CODEWITHSUNDEEP
javaspringjpadependency-injectionpersistence
Sajee
Sajee

Reputation: 4447

spring-mvc 3.0.5: what's the preferred way to instantiate the JPA entity manager

My current working code:

EntityManagerFactory emf = javax.persistence.Persistence.createEntityManagerFactory("TT-SpringMVCPU");
EntityManager em = emf.createEntityManager();

I would like to replace that with something like this:

@PersistenceContext(unitName = "TT-SpringMVCPU")
private EntityManager _entityManager;

When I try that, I get this error:

org.springframework.beans.factory.BeanCreationException: Error creating bean with name 'showController': Injection of persistence dependencies failed; nested exception is org.springframework.beans.factory.NoSuchBeanDefinitionException: No bean named 'TT-SpringMVCPU' is defined
    org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor.postProcessPropertyValues(PersistenceAnnotationBeanPostProcessor.java:341)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.populateBean(AbstractAutowireCapableBeanFactory.java:1074)
    org.springframework.beans.factory.support.AbstractAutowireCapableBeanFactory.doCreateBean(AbstractAutowireCapableBeanFactory.java:517)
...

What did I forget to configure?

Upvotes: 0

Views: 1604

Answers (2)

Pascal Thivent
Pascal Thivent

Reputation: 570365

What did I forget to configure?

Well, you didn't show anything :) Anyway, Using JPA in Spring without referencing Spring shows one way to do things:

Configuration

  • LocalEnityManagerFactoryBean to create the EntityManagerFactory
  • JpaTransactionManager to manager JPA transactions
  • <tx:annotation-driven /> to tell Spring to look for @Transactional
  • Your bean definition!

 

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

    <bean id="entityManagerFactory"
        class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean" />

    <bean id="productDaoImpl" class="product.ProductDaoImpl"/>

    <bean
        class="org.springframework.orm.jpa.support.PersistenceAnnotationBeanPostProcessor" />

    <bean class="org.springframework.orm.jpa.JpaTransactionManager">
        <property name="entityManagerFactory"
            ref="entityManagerFactory" />
    </bean>

    <tx:annotation-driven />

</beans>

That's it. Two annotations and four bean definitions.

Have a look.

See also

Upvotes: 2

matt b
matt b

Reputation: 139931

From the Spring reference manual: Three options for JPA setup in a Spring environment

Upvotes: 2

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