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Hibenrate异常:Could not get constructor for org.hibernate.persister.entity.SingleT

程序员文章站 2022-04-12 20:59:40
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Hibernate异常:

Initial SessionFactory creation failed.org.hibernate.MappingException: Could not get constructor for org.hibernate.persister.entity.SingleTableEntityPersister

 

环境:hibernate-core版本4.2.17.Final

 

POJO类:User

 

package com.ssh.model;

public class User {
	private long id;
	private String name;
	private int age;
	private boolean isMan;
	private Group group;
	
	public long getId() {
		return id;
	}

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

	public String getName() {
		return name;
	}

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

	public int getAge() {
		return age;
	}

	public void setAge(int age) {
		this.age = age;
	}

	public boolean isMan() {
		return isMan;
	}

	public void setMan(boolean isMan) {
		this.isMan = isMan;
	}

	public Group getGroup() {
		return group;
	}

	public void setGroup(Group group) {
		this.group = group;
	}
	
}

 

 

HBM映射文件:

 

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
        "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
        "http://www.hibernate.org/dtd/hibernate-mapping-3.0.dtd">

<hibernate-mapping package="com.ssh.model">


	<class name="User" table="t_user">
		<id name="id" type="java.lang.Long" column="u_id">
			<!-- <generator class="sequence">
				<param name="sequence">user_id_seq</param>
			</generator> -->
			<generator class="native"></generator>
		</id>
		
		<property name="name" column="u_name"></property>
		<property name="age" column="u_age"></property>
		<property name="isMan" column="u_man" type="yes_no"></property>
		
		<many-to-one name="group" column="u_group"></many-to-one>
		
	</class>

</hibernate-mapping>

 

 

解释:

出现该异常是当hibernate解析hbm文件时,看到<property name="isMan" column="u_man" type="yes_no"></property>就找到对应的实体类User,去其中找setIsMan()方法,但是可惜没有。为什么没有呢?User类中有isMan属性啊,但是在通过eclipse为我们生成getter和setter时,eclipse发现是is开始的属性生成setter方法时主动去掉了is,生成getter方法时却没有用get开头,最终变成如下结果:

public boolean isMan() {
	return isMan;
}

public void setMan(boolean isMan) {
	this.isMan = isMan;
}

所以当hibernate想找setIsMan方法时就找不到了。

解决方法1:修改hbm中的property标签的name属性为man(setMan的Man部分)

解决方法2:修改POJO类的setter方法为setIsMan

 

通过该异常我们得出结论:

POJO类的属性尽量不要使用is开头,如果使用is开头,那么就手动编写getter和setter方法,以防出现该异常。

 

 

相关标签: hibernate异常