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To use the context injection approach, you can declare an entity manager field in your DAO and annotate it with the @PersistenceContext annotation. Spring will inject an entity manager into this field for you to persist your objects. package com.apress.springenterpriserecipes.course.jpa; ... import javax.persistence.EntityManager; import javax.persistence.PersistenceContext; import javax.persistence.Query; import org.springframework.transaction.annotation.Transactional; public class JpaCourseDao implements CourseDao { @PersistenceContext private EntityManager entityManager; @Transactional public void store(Course course) { entityManager.merge(course); } @Transactional public void delete(Long courseId) { Course course = entityManager.find(Course.class, courseId); entityManager.remove(course); } @Transactional(readOnly = true) public Course findById(Long courseId) { return entityManager.find(Course.class, courseId); }

Spring 2.5 makes extensive enhancements to the auto-wiring feature. You can auto-wire a particular property by annotating a setter method, a constructor, a field, or even an arbitrary method with the @Autowired annotation, or the @Resource annotation defined in JSR-250: Common Annotations for the Java Platform. That means you have one more option besides setting the autowire attribute to satisfy your requirements. However, this annotation-based option requires you to be using Java 1.5 or higher.

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@Transactional(readOnly = true) public List<Course> findAll() { Query query = entityManager.createQuery("from Course"); return query.getResultList(); } } You can annotate each DAO method or the entire DAO class with @Transactional to make all these methods transactional. It ensures that the persistence operations within a DAO method will by executed in the same transaction and hence by the same entity manager. In the bean configuration file for JPA (i.e., beans-jpa.xml), you have to declare a JpaTransactionManager instance and enable declarative transaction management via <tx:annotation-driven>. You have to register a PersistenceAnnotationBeanPostProcessor instance to inject entity managers into properties annotated with @PersistenceContext. <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-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-2.5.xsd"> ... <tx:annotation-driven /> <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> <property name="entityManagerFactory" ref="entityManagerFactory" /> </bean> <bean name="courseDao" class="com.apress.springenterpriserecipes.course.jpa.JpaCourseDao" /> <bean class="org.springframework.orm.jpa.support. PersistenceAnnotationBeanPostProcessor" /> </beans> A PersistenceAnnotationBeanPostProcessor instance will be registered automatically once you enable the <context:annotation-config> element. So, you can delete its explicit bean declaration. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xmlns:tx="http://www.springframework.org/schema/tx" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-3.0.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd http://www.springframework.org/schema/tx http://www.springframework.org/schema/tx/spring-tx-3.0.xsd">

To ask Spring to auto-wire the bean properties with @Autowired or @Resource, you have to register an AutowiredAnnotationBeanPostProcessor instance in the IoC container. If you are using a bean factory, you have to register this bean post processor through the API. Otherwise, you can just declare an instance of it in your application context. <bean class="org.springframework.beans.factory.annotation. AutowiredAnnotationBeanPostProcessor" /> Or you can simply include the <context:annotation-config> element in your bean configuration file and an AutowiredAnnotationBeanPostProcessor instance will automatically get registered. <beans xmlns="http://www.springframework.org/schema/beans" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xmlns:context="http://www.springframework.org/schema/context" xsi:schemaLocation="http://www.springframework.org/schema/beans http://www.springframework.org/schema/beans/spring-beans-2.5.xsd http://www.springframework.org/schema/context http://www.springframework.org/schema/context/spring-context-2.5.xsd"> <context:annotation-config /> ... </beans>

Auto-Wiring a Single Bean of Compatible Type The @Autowired annotation can be applied to a particular property for Spring to auto-wire it. As an example, you can annotate the setter method of the prefixGenerator property with @Autowired. Then Spring will attempt to wire a bean whose type is compatible with PrefixGenerator. package com.apress.springrecipes.sequence; import org.springframework.beans.factory.annotation.Autowired; public class SequenceGenerator { ... @Autowired public void setPrefixGenerator(PrefixGenerator prefixGenerator) { this.prefixGenerator = prefixGenerator; } } If you have a bean whose type is compatible with PrefixGenerator defined in the IoC container, it will be set to the prefixGenerator property automatically.

<context:annotation-config /> ... </beans> This bean post processor can also inject the entity manager factory into a property with the @PersistenceUnit annotation. This allows you to create entity managers and manage transactions by yourself. It s no different from injecting the entity manager factory via a setter method. package com.apress.springenterpriserecipes.course.jpa; ... import javax.persistence.EntityManagerFactory; import javax.persistence.PersistenceUnit; public class JpaCourseDao implements CourseDao { @PersistenceContext private EntityManager entityManager; @PersistenceUnit private EntityManagerFactory entityManagerFactory; ... } Remember that JpaTemplate will translate the native JPA exceptions into exceptions in Spring s DataAccessException hierarchy. However, when calling native methods on a JPA entity manager, the exceptions thrown will be of native type PersistenceException, or other Java SE exceptions like IllegalArgumentException and IllegalStateException. If you want JPA exceptions to be translated into Spring s DataAccessException, you have to apply the @Repository annotation to your DAO class. package com.apress.springenterpriserecipes.course.jpa; ... import org.springframework.stereotype.Repository; @Repository("courseDao") public class JpaCourseDao implements CourseDao { ... } Then register a PersistenceExceptionTranslationPostProcessor instance to translate the native JPA exceptions into exceptions in Spring s DataAccessException hierarchy. You can also enable <context:component-scan> and delete the original JpaCourseDao bean declaration because @Repository is a stereotype annotation in Spring 2.5 and beyond. <beans ...> ... <context:component-scan base-package="com.apress.springenterpriserecipes.course.jpa" /> <bean class="org.springframework.dao.annotation.PersistenceException Translation PostProcessor" /> </beans>

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