How to insert into database when using JTA + JPA with Spring

Question

I have a simple web application using JTA + JPA along with Spring (version 4). I am doing a XA transaction using Atomikos JTA transaction Manager. This transaction involves inserting EmployeeA entity into DatabaseA and another EmployeeB entity into another DatabaseB.

Strangely, the application does not throw any error but no enteries are inserted into the Databases.

public class JtaTest {

public static void main( String[] args ) {

    JtaTest test = new JtaTest();
    test.testMandatory();
}

private static void testMandatory() {

    final SpringContextUtil util = SpringContextUtil.instance();
    ApplicationContext ctx = util.getApplicationContext();


    final JtaEmployeeService employeeService = (JtaEmployeeService)ctx.getBean("jtaEmployeeService");
    EmployeeA a = new EmployeeA();
    a.setName("emp-a-1");
    a.setAge(30);

    EmployeeB b = new EmployeeB();
    a.setName("emp-b-1");
    a.setAge(31);

   try {
    employeeService.persistEmployees(a, b);
    } catch (Exception e) {
    e.printStackTrace();
}   
   System.out.println("success");
}
}

---

The service class implementation:

@Service("jtaEmployeeService")
public class JtaEmployeeServiceImpl implements JtaEmployeeService {

@Autowired
@Qualifier("employeea")
private GenericDao<Integer, EmployeeA> employeeADao;


@Autowired
@Qualifier("employeeb")
private GenericDao<Integer, EmployeeB> employeeBDao;

@Override

@Transactional( propagation=Propagation.REQUIRED, readOnly=false, isolation=Isolation.DEFAULT, rollbackFor=Exception.class)
public void persistEmployees(EmployeeA employeeA, EmployeeB employeeB)  throws Exception {
    employeeADao.save(employeeA);
    employeeBDao.save(employeeB);
    System.out.println("Saving employee A and employee B ");


}
}

The DAO implementation and interfaces:

---

@Repository("employeeb")
public class EmployeeBDaoImpl extends AbstractJTADaoDatabaseB implements
    GenericDao<Integer, EmployeeB> {

@Override
public void save(EmployeeB entity) {
    super.persist(entity);

}
}

@Repository("employeea")
public class EmployeeADaoImpl extends AbstractJTADaoDatabaseA implements
    GenericDao<Integer, EmployeeA> {

@Override
public void save(EmployeeA entity) {
    super.persist(entity);

}
}

public abstract class AbstractJTADaoDatabaseB {

@PersistenceContext(unitName = "persistenceUnitB")
@Qualifier("myManager")
private EntityManager entityManager;

public void persist(Object entity) {
    entityManager.persist(entity);

    // entityManager.flush();
}

protected EntityManager getEntityManager() {
    return entityManager;
}

}

public abstract class AbstractJTADaoDatabaseA {

@PersistenceContext(unitName = "persistenceUnitA")
@Qualifier("myManager")
private EntityManager entityManager;

public void persist(Object entity) {
    entityManager.persist(entity);
    // entityManager.flush();
}

