no persistent classes found for query class: FROM com.vrv.paw.domain.User

在整合Spring+Hibernate时报该错误，sessionFactory配置如下：

    <bean id="sessionFactory" class="org.springframework.orm.hibernate4.LocalSessionFactoryBean">
　　　　.......
        <!-- 自动扫描注解方式配置的hibernate类文件 -->
        <property name="packagesToScan">  //最后发现是该处的错误
            <list>
                <value>sys.model</value>
            </list>
        </property>
　　　　.......
    </bean>

正如上面XML配置的那样，packageToScan是配置以注解方式配置Hibernate类，即如下这样的方式：

package sys.model;

import java.io.Serializable;
import java.util.Date;

import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;
import javax.persistence.Temporal;
import javax.persistence.TemporalType;

@Entity
@Table(name = "User")
public class UserInfo implements Serializable {
    private static final long serialVersionUID = 8427996478439081619L;
    // Fields
    private String id;
    private String name;
    private String pwd;
    private Date createdatetime;
    private Date modifydatetime;
    /** full constructor */
    public UserInfo(String id, String name, String pwd, Date createdatetime, Date modifydatetime) {
        this.id = id;
        this.name = name;
        this.pwd = pwd;
        this.createdatetime = createdatetime;
        this.modifydatetime = modifydatetime;
    }

    @Id
    @Column(name = "ID", unique = true, nullable = false, length = 36)
    public String getId() {
        return this.id;
    }

    public void setId(String id) {
        this.id = id;
    }

    @Column(name = "NAME", unique = true, nullable = false, length = 100)
    public String getName() {
        return this.name;
    }

    public void setName(String name) {
        this.name = name;
    }

    @Column(name = "PWD", nullable = false, length = 32)
    public String getPwd() {
        return this.pwd;
    }

    public void setPwd(String pwd) {
        this.pwd = pwd;
    }

    @Temporal(TemporalType.TIMESTAMP)
    // 如果这里是这种TemporalType.DATE，那么时间在数据库中存的时候会是"2015-07-16 00:00:00"这种形式，时分秒都为零
    @Column(name = "CREATEDATETIME", length = 7)
    public Date getCreatedatetime() {
        return this.createdatetime;
    }

    public void setCreatedatetime(Date createdatetime) {
        this.createdatetime = createdatetime;
    }

    @Temporal(TemporalType.TIMESTAMP)
    @Column(name = "MODIFYDATETIME", length = 7)
    public Date getModifydatetime() {
        return this.modifydatetime;
    }

    public void setModifydatetime(Date modifydatetime) {
        this.modifydatetime = modifydatetime;
    }

    @Override
    public String toString() {
        return "[ID:" + id + " Name:" + name + " PassWord:" + pwd + " Createdatetime:" + createdatetime + " Modifydatetiem:" + modifydatetime + "]";
    }
}

但是我整合式采用的*.hbm.xml的方式

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RcwbxjgMgud4kzlJaglNyYdwwK2eUuRYZSEI5kpiWYdwwI2eX2P0M55wkl5h2DQna5MUMJGNnlxgwlYGSXGzOUgJFdbgQwKDcCFpQbAQvKjYAF5UbAgnIjYJFdbsxQAkZ2uaO3DiXmFXxDdrmLzVA6FLSuBFkoKLdvyC53sRlKlLsMkF3uYjOUKHcZILvcxWYoveT2XjiEbsWuLkntGWOUfiC73MVmKN3lFq866cxNcqtL0o0xRukPsstdbIbS48jNBbrccpNuMw1MmvmG7HL7kaEkhIijwS6rTrrsQbAjlHtByC53sRlKNtjIJrmEq07yuUnOV4xRlgDZ5S42Q0kIO93gf7uEO58UnGPOW26MUc4X2eXGDCVgZJcbM5SAkV1uzFACRna5EcCg3AhY/g+fwimj+8WqCQAAAABJRU5ErkJggg==" alt="" />

这种方式最方便的方式是采用“mappingDirectoryLocations”

    <bean id="sessionFactory" class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">
　　　　.......
        <property name="mappingDirectoryLocations">
            <list>
                <value>classpath:com/vrv/paw/domain</value>
            </list>
        </property>
   </bean>

扩展：

mappingResources、mappingLocations、mappingDirectoryLocations
他们的区别：   
1. mappingResources：指定classpath下具体映射文件名

<property name="mappingResources">
    <value>petclinic.hbm.xml </value>
</property>   

2. mappingLocations：可以指定任何文件路径，并且可以指定前缀：classpath、file等

<property name="mappingLocations">
    <value>/WEB-INF/petclinic.hbm.xml </value>
</property>  

<property name="mappingLocations">
    <value>classpath:/com/company/domain/petclinic.hbm.xml </value>
</property>   

也可以用通配符指定，'*'指定一个文件(路径)名，'**'指定多个文件(路径)名，例如：

<property name="mappingLocations">
    <value>classpath:/com/company/domainmaps/*.hbm.xml </value>
</property>   

上面的配置是在com/company/domain包下任何maps路径下的hbm.xml文件都被加载为映射文件   
 
3. mappingDirectoryLocations：指定映射的文件路径

<property name="mappingDirectoryLocations">  <list>
  <value>WEB-INF/HibernateMappings</value>
  </list>
</property>   

也可以通过classpath来指出

<property name="mappingDirectoryLocations">
  <list>
  <value>classpath:/XXX/package/</value>
  </list>
</property>  

总结:注解方式配置的hibernate类 与  *.hbm.xml  方式配置的类，在配置SessionFactory时配置方式是不同的，这是我以前没有注意的