Spring + JPA + Hibernate

Question

Je suis débutant au printemps. J'essaie de mettre en place une application web simple avec Spring 3.1.3 et JPA 2.0 J'ai ajouté toutes les libs nécessaires à la librairie WEB-INF/lib. Il n'y a pas d'erreur lors du démarrage mais entityManager dans mon fichier DaoImpl est null. Alors, voici ma configuration:

persistance.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="fcmsServer" transaction-type="RESOURCE_LOCAL"> 
</persistence-unit> 
</persistence> 

FCMs-servlet.xml

<?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/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"> 

<!-- the application context definition for the fcmsServer DispatcherServlet --> 

<bean id="entityManagerFactory" 
    class="org.springframework.orm.jpa.LocalContainerEntityManagerFactoryBean"> 
    <property name="persistenceUnitName" value="fcmsServer" /> 
    <property name="dataSource" ref="dataSource" /> 
    <property name="jpaDialect"> 
     <bean class="org.springframework.orm.jpa.vendor.HibernateJpaDialect" /> 
    </property> 
    <property name="jpaVendorAdapter"> 
     <bean class="org.springframework.orm.jpa.vendor.HibernateJpaVendorAdapter"> 
      <property name="showSql" value="true" /> 
      <property name="generateDdl" value="true" /> 
      <property name="databasePlatform" value="org.hibernate.dialect.H2Dialect" /> 
     </bean> 
    </property> 
    <property name="persistenceUnitManager"> 
     <bean 
      class="org.springframework.orm.jpa.persistenceunit.DefaultPersistenceUnitManager"> 
      <property name="defaultDataSource" ref="dataSource" /> 
     </bean> 
    </property> 
</bean> 

<bean id="dataSource" class="org.apache.commons.dbcp.BasicDataSource" 
    destroy-method="close"> 
    <property name="driverClassName" value="org.h2.Driver" /> 
    <property name="url" value="jdbc:h2:tcp://localhost/~/fcms" /> 
    <property name="username" value="sa" /> 
    <property name="password" value="sa" /> 
</bean> 

<tx:annotation-driven transaction-manager="transactionManager" /> 
<bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> 
    <property name="entityManagerFactory" ref="entityManagerFactory" /> 
    <property name="dataSource" ref="dataSource" /> 
</bean> 

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


<bean id="userDao" class="fcms.data.user.UserDAOImpl"> 
</bean> 

<bean name="/user.htm" class="fcms.controller.UserController"> 
</bean> 

<bean id="viewResolver" 
    class="org.springframework.web.servlet.view.InternalResourceViewResolver"> 
    <property name="viewClass" 
     value="org.springframework.web.servlet.view.JstlView"></property> 
    <property name="prefix" value="/WEB-INF/jsp/"></property> 
    <property name="suffix" value=".jsp"></property> 
</bean> 

classe DaoImpl:

@Repository 
public class UserDAOImpl implements UserDAO { 
@PersistenceContext(unitName = "fcmsServer") 
private EntityManager entityManager; 

public void setEntityManager(EntityManager entityManager) { 
    this.entityManager = entityManager; 
} 

@Override 
public User getUserById(long id) { 
    return entityManager.find(User.class,id); 
} 

@Override 
public void addUser(User u) { 
    entityManager.persist(u); 
} 
} 

cl de l'utilisateur ass

@Entity 
@Table(name = "User") 
public class User implements Serializable { 


@Id @GeneratedValue 
private long id; 
@Column(name = "lastName", nullable = false) 
private String lastName; 
@Column(name = "firstName", nullable = false) 
private String firstName; 
@Column(name = "birthDate", nullable = true) 
private Date birthDate; 
private static final long serialVersionUID = 1L; 

}

Alors, quand je tente d'appeler addUser() dans UserController, j'ai NullPointerException pendant persistent.

Answer 1

Je pense que vous manquez la configuration de dire au printemps pour rechercher les annotations (ajouter ce qui suit partout entre l'élément <beans>:

<context:annotation-config /> 

Et peut-être vous devez également ajouter le spécifiant le package suivant où vous avez le DAO Mais je ne pense pas que cela est nécessaire

<context:component-scan base-package="your.package" /> 

Answer 2

ce travaille morceau de code:..

Spring.xml:

<?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: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.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-3.0.xsd"> 
     <context:annotation-config /> 
     <context:component-scan base-package="com.package.dao" /> 
     <tx:annotation-driven transaction-manager="transactionManager" /> 
     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> 
       <property name="persistenceUnitName" value="fcmsServer" /> 
     </bean> 
     <bean id="transactionManager" class="org.springframework.orm.jpa.JpaTransactionManager"> 
       <property name="entityManagerFactory" ref="entityManagerFactory" /> 
     </bean>   
</beans> 

haricot Dao:

@Repository 
public class UserDaoBean implements UserDao { 
     @PersistenceContext 
     protected EntityManager em;   
} 

persistence.xml:

<?xml version="1.0" encoding="UTF-8" ?> 
<persistence 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_1_0.xsd" 
      version="1.0"> 
    <persistence-unit name="fcmsServer" transaction-type="RESOURCE_LOCAL"> 

     <class>com.package.entity.</class> 
     <properties> 
      <property name="javax.persistence.jdbc.url" 
       value="jdbc:mysql://localhost:3306/db_name"/> 
      <property name="javax.persistence.jdbc.driver" value="com.mysql.jdbc.Driver"/> 
      <property name="javax.persistence.jdbc.user" value="admin"/> 
      <property name="javax.persistence.jdbc.password" value="admin"/> 
     </properties> 
    </persistence-unit> 
</persistence>