protected EntityManager getEntityManager() {
    return entityManager;
}

}

Servlet-Context.xml

---

 <?xml version="1.0" encoding="UTF-8"?> <beans:beans xmlns="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd 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.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure --> <!-- Enables the Spring MVC @Controller programming model --> <annotation-driven /> <!-- Enables annotaion driven transactional support on springs --> <!-- <tx:annotation-driven transaction-manager="hTransactionManager"/> --> <!-- <tx:jta-transaction-manager transaction-manager="jtaTransactionManager"/> --> <tx:annotation-driven transaction-manager="jtaTransactionManager"/> <!-- list the packages which are annotated with springs annotaions like @controller, @repository, @service, @component only --> <context:component-scan base-package="com.goraksh.spring.tutorial.controller.business, com.goraksh.spring.tutorial.controller.rest, com.goraksh.spring.tutorial.service, com.goraksh.spring.tutorial.dao" /> <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <beans:property name="prefix" value="/WEB-INF/views/" /> <beans:property name="suffix" value=".jsp" /> </beans:bean> <beans:bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <beans:property name="location" value="classpath:application.properties"/> </beans:bean> <!-- <beans:bean id="sessionFactory" class="org.springframework.orm.hibernate4.annotation.AnnotationSessionFactoryBean"> --> <beans:bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <beans:property name="dataSource" ref="dataSource" /> <beans:property name="hibernateProperties"> <beans:props> <beans:prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</beans:prop> <!-- <beans:prop key="hibernate.current_session_context_class">thread</beans:prop> --> <beans:prop key="hibernate.show_sql">${hibernate.show_sql}</beans:prop> <beans:prop key="hibernate.format_sql">${hibernate.format_sql}</beans:prop> <beans:prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</beans:prop> <beans:prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</beans:prop> <beans:prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</beans:prop> <beans:prop key="net.sf.ehcache.configurationResourceName">${net.sf.ehcache.configurationResourceName}</beans:prop> </beans:props> </beans:property> <!--<beans:property name="annotatedClasses"> --> <!-- packagesToScan is meant to give the package where the javax.persistence.Entity classes are stored , recognised via their annotations--> <beans:property name="packagesToScan"> <beans:list> <beans:value>com.goraksh.spring.tutorial.model</beans:value> </beans:list> </beans:property> </beans:bean> <beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <beans:property name="driverClassName" value="${jdbc.driverClassName}"/> <beans:property name="url" value="${jdbc.url}"/> <beans:property name="username" value="${jdbc.username}"/> <beans:property name="password" value="${jdbc.password}"/> </beans:bean> <beans:bean id = "hTransactionManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <beans:property name = "sessionFactory" ref = "sessionFactory" /> </beans:bean> <!-- Jata transactions with Atomikos --> <beans:bean id="dataSourceA" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close"> <beans:property name="uniqueResourceName"><beans:value>DataSourceA</beans:value></beans:property> <beans:property name="xaDataSourceClassName"><beans:value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</beans:value></beans:property> <beans:property name="xaProperties"> <beans:props> <beans:prop key="databaseName">traningdb</beans:prop> <beans:prop key="serverName">localhost</beans:prop> <beans:prop key="port">3306</beans:prop> <beans:prop key="user">root</beans:prop> <beans:prop key="password">root</beans:prop> <beans:prop key="url">jdbc:mysql://localhost:3306/traningdb</beans:prop> </beans:props> </beans:property> <beans:property name="minPoolSize"><beans:value>1</beans:value></beans:property> </beans:bean> <beans:bean id="dataSourceB" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close"> <beans:property name="uniqueResourceName"><beans:value>DataSourceB</beans:value></beans:property> <beans:property name="xaDataSourceClassName"><beans:value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</beans:value></beans:property> <beans:property name="xaProperties"> <beans:props> <beans:prop key="databaseName">traningdb2</beans:prop> <beans:prop key="serverName">localhost</beans:prop> <beans:prop key="port">3306</beans:prop> <beans:prop key="user">root</beans:prop> <beans:prop key="password">root</beans:prop> <beans:prop key="url">jdbc:mysql://localhost:3306/traningdb2</beans:prop> </beans:props> </beans:property> <beans:property name="minPoolSize"> <beans:value>1</beans:value> </beans:property> </beans:bean> <beans:bean id="entityManagerFactoryA" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <beans:property name="persistenceXmlLocation"> <beans:value>classpath:META-INF/persistence.xml</beans:value> </beans:property> <beans:property name="persistenceUnitName" value="persistenceUnitA" /> <beans:property name="dataSource" ref="dataSourceA" /> <beans:property name="jpaVendorAdapter"> <beans:bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <beans:property name="showSql" value="true" /> <beans:property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" /> </beans:bean> </beans:property> </beans:bean> <beans:bean id="entityManagerFactoryB" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <beans:property name="persistenceXmlLocation"> <beans:value>classpath:META-INF/persistence.xml</beans:value> </beans:property> <beans:property name="persistenceUnitName" value="persistenceUnitB" /> <beans:property name="dataSource" ref="dataSourceB" /> <beans:property name="jpaVendorAdapter"> <beans:bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <beans:property name="showSql" value="true" /> <beans:property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" /> </beans:bean> </beans:property> </beans:bean> <beans:bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init" destroy-method="close"> <beans:property name="forceShutdown" value="false" /> <!-- <beans:property name="startupTransactionService" value="false" /> --> </beans:bean> <beans:bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp"> <beans:property name="transactionTimeout" value="300" /> </beans:bean> <beans:bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager" depends-on="atomikosTransactionManager,atomikosUserTransaction"> <beans:qualifier value="myManager"/> <beans:property name="transactionManager" ref="atomikosTransactionManager" /> <beans:property name="userTransaction" ref="atomikosUserTransaction" /> <beans:property name="allowCustomIsolationLevels" value="true" /> </beans:bean> </beans:beans> 

