Replace jpa persistence.xml with java based configuration in Spring

Jpa 's /META/INF/persistence.xml  with transaction-type set "RESOURCE_LOCAL"  can be replace in spring configuration.

The demo persistence.xml looks like below.

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<?xml version="1.0" encoding="UTF-8"?> <persistence version="2.1"   xmlns="http://xmlns.jcp.org/xml/ns/persistence" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"   xsi:schemaLocation="http://xmlns.jcp.org/xml/ns/persistence http://xmlns.jcp.org/xml/ns/persistence/persistence_2_1.xsd">   <persistence-unit name="hibernate-persistence"  transaction-type="RESOURCE_LOCAL">     <provider>org.hibernate.ejb.HibernatePersistence</provider>     <class>com.shengwang.demo.security.model.UserEntity</class>     <class>com.shengwang.demo.security.model.AuthorityEntity</class>     <exclude-unlisted-classes>false</exclude-unlisted-classes>     <properties>       <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver" />       <property name="javax.persistence.jdbc.url" value="jdbc:mysql://localhost:3306/spring" />       <property name="javax.persistence.jdbc.user" value="root" />       <property name="javax.persistence.jdbc.password" value="IHave1Dream!" />       <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/>               <!-- ================================== -->       <!-- some optional hibernate properties -->       <!-- ================================== -->       <property name="hibernate.hbm2ddl.auto" value="create"/>       <property name="hibernate.hbm2ddl.import_files" value="insert-data.sql"/>       <property name="hibernate.ejb.naming_strategy" value="org.hibernate.cfg.ImprovedNamingStrategy"/>     </properties>   </persistence-unit> </persistence>

This xml file can be replace with following spring config.

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package com.shengwang.demo;   // omit import   @Configuration @EnableJpaRepositories(basePackages = "com.shengwang.demo.model") public class RootConfig {     @Bean   public BasicDataSource dataSource() {     // org.apache.commons.dbcp.BasicDataSource     BasicDataSource basicDataSource = new BasicDataSource();     basicDataSource.setDriverClassName("com.mysql.jdbc.Driver");     basicDataSource.setUrl("jdbc:mysql://localhost:3306/spring");     basicDataSource.setUsername("root");     basicDataSource.setPassword("IHave1Dream!");     return basicDataSource;   }     @Bean   public LocalContainerEntityManagerFactoryBean entityManagerFactory(DataSource dataSource) {     LocalContainerEntityManagerFactoryBean entityManagerFactory = new LocalContainerEntityManagerFactoryBean(); //    entityManagerFactory.setPersistenceUnitName("hibernate-persistence");     entityManagerFactory.setDataSource(dataSource);     entityManagerFactory.setJpaVendorAdapter(new HibernateJpaVendorAdapter());     entityManagerFactory.setJpaDialect(new HibernateJpaDialect());     entityManagerFactory.setPackagesToScan("com.shengwang.demo.model");           entityManagerFactory.setJpaPropertyMap(hibernateJpaProperties());     return entityManagerFactory;   }     private Map<String, ?> hibernateJpaProperties() {     HashMap<String, String> properties = new HashMap<>();     properties.put("hibernate.hbm2ddl.auto", "create");     properties.put("hibernate.show_sql", "false");     properties.put("hibernate.format_sql", "false");     properties.put("hibernate.hbm2ddl.import_files", "insert-data.sql");     properties.put("hibernate.ejb.naming_strategy", "org.hibernate.cfg.ImprovedNamingStrategy");           properties.put("hibernate.c3p0.min_size", "2");     properties.put("hibernate.c3p0.max_size", "5");     properties.put("hibernate.c3p0.timeout", "300"); // 5mins           return properties;   }     @Bean   public JpaTransactionManager transactionManager(EntityManagerFactory emf) {     //org.springframework.orm.jpa.JpaTransactionManager     JpaTransactionManager jpaTransactionManager = new JpaTransactionManager();     jpaTransactionManager.setEntityManagerFactory(emf);     return jpaTransactionManager;   }   }

In the java-based config, first define a DataSource bean, then use this data source to create entityManagerFactory, finally use this entityManagerFactory bean to create a transactionManager bean.