org.hibernate.MappingException：未知实体：在spring orm中 [英] org.hibernate.MappingException: Unknown entity: in spring orm

问题描述

我收到以下异常：

org.hibernate.MappingException：未知实体：com.sample.Student

我在Stackoverflow上看到了很多同样问题的答案，但是他们都建议使用来自javax.persistence的@Entity批注而不是hibernate，在我的例子中

我的POJO课程

我只是从javax.persistence中使用它，  package com.sample; 
 
 import javax.persistence.Entity; 
 import javax.persistence.Id; 
 import javax.persistence.Table; 
 
 @Entity 
 @Table 
 public class Student {
 
 @Id 
 int id; 
 
 public int getId（）{
 return id; 
} 
 
 public void setId（int id）{
 this.id = id; 
} 
 
字符串firstName; 
字符串姓氏; 
 
 public String getFirstName（）{
 return firstName; 
} 
 
 public void setFirstName（String firstName）{
 this.firstName = firstName; 
} 
 
 public String getLastName（）{
 return lastName; 
} 
 
 public void setLastName（String lastName）{
 this.lastName = lastName; 
 
 
 $ / code $ / pre 
 
 和我的Manger class  
 
 
  package com.sample; 
 
 import java.util.Properties; 
 
 import org.hibernate.SessionFactory; 
 import org.springframework.jdbc.datasource.DriverManagerDataSource; 
 import org.springframework.orm.hibernate3.HibernateTemplate; 
 import org.springframework.orm.hibernate3.LocalSessionFactoryBean; 
 
 public class ORMManager {
 
 / ** 
 * @param args 
 * / 
 public static void main（String [] args ）{
 DriverManagerDataSource ds = new DriverManagerDataSource（）; 
 ds.setUrl（jdbc：oracle：thin：@localhost：1521：XE）; 
 ds.setDriverClassName（oracle.jdbc.driver.OracleDriver）; 
 ds.setUsername（system）; 
 ds.setPassword（tiger）; 
 
 LocalSessionFactoryBean lsfb = new LocalSessionFactoryBean（）; 
 lsfb.setDataSource（ds）; 
 HibernateTemplate template = new HibernateTemplate（）; 
属性prop = new Properties（）; 
 prop.put（hibernate.dialect，org.hibernate.dialect.OracleDialect）; 
 prop.put（hibernate.show_sql，true）; 
 prop.put（hbm2ddl.auto，create）; 
 
 lsfb.setHibernateProperties（prop）; 
尝试{
 lsfb.afterPropertiesSet（）; 
} catch（Exception e）{
 
 e.printStackTrace（）; 
} 
 template.setSessionFactory（（SessionFactory）lsfb.getObject（））; 
 template.afterPropertiesSet（）; 
 
学生s =新生Student（）; 
 s.setFirstName（pallavi）; 
 s.setLastName（sing）; 
 template.save（s）; 
 System.out.println（done）; 
 
 
 
 
 $ b  
请帮我解决这个问题
解决方案
您正在尝试混合两件事 
 
 
 
 
注解 
 
和
 
 
 LocalSessionFactoryBean  
 
使用LocalSessionFactoryBean的子类 
 
 
 
 
 AnnotationSessionFactoryBean  
 
取代此
 
 
 LocalSessionFactoryBean lsfb = new LocalSessionFactoryBean（）; 
 
 with 
  AnnotationSessionFactoryBean lsfb = new AnnotationSessionFactoryBean（）; 
 Class [] annotatedClasses = {Student.class}; 
 lsfb.setAnnotatedClasses（annotatedClasses）; 
  
或
  AnnotationSessionFactoryBean lsfb = new AnnotationSessionFactoryBean（）; 
 annotationSessionFactoryBean.setPackagesToScan（new String [] {com.sample}）; 
  
看到这个 answer  
 
I am getting following exception 

  
org.hibernate.MappingException: Unknown entity: com.sample.Student
I have seen so many answers to same question on Stackoverflow but all of them suggests to use @Entity annotation from javax.persistence instead of hibernate, in my case I am using it from javax.persistence only but still getting this exception.

my POJO class 
package com.sample;

import javax.persistence.Entity;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table
public class Student {

    @Id
    int id;

    public int getId() {
        return id;
    }

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

    String firstName;
    String lastName;

    public String getFirstName() {
        return firstName;
    }

    public void setFirstName(String firstName) {
        this.firstName = firstName;
    }

    public String getLastName() {
        return lastName;
    }

    public void setLastName(String lastName) {
        this.lastName = lastName;
    }
}
and my Manger class
   package com.sample;

import java.util.Properties;

import org.hibernate.SessionFactory;
import org.springframework.jdbc.datasource.DriverManagerDataSource;
import org.springframework.orm.hibernate3.HibernateTemplate;
import org.springframework.orm.hibernate3.LocalSessionFactoryBean;

public class ORMManager {

    /**
     * @param args
     */
    public static void main(String[] args) {
    DriverManagerDataSource ds = new DriverManagerDataSource();
    ds.setUrl("jdbc:oracle:thin:@localhost:1521:XE");
    ds.setDriverClassName("oracle.jdbc.driver.OracleDriver");
    ds.setUsername("system");
    ds.setPassword("tiger");

    LocalSessionFactoryBean lsfb = new LocalSessionFactoryBean();
    lsfb.setDataSource(ds);
    HibernateTemplate template = new HibernateTemplate();
    Properties prop = new Properties();
    prop.put("hibernate.dialect", "org.hibernate.dialect.OracleDialect");
    prop.put("hibernate.show_sql", "true");
    prop.put("hbm2ddl.auto", "create");

    lsfb.setHibernateProperties(prop);
    try {
        lsfb.afterPropertiesSet();
    } catch (Exception e) {

        e.printStackTrace();
    }
    template.setSessionFactory((SessionFactory)lsfb.getObject());
    template.afterPropertiesSet();

    Student s = new Student();
    s.setFirstName("pallavi");
    s.setLastName("sing");
    template.save(s);
    System.out.println("done");


    }

}
please help me resolve this issue
解决方案
You are trying to mix two things 

  
Annotations
and 

  
LocalSessionFactoryBean
use the child class of LocalSessionFactoryBean that is 

  
AnnotationSessionFactoryBean
replace this 

  
LocalSessionFactoryBean lsfb = new LocalSessionFactoryBean();
with  
  AnnotationSessionFactoryBean lsfb = new AnnotationSessionFactoryBean();
  Class [] annotatedClasses =  {Student.class};
  lsfb.setAnnotatedClasses(annotatedClasses);
or
  AnnotationSessionFactoryBean lsfb = new AnnotationSessionFactoryBean();    
  annotationSessionFactoryBean.setPackagesToScan(new String[]{"com.sample"});
see this answer

                        
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