---

Persistence.xml

 <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" 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_0.xsd"> <persistence-unit name="persistenceUnitA" > <class>com.goraksh.spring.tutorial.model.EmployeeA</class> <exclude-unlisted-classes /> <properties> <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" /> </properties> </persistence-unit> <persistence-unit name="persistenceUnitB" > <class>com.goraksh.spring.tutorial.model.EmployeeB</class> <exclude-unlisted-classes /> <properties> <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" /> </properties> </persistence-unit> </persistence> 

Any help is highly solicited.

Answer 1

After lot of head-whacking and many hit-and-trial debugging, finally able to solve the problem. Looks like below property is required in the persistence.xml

hibernate.transaction.jta.platform

On a application server there are multiple options available as Different JTA paltform services

But since I needed one standalone JTA platform implementation so I added one of my own.

com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform

So here is my modified persistence.xml:

 <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" 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_0.xsd"> <persistence-unit name="persistenceUnitA" transaction-type="JTA" > <class>com.goraksh.spring.tutorial.model.EmployeeA</class> <exclude-unlisted-classes /> <properties> <property name="hibernate.transaction.jta.platform" value="com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform" /> <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" /> </properties> </persistence-unit> <persistence-unit name="persistenceUnitB" transaction-type="JTA"> <class>com.goraksh.spring.tutorial.model.EmployeeB</class> <exclude-unlisted-classes /> <properties> <property name="hibernate.transaction.jta.platform" value="com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform" /> <property name="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" /> </properties> </persistence-unit> </persistence> 

The source code for com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform

 package com.goraksh.spring.atomikos.jta.platform; import javax.transaction.TransactionManager; import javax.transaction.UserTransaction; import org.hibernate.engine.transaction.jta.platform.internal.AbstractJtaPlatform; import com.atomikos.icatch.jta.UserTransactionImp; import com.atomikos.icatch.jta.UserTransactionManager; public final class AtomikosJtaPlatform extends AbstractJtaPlatform { private TransactionManager utm = new UserTransactionManager(); private UserTransaction userTransaction = new UserTransactionImp(); /** * */ private static final long serialVersionUID = -74991083213512919L; @Override protected TransactionManager locateTransactionManager() { return utm; } @Override protected UserTransaction locateUserTransaction() { return userTransaction; } } 

Answer 2

After some additional tuning: 1. Removing all hibernate ( jpa properties ) from persistence.xml to the servlet-context.xml.

