

 <dependency>
   <groupId>javax.servlet</groupId>
   <artifactId>jstl</artifactId>
   <version>1.2</version>
 </dependency>

Spring Orm/JDBC

 <dependency>
   <groupId>springframework</groupId>
   <artifactId>spring-orm</artifactId>
   <version>1.2.6</version>
 </dependency>

 <dependency>
   <groupId>org.springframework</groupId>
   <artifactId>spring-jdbc</artifactId>
   <version>5.2.6.RELEASE</version>
 </dependency>

Persistence.xml

 <persistence 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_2.xsd" 
  version="2.2">
  <persistence-unit name="punit">
  </persistence-unit>	
 </persistence>

Web.xml

Started by the container to listen for context events

    <context-param>
    	<param-name>contextConfiguration</param-name>
    	<param-value>classPath:/jpaContext.xml</param-value>
    </context-param>
    
    <listener>
    	<listener-class>org.springframework.web.context.ContextLoaderListener</listener-class>
    </listener>

JpaContext.xml

Initial context

 <?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:tx="http://www.springframework.org/schema/tx "
	xmlns:context="http://www.springframework.org/schema/context"
	xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans.xsd
		http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-3.2.xsd
		http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-4.3.xsd">

	<context-annotation-config />
	<bean class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

 </beans>

Adding EntityManager and Properties

	<bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">
		<property name="perstistenceUnitName" value="punit"/>
		<property name="dataSource" value="dataSource"/>
		<property name="jpaVendorAdapter">
			<bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">
				<property name="showSql" value="true"></property>
			</bean>
		</property>
		
		<property name="jpaPropertyMap">
			<map>
				<entry key="hibernate.dialect" value="org.hibernate.dialect.MySQL5InnoDBDialect" />
				<entry key="hibernate.hb2ddl.auto" value="true" />
				<entry key="hibernate.format_sql" value="true" />
			</map>				
		</property>
	</bean>

Add Transaction Manager and Properties

	<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">
		<property name="entityManagerFactory" ref="entityManagerFactory"></property>
	</bean>
	
	<tx:annotation-driven transaction-manager="transactionManager" />