Hibernate: Unable to load class declared in Hibernate configuration <mapping/> entry

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I am completely new in Hibernate and got such an stacktrace:

hql> from TracksEntity 
[2014-04-26 21:13:45] org.hibernate.MappingException: Unable to load class [ model.TracksEntity] declared in Hibernate configuration <mapping/> entry
[2014-04-26 21:13:45] java.lang.ClassNotFoundException: model.TracksEntity
    at java.net.URLClassLoader$1.run(URLClassLoader.java:372)
    at java.net.URLClassLoader$1.run(URLClassLoader.java:361)
    at java.security.AccessController.doPrivileged(Native Method)
    at java.net.URLClassLoader.findClass(URLClassLoader.java:360)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
    at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308)
    at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
    at java.lang.Class.forName0(Native Method)
    at java.lang.Class.forName(Class.java:259)
    at org.hibernate.internal.util.ReflectHelper.classForName(ReflectHelper.java:192)
    at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:2188)
    at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:2139)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2119)
    at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:2072)
    at org.hibernate.cfg.Configuration.configure(Configuration.java:2045)
    at com.intellij.hibernate.remote.impl.RemoteConfigurationImpl.configure(RemoteConfigurationImpl.java:57)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
    at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
    at java.lang.reflect.Method.invoke(Method.java:483)
    at sun.rmi.server.UnicastServerRef.dispatch(UnicastServerRef.java:323)
    at sun.rmi.transport.Transport$1.run(Transport.java:178)
    at sun.rmi.transport.Transport$1.run(Transport.java:175)
    at java.security.AccessController.doPrivileged(Native Method)
    at sun.rmi.transport.Transport.serviceCall(Transport.java:174)
    at sun.rmi.transport.tcp.TCPTransport.handleMessages(TCPTransport.java:557)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run0(TCPTransport.java:812)
    at sun.rmi.transport.tcp.TCPTransport$ConnectionHandler.run(TCPTransport.java:671)
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
    at java.lang.Thread.run(Thread.java:744)

My hibernate.cfg.xml and TracksEntity.java was automatically generated by Intellij Idea:

TracksEntity.java: package model;

import javax.persistence.*;

@Entity
@Table(name = "TRACKS", schema = "APP", catalog = "")
public class TracksEntity {
    private int id;
    private String artist;
    private int duration;
    private String title;
    private String url;

    @Id
    @Column(name = "ID")
    public int getId () {
        return id;
    }

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

    @Basic
    @Column(name = "ARTIST")
    public String getArtist () {
        return artist;
    }

    public void setArtist (String artist) {
        this.artist = artist;
    }

    @Basic
    @Column(name = "DURATION")
    public int getDuration () {
        return duration;
    }

    public void setDuration (int duration) {
        this.duration = duration;
    }

    @Basic
    @Column(name = "TITLE")
    public String getTitle () {
        return title;
    }

    public void setTitle (String title) {
        this.title = title;
    }

    @Basic
    @Column(name = "URL")
    public String getUrl () {
        return url;
    }

    public void setUrl (String url) {
        this.url = url;
    }

    @Override
    public boolean equals (Object o) {
        if (this == o) return true;
        if (o == null || getClass() != o.getClass()) return false;

        TracksEntity that = (TracksEntity) o;

        if (duration != that.duration) return false;
        if (id != that.id) return false;
        if (artist != null ? !artist.equals(that.artist) : that.artist != null) return false;
        if (title != null ? !title.equals(that.title) : that.title != null) return false;
        if (url != null ? !url.equals(that.url) : that.url != null) return false;

        return true;
    }

    @Override
    public int hashCode () {
        int result = id;
        result = 31 * result + (artist != null ? artist.hashCode() : 0);
        result = 31 * result + duration;
        result = 31 * result + (title != null ? title.hashCode() : 0);
        result = 31 * result + (url != null ? url.hashCode() : 0);
        return result;
    }
}

hibernate.cfg.xml:

<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
    "-//Hibernate/Hibernate Configuration DTD//EN"
    "http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
    <session-factory>
        <property name="connection.url">jdbc:derby:/home/zimy/Documents/drbdb;create=true;create=true</property>
        <property name="connection.driver_class">org.apache.derby.jdbc.EmbeddedDriver</property>
        <mapping class="model.TracksEntity"/>
    </session-factory>
</hibernate-configuration>

What the problem is? I see that it is not found, but why?

Sounds quite silly but i was putting my entity Class in a package which is not the same i put in the mapping.. and hibernate of course could not find it... just for reference.. maybe a recheck can solve your problem best regards.