Added jpaProperties to EntityManagerFactoryA and EntityManagerFactoryB

---

Servlet-context.xml

 <?xml version="1.0" encoding="UTF-8"?> <beans:beans xmlns="http://www.springframework.org/schema/mvc" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:beans="http://www.springframework.org/schema/beans" xmlns:context="http://www.springframework.org/schema/context" xmlns:aop="http://www.springframework.org/schema/aop" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/mvc http://www.springframework.org/schema/mvc/spring-mvc.xsd 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.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx.xsd http://www.springframework.org/schema/aop http://www.springframework.org/schema/aop/spring-aop.xsd"> <!-- DispatcherServlet Context: defines this servlet's request-processing infrastructure --> <!-- Enables the Spring MVC @Controller programming model --> <annotation-driven /> <!-- Enables annotaion driven transactional support on springs --> <!-- <tx:annotation-driven transaction-manager="hTransactionManager"/> --> <!-- <tx:jta-transaction-manager transaction-manager="jtaTransactionManager"/> --> <tx:annotation-driven transaction-manager="jtaTransactionManager"/> <!-- list the packages which are annotated with springs annotaions like @controller, @repository, @service, @component only --> <context:component-scan base-package="com.goraksh.spring.tutorial.controller.business, com.goraksh.spring.tutorial.controller.rest, com.goraksh.spring.tutorial.service, com.goraksh.spring.tutorial.dao" /> <beans:bean class="org.springframework.web.servlet.view.InternalResourceViewResolver"> <beans:property name="prefix" value="/WEB-INF/views/" /> <beans:property name="suffix" value=".jsp" /> </beans:bean> <beans:bean class="org.springframework.beans.factory.config.PropertyPlaceholderConfigurer"> <beans:property name="location" value="classpath:application.properties"/> </beans:bean> <!-- <beans:bean id="sessionFactory" class="org.springframework.orm.hibernate4.annotation.AnnotationSessionFactoryBean"> --> <beans:bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean"> <beans:property name="dataSource" ref="dataSource" /> <beans:property name="hibernateProperties"> <beans:props> <beans:prop key="hibernate.dialect">org.hibernate.dialect.SQLServerDialect</beans:prop> <!-- <beans:prop key="hibernate.current_session_context_class">thread</beans:prop> --> <beans:prop key="hibernate.show_sql">${hibernate.show_sql}</beans:prop> <beans:prop key="hibernate.format_sql">${hibernate.format_sql}</beans:prop> <beans:prop key="hibernate.cache.region.factory_class">${hibernate.cache.region.factory_class}</beans:prop> <beans:prop key="hibernate.cache.use_second_level_cache">${hibernate.cache.use_second_level_cache}</beans:prop> <beans:prop key="hibernate.cache.use_query_cache">${hibernate.cache.use_query_cache}</beans:prop> <beans:prop key="net.sf.ehcache.configurationResourceName">${net.sf.ehcache.configurationResourceName}</beans:prop> </beans:props> </beans:property> <!--<beans:property name="annotatedClasses"> --> <!-- packagesToScan is meant to give the package where the javax.persistence.Entity classes are stored , recognised via their annotations--> <beans:property name="packagesToScan"> <beans:list> <beans:value>com.goraksh.spring.tutorial.model</beans:value> </beans:list> </beans:property> </beans:bean> <beans:bean id="dataSource" class="org.springframework.jdbc.datasource.DriverManagerDataSource"> <beans:property name="driverClassName" value="${jdbc.driverClassName}"/> <beans:property name="url" value="${jdbc.url}"/> <beans:property name="username" value="${jdbc.username}"/> <beans:property name="password" value="${jdbc.password}"/> </beans:bean> <beans:bean id = "hTransactionManager" class = "org.springframework.orm.hibernate4.HibernateTransactionManager"> <beans:property name = "sessionFactory" ref = "sessionFactory" /> </beans:bean> <!-- Jata transactions with Atomikos --> <beans:bean id="dataSourceA" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close"> <beans:property name="uniqueResourceName"><beans:value>DataSourceA</beans:value></beans:property> <beans:property name="xaDataSourceClassName"><beans:value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</beans:value></beans:property> <beans:property name="xaProperties"> <beans:props> <beans:prop key="databaseName">traningdb</beans:prop> <beans:prop key="serverName">localhost</beans:prop> <beans:prop key="port">3306</beans:prop> <beans:prop key="user">root</beans:prop> <beans:prop key="password">root</beans:prop> <beans:prop key="url">jdbc:mysql://localhost:3306/traningdb</beans:prop> </beans:props> </beans:property> <beans:property