如何在由Hibernate生成的DAO中插入@PersistenceContext 3-maven-plugin

Question

我想创建一个基于的Java应用程序Hibernate-3和Spring Framework。为了简化流程，我发现hibernate3-maven-plugin能够对现有数据库执行反向工程。
这里有例如POM的：

<plugin> 
    <groupId>org.codehaus.mojo</groupId> 
    <artifactId>hibernate3-maven-plugin</artifactId> 
    <version>2.2</version> 
    <configuration> 
     <components> 
      <component> 
       <name>hbm2java</name> 
       <outputDirectory>src/main/java</outputDirectory> 
       <implementation>jdbcconfiguration</implementation> 
      </component> 
      <component> 
       <name>hbm2dao</name> 
       <outputDirectory>src/main/java</outputDirectory> 
       <implementation>jdbcconfiguration</implementation> 
      </component> 
     </components> 
     <componentProperties> 
      <revengfile>/src/main/resources/model.reveng.xml</revengfile> 
      <propertyfile>/src/main/resources/hibernate.properties</propertyfile> 
      <jdk5>true</jdk5> 
      <ejb3>true</ejb3> 
     </componentProperties> 
    </configuration> 
    <dependencies> 
     <dependency> 
      <groupId>mysql</groupId> 
      <artifactId>mysql-connector-java</artifactId> 
      <version>5.1.18</version> 
     </dependency> 
     <dependency> 
      <groupId>cglib</groupId> 
      <artifactId>cglib-nodep</artifactId> 
      <version>2.1_3</version> 
     </dependency> 
    </dependencies> 
    <executions> 
     <execution> 
      <phase>compile</phase> 
      <goals> 
       <goal>hbm2java</goal> 
       <goal>hbm2dao</goal> 
      </goals> 
     </execution> 
    </executions> 
</plugin> 

然后，我建立在Spring上下文：

<?xml version="1.0" encoding="UTF-8"?> 
    <beans xmlns="http://www.springframework.org/schema/beans" 
      xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
      xsi:schemaLocation="http://www.springframework.org/schema/beans 
      http://www.springframework.org/schema/beans/spring-beans-2.0.xsd"> 

     <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> 
      <property name="persistenceUnitName" value="gomer" /> 
     </bean> 

     <bean id="entityManager" factory-bean="entityManagerFactory" factory-method="createEntityManager"/> 

     <bean id="user" class="ru.tomtrix.first.db.UserHome"> 
      <property name="entityManager" ref="entityManager"/> 
     </bean> 
    </beans> 

它完美地生成一个实体文件，除了以下一个DAO文件。在DAO文件中有一个EntityManager：

@Stateless 
public class UserHome { 

    private static final Log log = LogFactory.getLog(UserHome.class); 

    @PersistenceContext private EntityManager entityManager; 

...并且该字段没有setter！最终Spring抛出异常：

Invalid property 'entityManager' of bean class [ru.tomtrix.first.db.UserHome]: Bean property 'entityManager' is not writable or has an invalid setter method. Does the parameter type of the setter match the return type of the getter? 

当然，手动编写setter并不是一个好习惯。我认为有一种方法可以正确地注入经理。 那么如何做到这一点，而不重写生成的文件？

通讯信息：
1）我想创建一个独立的应用程序（也可能是如Tomcat应用服务器运行）
2）model.reveng.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<!DOCTYPE hibernate-reverse-engineering SYSTEM "http://www.hibernate.org/dtd/hibernate-reverse-engineering-3.0.dtd"> 
<hibernate-reverse-engineering> 
    <table-filter match-name=".*" package="ru.tomtrix.first.db"/> 
</hibernate-reverse-engineering> 

3）persistence.xml：

<?xml version="1.0" encoding="UTF-8"?> 
<persistence version="1.0" 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_1_0.xsd"> 

    <persistence-unit name="gomer" transaction-type="RESOURCE_LOCAL"> 
     <provider>org.hibernate.jpa.HibernatePersistenceProvider</provider> 
     <class>User</class> 
     <properties> 
      <property name="hibernate.dialect" value="org.hibernate.dialect.MySQL5Dialect"/> 
      <property name="hibernate.connection.driver_class" value="com.mysql.jdbc.Driver"/> 
      <property name="hibernate.show_sql" value="true"/> 
      <property name="hibernate.connection.username" value="root"/> 
      <property name="hibernate.connection.password" value="1234"/> 
      <property name="hibernate.connection.url" value="jdbc:mysql://localhost:3306/users"/> 
     </properties> 
    </persistence-unit> 
</persistence> 

Answer 1

问题是您缺少一部分配置。你需要告诉Spring你想（也）使用注解来进行配置。为此，将<context:annotation-config />添加到您的配置中，并删除entityManager

的设置旁边的那个删除工厂方法的调用spring将处理所有为你。

添加提示使用的

<?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" 
     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"> 

    <context:annotation-config /> 

    <bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean"> 
     <property name="persistenceUnitName" value="gomer" /> 
    </bean> 

    <bean id="user" class="ru.tomtrix.first.db.UserHome" /> 

</beans> 

你的代码的版本少架构INSEAD可能是有问题的，当你把它部署到茂盛的应用服务器，你可能会遇到的问题与Spring和EJB容器在控制竞争的豆子。休眠插件生成@Stateless会话bean，通常会被应用程序拾取。服务器（取决于你使用哪一个）。