{"id":2557,"date":"2017-11-21T07:02:22","date_gmt":"2017-11-21T07:02:22","guid":{"rendered":"http:\/\/codethataint.com\/blog\/?p=2557"},"modified":"2017-11-21T09:23:41","modified_gmt":"2017-11-21T09:23:41","slug":"spring-and-jpa-integration","status":"publish","type":"post","link":"https:\/\/codethataint.com\/blog\/spring-and-jpa-integration\/","title":{"rendered":"Spring and JPA integration"},"content":{"rendered":"

application-context.xml<\/strong><\/p>\n

\r\n<?xml version="1.0" encoding="UTF-8"?>\r\n<beans xmlns="http:\/\/www.springframework.org\/schema\/beans"\r\n  xmlns:p="http:\/\/www.springframework.org\/schema\/p"\r\n  xmlns:context="http:\/\/www.springframework.org\/schema\/context"\r\n  xmlns:tx="http:\/\/www.springframework.org\/schema\/tx"\r\n  xmlns:xsi="http:\/\/www.w3.org\/2001\/XMLSchema-instance"\r\n  xmlns:aop="http:\/\/www.springframework.org\/schema\/aop"\r\n  xmlns:jdbc="http:\/\/www.springframework.org\/schema\/jdbc"\r\n  xsi:schemaLocation="\r\n   http:\/\/www.springframework.org\/schema\/beans\r\n   http:\/\/www.springframework.org\/schema\/beans\/spring-beans.xsd\r\n   http:\/\/www.springframework.org\/schema\/aop\r\n   http:\/\/www.springframework.org\/schema\/aop\/spring-aop.xsd\r\n   http:\/\/www.springframework.org\/schema\/tx\r\n   http:\/\/www.springframework.org\/schema\/tx\/spring-tx-3.0.xsd\r\n   http:\/\/www.springframework.org\/schema\/jdbc\r\n   http:\/\/www.springframework.org\/schema\/jdbc\/spring-jdbc-3.0.xsd\r\n   http:\/\/www.springframework.org\/schema\/context\r\n   http:\/\/www.springframework.org\/schema\/context\/spring-context-3.0.xsd">  \r\n   \r\n<context:component-scan base-package="mugil.org.*" \/>      \r\n<tx:annotation-driven transaction-manager="transactionManager"\/>\r\n  \r\n<bean id="transactionManager"\r\n  class="org.springframework.orm.jpa.JpaTransactionManager">\r\n     <property name="entityManagerFactory" ref="entityManagerFactory" \/>\r\n<\/bean>\r\n\r\n<bean id="entityManagerFactory"\r\nclass="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"\r\np:dataSource-ref="dataSource" p:persistenceUnitName="simple-jpa">\r\n <\/bean>\r\n  \r\n <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">\r\n        <property name="driverClassName" value="com.mysql.jdbc.Driver"\/>\r\n        <property name="url" value="jdbc:mysql:\/\/localhost:3306\/MUSIC_STORE"\/>\r\n        <property name="username" value="music_store"\/>\r\n        <property name="password" value="music_store"\/>  \r\n <\/bean>     \r\n<\/beans>\r\n<\/pre>\n
Dissection of application-context.xml<\/strong><\/p>\n
\r\n <context:component-scan base-package="mugil.org.*" \/>\r\n<\/pre>\n
    \n
  1. This component-scan tag also enables the usage of JPA annotations.<\/li>\n
  2. Enables the usage of JPA annotations(@Service, @Component, @Repository, @Controller  and etc.,)<\/li>\n
  3. annotation-config \u2014> enables the usage of JPA annotations , only in the beans specified in the context.xml whereas (ii) component-scan \u2014> scans through all the packages specified, records all the  project beans having JPA annotations, into this context.xml. Therefore it enables JPA annotaion usage in (beans specified in context.xml)+(Project Beans).Inshort, component-scan extends annotation-config.<\/li>\n<\/ol>\n
    Note:<\/strong>
    \nWhen we use component-scan in the app-context.xml, it\u2019s not necessary to use  annotation-config again.Even if both the tags are specified, it\u2019s not a problem because, the spring container would take care of running the process only once. <\/p>\n
    \r\n <tx:annotation-driven transaction-manager="transactionManager"\/>\r\n<\/pre>\n
      \n
    1. It checks for @Transactional annotation  in any of the classes. This tag is like a Transactional Switch that turns on the transactional behaviour.Here Transaction Manager is being injected<\/li>\n<\/ol>\n
      \r\n<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">\r\n   <property name="entityManagerFactory" ref="entityManagerFactory" \/>\r\n<\/bean>\r\n\r\n <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource">\r\n        <property name="driverClassName" value="com.mysql.jdbc.Driver"\/>\r\n        <property name="url" value="jdbc:mysql:\/\/localhost:3306\/MUSIC_STORE"\/>\r\n        <property name="username" value="music_store"\/>\r\n        <property name="password" value="music_store"\/>  \r\n <\/bean>     \r\n<\/pre>\n
        \n
      1. Here Transaction Manager is setup.EntityManagerFactory is being injected.<\/li>\n
      2. Here EntityManagerFactory is setup .Data Source reference and Persistence UnitName Reference is specified.\n<\/li>\n
      3. DB connection details are specified.<\/li>\n
      4. Based on the PersistenceUnit name, the corresponding portion of persistence.xml is accessed (a Project can have multiple persistenceUnitNames)<\/li>\n<\/ol>\n
        persistence-context.xml<\/strong><\/p>\n