name="minPoolSize"><beans:value>1</beans:value></beans:property> </beans:bean> <beans:bean id="dataSourceB" class="com.atomikos.jdbc.AtomikosDataSourceBean" init-method="init" destroy-method="close"> <beans:property name="uniqueResourceName"><beans:value>DataSourceB</beans:value></beans:property> <beans:property name="xaDataSourceClassName"><beans:value>com.mysql.jdbc.jdbc2.optional.MysqlXADataSource</beans:value></beans:property> <beans:property name="xaProperties"> <beans:props> <beans:prop key="databaseName">traningdb2</beans:prop> <beans:prop key="serverName">localhost</beans:prop> <beans:prop key="port">3306</beans:prop> <beans:prop key="user">root</beans:prop> <beans:prop key="password">root</beans:prop> <beans:prop key="url">jdbc:mysql://localhost:3306/traningdb2</beans:prop> </beans:props> </beans:property> <beans:property name="minPoolSize"> <beans:value>1</beans:value> </beans:property> </beans:bean> <beans:bean id="entityManagerFactoryA" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <beans:property name="persistenceXmlLocation"> <beans:value>classpath:META-INF/persistence.xml</beans:value> </beans:property> <beans:property name="persistenceUnitName" value="persistenceUnitA" /> <beans:property name="dataSource" ref="dataSourceA" /> <beans:property name="jpaVendorAdapter"> <beans:bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <beans:property name="showSql" value="true" /> <beans:property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" /> </beans:bean> </beans:property> <beans:property name="jpaProperties"> <beans:map> <beans:entry key="hibernate.transaction.jta.platform" value-ref="atomikosJtaPlatform" /> <beans:entry key="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" /> </beans:map> </beans:property> </beans:bean> <beans:bean id="entityManagerFactoryB" class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> <beans:property name="persistenceXmlLocation"> <beans:value>classpath:META-INF/persistence.xml</beans:value> </beans:property> <beans:property name="persistenceUnitName" value="persistenceUnitB" /> <beans:property name="dataSource" ref="dataSourceB" /> <beans:property name="jpaVendorAdapter"> <beans:bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> <beans:property name="showSql" value="true" /> <beans:property name="databasePlatform" value="org.hibernate.dialect.MySQL5InnoDBDialect" /> </beans:bean> </beans:property> <beans:property name="jpaProperties"> <beans:map> <beans:entry key="hibernate.transaction.jta.platform" value-ref="atomikosJtaPlatform" /> <beans:entry key="hibernate.cache.region.factory_class" value="org.hibernate.cache.ehcache.SingletonEhCacheRegionFactory" /> </beans:map> </beans:property> </beans:bean> <beans:bean id="atomikosJtaPlatform" class="com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform"> <beans:constructor-arg index="0" ref="atomikosTransactionManager"/> <beans:constructor-arg index="1" ref="atomikosUserTransaction"/> </beans:bean> <beans:bean id="atomikosTransactionManager" class="com.atomikos.icatch.jta.UserTransactionManager" init-method="init" destroy-method="close"> <beans:property name="forceShutdown" value="false" /> <!-- <beans:property name="startupTransactionService" value="false" /> --> </beans:bean> <beans:bean id="atomikosUserTransaction" class="com.atomikos.icatch.jta.UserTransactionImp"> <beans:property name="transactionTimeout" value="300" /> </beans:bean> <beans:bean id="jtaTransactionManager" class="org.springframework.transaction.jta.JtaTransactionManager" depends-on="atomikosTransactionManager,atomikosUserTransaction"> <beans:qualifier value="myManager"/> <beans:property name="transactionManager" ref="atomikosTransactionManager" /> <beans:property name="userTransaction" ref="atomikosUserTransaction" /> <beans:property name="allowCustomIsolationLevels" value="true" /> </beans:bean> </beans:beans> 

---

Persistence.xml

 <?xml version="1.0" encoding="UTF-8"?> <persistence version="2.0" 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_0.xsd"> <persistence-unit name="persistenceUnitA" transaction-type="JTA" > <class>com.goraksh.spring.tutorial.model.EmployeeA</class> <exclude-unlisted-classes /> <properties> <!-- <property name="hibernate.transaction.jta.platform" value="com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform" /> --> </properties> </persistence-unit> <persistence-unit name="persistenceUnitB" transaction-type="JTA"> <class>com.goraksh.spring.tutorial.model.EmployeeB</class> <exclude-unlisted-classes /> <properties> <!-- <property name="hibernate.transaction.jta.platform" value="com.goraksh.spring.atomikos.jta.platform.AtomikosJtaPlatform" /> --> </properties> </persistence-unit> </persistence>