未能找到类- Spring 3、Hibernate 3、JPA

Question

看来，JPA底层结构没有找到我的类。我猜春天就是找不到吗？我尝试过包扫描并将类添加到persistence.xml中。有谁对我还能尝试让我的选择找到那个类(和底层表)有任何想法？谢谢!

这是密码。

persistence.xml

<persistence-unit name="myApp" transaction-type="RESOURCE_LOCAL">
  <provider>org.hibernate.ejb.HibernatePersistence</provider>
  <jta-data-source>java:joss/datasources/myDB</jta-data-source>
  <!-- get a special error with this in - see below -->
  <!-- <class>com.src.dao.User</class> -->

  <exclude-unlisted-classes>false</exclude-unlisted-classes>
  <properties>
     <property name="hibernate.archive.autodetection" value="class,hbm" />

导致错误的UserDAO代码：

final String queryString="select model from " +User.class.getSimpleName() + " model where model."propertyName+"=:propertyValue";
return getJpaTemplate().executeFind(new JpaCallback() {
   @Override
   public Object doInJpa(EntityManager em) throws PersistenceException {
      //this line causes the error below
      Query query = em.createQuery(queryString);

引发的错误：

 201-06-10 18:59:32,736 ERROR [UserDAO] find by property name failed
org.springframework.dao.InvalidDataAccessApiUsageException: org.hibernate.hql.internal.ast.QuerySyntaxException: User is not mapped [select model from User model where model.value= :propertyValue]; nested exception is java.lang.IllegalArgumentException: org.hibernate.hql.internal.ast.QuerySyntaxException:User is not mapped [select model from User model where model.value= :propertyValue]
   at org.springframework.orm.jpa.EntityManagerFactoryUtils.convertJpaAccessExceptionIfPossible(EntityManagerFactoryUtils.java:286)

applicationcontext.xml

<context:annotation-config />
<context:component-scan base-package="com.src.dao" />

在豆子里也试过

<beans:bean id="entityManagerFactory" class="org.springframework.orm.jpa.LocalEntityManagerFactoryBean" packagesToScan="com.src.dao">
   <beans:property name="persistenceUnitName" value="myApp" />
   <beans:property name="packagesToScan" value="com.src.dao" />
</beans:bean>

用户类别：

package com.src.dao

import javax.persistence.Entity;
import javax.persistence.Table;
import javax.persistence.Transient;

/**
* User Entity
*
* @author MyEclipse Persistence Tools
*/
@Entity
@Table (name="USERS", schema="myDb")
public class User extends AbstractUser implements java.io.Serializable, Comparable<User> {

向persistence.xml添加类：

When I add in <class> to my persistence.xml I get the following on app deploy. The war never deploys:

Error creating bean with name 'entityManagerFactory' defined in ServletContext resource [/WEB-INF/configs/spring/stu-hibernate.xml]: Invocation of init method failed; nested exception is javax.persistence.PersistenceException: [PersistenceUnit: myApp] Unable to build EntityManagerFactory
   at org.springframework.beans.factory.annotation.AutoWiredAnnotationBeanPostProcessor.postProcessPropertyValues(AutowiredAnnotationBeanPostProcessor.java:285)

Answer 1

终于弄明白了。看来，基于我的Spring (3.0.5)，我确实需要在persistence.xml中添加类。但是，我的上述错误不允许这样做。结果发现..。我需要将包中的所有类添加到persistence.xml (减去DAO的)。一旦我这样做，应用程序启动和工作！不知道为什么他们都需要。