        \r\n<?xml version="1.0" encoding="UTF-8"?>\r\n<persistence version="2.0" xmlns="http:\/\/java.sun.com\/xml\/ns\/persistence" xmlns:xsi="http:\/\/www.w3.org\/2001\/XMLSchema-instance" \r\n             xsi:schemaLocation="http:\/\/java.sun.com\/xml\/ns\/persistence http:\/\/java.sun.com\/xml\/ns\/persistence\/persistence_2_0.xsd">\r\n  <persistence-unit name="simple-jpa" transaction-type="RESOURCE_LOCAL">\r\n    <provider>org.hibernate.ejb.HibernatePersistence<\/provider>\r\n    <class>mugil.pojo.MusicDetails<\/class>\r\n    <exclude-unlisted-classes>true<\/exclude-unlisted-classes>\r\n    <properties>\r\n      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQLDialect"\/> \r\n      <property name="hibernate.show_sql" value="true"\/>\r\n      <property name="hibernate.max_fetch_depth" value="3"\/> \r\n    <\/properties>\r\n  <\/persistence-unit>\r\n<\/persistence>\r\n<\/pre>\n
        Dissection of persistence-context.xml<\/strong><\/p>\n
          \n
        1. persistence-unit – Defines the Name of the Persistence Unit<\/li>\n
        2. provider – ORM tool by which the underlying persistence would be accessed<\/li>\n
        3. class – Entity Class Names<\/li>\n
        4. properties – Defining the underlying persistence technology and other properties would be configured here<\/li>\n<\/ol>\n
          \"\"<\/p>\n
          Other Java Codes<\/strong>
          \nDaoInterface.java<\/strong><\/p>\n
          \r\npublic interface IMusicStoreDao \r\n{\r\n   public List getMusicList();\r\n}\r\n<\/pre>\n
          DaoImplementation.java<\/strong><\/p>\n
          \r\n@Service(value = "MusicCollections")\r\n@Repository(value = "MusicCollections")\r\n@Transactional\r\npublic class MusicStoreDaoImpl implements IMusicStoreDao{\r\n \r\n  @PersistenceContext(unitName = "simple-jpa")\r\n    private EntityManager entityManager;\r\n \r\n   @Override\r\n     public List getMusicList(){\r\n     List musicDetailsList= entityManager.createQuery("select c from MusicDetails c").getResultList();\r\n     return musicDetailsList;\r\n    }\r\n}\r\n<\/pre>\n
          Executer.java<\/strong><\/p>\n
          \r\npublic class Executer {\r\n   public static void main(String[] args){\r\n        ApplicationContext applicationContext=new ClassPathXmlApplicationContext("META-INF\/app-context.xml");\r\n        IMusicStoreDao musicStoreDao=(IMusicStoreDao) applicationContext.getBean("MusicCollections");\r\n        System.out.println("MusicList: \\n"+musicStoreDao.getMusicList());\r\n    }\r\n}\r\n<\/pre>\n
          Reference:<\/strong>
          \nSpring and JPA<\/a><\/p>\n","protected":false},"excerpt":{"rendered":"
          application-context.xml <?xml version="1.0" encoding="UTF-8"?> <beans xmlns="http:\/\/www.springframework.org\/schema\/beans" xmlns:p="http:\/\/www.springframework.org\/schema\/p" xmlns:context="http:\/\/www.springframework.org\/schema\/context" xmlns:tx="http:\/\/www.springframework.org\/schema\/tx" xmlns:xsi="http:\/\/www.w3.org\/2001\/XMLSchema-instance" xmlns:aop="http:\/\/www.springframework.org\/schema\/aop" xmlns:jdbc="http:\/\/www.springframework.org\/schema\/jdbc" xsi:schemaLocation=" http:\/\/www.springframework.org\/schema\/beans http:\/\/www.springframework.org\/schema\/beans\/spring-beans.xsd http:\/\/www.springframework.org\/schema\/aop http:\/\/www.springframework.org\/schema\/aop\/spring-aop.xsd http:\/\/www.springframework.org\/schema\/tx http:\/\/www.springframework.org\/schema\/tx\/spring-tx-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\/context http:\/\/www.springframework.org\/schema\/context\/spring-context-3.0.xsd"> <context:component-scan base-package="mugil.org.*" \/> <tx:annotation-driven transaction-manager="transactionManager"\/> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" \/> <\/bean> <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean" p:dataSource-ref="dataSource" p:persistenceUnitName="simple-jpa"> <\/bean> <bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <property name="driverClassName" value="com.mysql.jdbc.Driver"\/> <property name="url" value="jdbc:mysql:\/\/localhost:3306\/MUSIC_STORE"\/> <property name="username" value="music_store"\/> <property… Continue reading →<\/span><\/a><\/p>\n","protected":false},"author":1,"featured_media":0,"comment_status":"closed","ping_status":"open","sticky":false,"template":"","format":"standard","meta":{"footnotes":""},"categories":[235],"tags":[],"class_list":["post-2557","post","type-post","status-publish","format-standard","hentry","category-jpa"],"_links":{"self":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts\/2557","targetHints":{"allow":["GET"]}}],"collection":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts"}],"about":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/types\/post"}],"author":[{"embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/users\/1"}],"replies":[{"embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/comments?post=2557"}],"version-history":[{"count":15,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts\/2557\/revisions"}],"predecessor-version":[{"id":2574,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/posts\/2557\/revisions\/2574"}],"wp:attachment":[{"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/media?parent=2557"}],"wp:term":[{"taxonomy":"category","embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/categories?post=2557"},{"taxonomy":"post_tag","embeddable":true,"href":"https:\/\/codethataint.com\/blog\/wp-json\/wp\/v2\/tags?post=2557"}],"curies":[{"name":"wp","href":"https:\/\/api.w.org\/{rel}","templated":true}]}}