Getting org.hibernate.DuplicateMappingException: duplicate class / entity mapping in hibernate3.0

I am trying to run a webapp using hibernate3.0

with struts2-core-2.1.6

on Tomcat7.0.55

using JDK8

. I receive org.hibernate.DuplicateMappingException: Duplicate class/entity mapping com.poste.struts2.bean.CityDetails

. My hibernate.cfg.xml

:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
  "-//Hibernate/Hibernate Configuration DTD//EN"
  "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
     <session-factory>     
        <property name="connection.useUnicode">true</property> 
        <property name="connection.characterEncoding">UTF-8</property>
        <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
        <property name="connection.url">jdbc:mysql://localhost:3306/mydb</property>
        <property name="connection.username">uname</property>
        <property name="connection.password">pass</property>
        <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
        <property name="current_session_context_class">thread</property>
        <property name="hibernate.transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>     
        <property name="hibernate.show_sql">true</property> 
        <property name="format_sql">true</property> 
        <property name="hibernate.use_sql_comments">true</property>         
        <mapping class="com.poste.struts2.bean.CityDetails" />
        </session-factory>
</hibernate-configuration>

      

Class code:

package com.poste.struts2.bean;
import java.io.Serializable;
import javax.persistence.Column;
import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.Id;
import javax.persistence.Table;
import org.hibernate.annotations.GenericGenerator;
@Entity
@Table(name = "city_master")
public class CityDetails implements Serializable {
    private static final long serialVersionUID = 9149826260758390091L;
    private Long cityId;
    private String cityName;
    private String cityStatus;
    @Id
    @GenericGenerator(name="generator", strategy="increment")
    @GeneratedValue(generator="generator")
    @Column(name = "CITM_CITY_ID")
    public Long getCityId(){
        return this.cityId;
    }
    public void setCityId(Long cityId){
        this.cityId = cityId;
    }
    @Column(name = "CITM_CITY_NAME", columnDefinition = "nvarchar", length = 100)
    public String getCityName(){
        return this.cityName;
    }
    public void setCityName(String cityName){
        this.cityName = cityName;
    }
    @Column(name = "CITM_STATUS")
    public String getCityStatus() {
        return cityStatus;
    }
    public void setCityStatus(String cityStatus) {
        this.cityStatus = cityStatus;
    }
}

      

My WEB-INF / lib contains

activation-1.1.jar
antlr-2.7.6.jar
commons-beanutils.jar
commons-collections-3.1.jar
commons-fileupload-1.2.1.jar
commons-io-1.3.2.jar
commons-lang-2.3.jar
commons-logging-1.0.4.jar
dom4j-1.6.1.jar
ejb3-persistence.jar
freemarker-2.3.16.jar
hibernate-annotations.jar
hibernate-commons-annotations.jar
hibernate-validator.jar
hibernate3.jar
hsqldb.jar
httpclient-4.0.jar
itext-2.1.7.jar
java-mail-1.4.4.jar
JavaBridge.jar
javassist.jar
javax.persistence.jar
jcommon-1.0.16.jar
jfreechart-1.0.13.jar
json.jar
jta-1.1.jar
junit-3.8.1.jar
log4j-1.2.14.jar
mysql-connector-java-5.1.32.jar
ognl-2.6.11.jar
php-servlet.jar
poi-3.2-FINAL-20081019.jar
slf4j-api-1.5.8.jar
slf4j-log4j12-1.5.8.jar
slf4j-simple-1.5.8.jar
struts2-convention-plugin-2.1.6.jar
struts2-core-2.1.6.jar
struts2-dojo-plugin-2.2.3.jar
struts2-fullhibernatecore-plugin-1.4-GA.jar
struts2tutorial.jar
xwork-2.1.2.jar

      

COLUMNS:

CITM_CITY_ID    decimal(10,0)
CITM_CITY_NAME  varchar(200 
CITM_STATUS     varchar(20) 

      

Any idea? Thanks to

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6 answers


The problem is that you have a mapping for com.poste.struts2.bean.CityDetails

in your hibernate config file and also for annotation mapping in it.

Either remove the following line from hibernate.cfg.xml



 <mapping class="com.poste.struts2.bean.CityDetails" />

      

or remove annotations in the class CityDetails

.

+10


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Such a duplicate can also be caused by renaming the mapped class and creating the application without destroying the old classes (for example, creating with Maven without running "mvn clean").



+7


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This is a very correct answer by Darshan , but this error can occur even if you mention the same class mapping by mistake. I got this error when I mentioned

<bean id="sessionFactory"
        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean"
        p:dataSource-ref="writeDataSource"
        p:mappingResources="com/my/test/Test1.hbm.xml,com/my/test/Test2.hbm.xml,com/my/test/Test1.hbm.xml" />

      


as in the above mapping, I added Test1.hbm.xml again instead of Test3.hbm.xml

+2


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I had a problem and it caused some of the jars to be duplicated and I had to delete them and then clean up Jenkins (use the build tool I am using). Don't know the reason for these duplicated cans.

0


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There are no two different hibernate mapping files that need to have the same properties or ID tags.

0


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Maybe you just need to clean up your project and rebuild to fix the problem, as I am myself

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