Hibernate-Unable To Load Class Declared In Hibernate Configuration, MappingException: Unable to load class [ src/main/java/com.hibernate.data/ Person] declared in Hibernate configuration <mapping/> entry I am completely new in Hibernate and got such an stacktrace: hql> from TracksEntity [2014-04-26 21:13:45] org.hibernate.MappingException: Unable to load class [ model.TracksEntity] declared in

write in this pattern

 <session-factory>

    <property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
    <property name="hibernate.connection.url">jdbc:mysql://localhost:3306/dairy
    </property>
    <property name="hibernate.connection.username">root</property>
    <property name="hibernate.connection.password">root</property>
    <property name="hibernate.connection.pool_size">10</property>
    <property name="show_sql">true</property>
    <property name="dialect">org.hibernate.dialect.MySQLDialect</property>
    <property name="hibernate.current_session_context_class">thread</property>

    <!-- MAPPING -->
    <!-- <mapping class="com.om.model.Test" /> -->
    <mapping class="com.om.model.RateCalculationBean" />

</session-factory>

and also no need to mention scema

Need help with Unable to load class issue, hibernate.MappingException: Unable to load class declared as <mapping class= "com.project.dblayer.Project"/> in the configuration: .. Hibernate Exception – Unable to load class com.mysql.jdbc.Driver. If you are using MySQL database for your hibernate application, then you have to add the MYSQL driver library in your classpath for accessing the database. If you fail to do that, you will end up in the following exception.

I had a similar problem when the mapping file wouldn´t load correctly. The answer to this problem seems to be that we need to use the correct import statements in our Model classes.

Changing the import to import javax.persistence.Entity instead of using the one from hibernate package ( ie org.hibernate.annotations.Entity), fixed the issue in my case.

This issue is a real pain , and I spent more than 1/2 day looking at all corners, when a simple import fixed the issue.

Hope this helps.

Exception in thread "main" org.hibernate.mappingexception: unable , org.hibernate.mappingexception: unable to load class declared as Configuration(); //hibernate class to locate and refer the configuration� My packagename = _05_one2one Exception in thread "main" org.hibernate.MappingException: Unable to load class [ _05_one2one.*] declared in Hibernate configuration <mapping/> entry Caused by: java.lang.ClassNotFoundException: _05_one2one.* – user3174737 Sep 29 '15 at 6:10

Worked for me:

Changing position of mapping tag in hibernate.cfg.xml for class which was not loading previously.

I kept that at top now.

[hibernate-dev] Failed to load Class, Unable to load class [ org.praveen.dto.UserDetais] declared in Hibernate configuration <mapping/> entry at org.hibernate.cfg.Configuration. Hibernate with MySQL Database. MySQL is one of the most popular open-source database systems available today. Let us create hibernate.cfg.xml configuration file and place it in the root of your application's classpath.

i recently experienced this. I checked everything and didn't find anything that might have caused it. In desperation, i just moved the "/>" closer in the mapping and saved it. And it worked. Mysterious...

Hibernate-Unable to load class declared in Hibernate configuration , MappingException: Unable to load class [ src/main/java/http://ift.tt/1OqQrk4] declared in Hibernate configuration <mapping/> entry Hibernate Dialect: As we know, Hibernate is database-agnostic framework, at some point, hibernate needs to use database specific, extended or native SQL, so hibernate uses dialect configuration to know which database you’re using so that it can switch to the database specific SQL generator code. If you’ve omitted this entry, hibernate would

Unable to load class declared in Hibernate configuration , MappingException: Unable to load class [ model.TracksEntity] declared in Hibernate configuration <mapping/> entry [2014-04-26 21:13:45]� Used bundled derby sample database Create hibernate reverse engineering xml file with only one PRODUCT_CODE table Invoke Hibernate Mappring wizard to create POJO file. (I used it with ОВЛ5 Features and EJB annotations and no XML mappings) Click Finish to see ProductCode,java file is created.

org.hibernate.MappingException: Unable to load class [ models , org.hibernate.MappingException: Unable to load class [ models.Question] declared in Hibernate configuration <mapping/> entry java.lang. CodeProject, 503-250 Ferrand Drive Toronto Ontario, M3C 3G8 Canada +1 416-849-8900 x 100

Hibernate - Quick Guide, Hibernate takes care of mapping Java classes to database tables using XML files and The Configuration object is the first Hibernate object you create in any All attributes that will be persisted should be declared private and have You will use FROM clause if you want to load a complete persistent objects into memory. After configuring hibernate in eclipse,we need to configure “hibernate.cfg.xml” for database configuration and other related parameters.By default,hibernate searches for a configuration file in a project’s root directory.Create a file named “hibernate.cfg.xml” in src folder.

Comments
  • Thank you! adding <property name="hibernate.current_session_context_class">thread</property> to hibernate.cfg.xml make it works. But what that means? Why I got java.lang.ClassNotFoundException: model.TracksEntity when I had no such property configured?