Not allowed to create transaction on shared EntityManager - use Spring transactions or EJB CMT

Question

This post is in continuation of JPA How to get the value from database after persist

When I execute the following I am getting following exception, how can I resolve this?

Not allowed to create transaction on shared EntityManager - use Spring  transactions or EJB CMT 

DAOImpl code

public void create(Project project) {         entityManager.persist(project);         entityManager.getTransaction().commit();         project = entityManager.find(Project.class, project.getProjectId());         entityManager.refresh(project);         System.out.println("Id    -- " + project.getProjectId());             System.out.println("no -- " + project.getProjectNo());     } 

applicationContext.xml

<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-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/context http://www.springframework.org/schema/context/spring-context-3.0.xsd">      <bean id="DataSource"         class="org.springframework.jdbc.datasource.DriverManagerDataSource">         <property name="username" value="scott" />         <property name="password" value="tiger" />         <property name="driverClassName" value="oracle.jdbc.driver.OracleDriver" />         <property name="url" value="jdbc:oracle:thin:@myserver:1521:ORCL" />     </bean>      <bean id="entityManagerFactory"         class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean">         <property name="dataSource" ref="DataSource" />         <property name="packagesToScan" value="test.entity" />         <property name="jpaVendorAdapter">             <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter">                 <property name="showSql" value="true" />                 <property name="generateDdl" value="false" />                 <property name="databasePlatform" value="org.hibernate.dialect.Oracle10gDialect" />             </bean>         </property>     </bean>      <context:component-scan base-package="test.net" />      <tx:annotation-driven transaction-manager="transactionManager"/>        <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager">         <property name="entityManagerFactory" ref="entityManagerFactory" />     </bean>                <context:annotation-config/>  </beans> 

Answer 1

I guess the problem here is that although you have defined the bean for the transaction manager, you haven't annotated the create() method with @Transactional which enables spring transactions.

Also remove the entityManager.getTransaction().commit(); statement as now all the transaction management will be handled by spring, if you leave the statement as it is then you will get the same error again.