Could not read mappings from resource ?

[Ayub ali khan]

Hi All,

Please help me with the following problem

 
===============================================================
                  Employee.java
================================================================
 
public class Employee {

private String empName; 
private String password; 

public Employee(){}


/**
 * @return Returns the empName.
 */
public String getEmpName() {
return empName;
}
/**
 * @param empName The empName to set.
 */
public void setEmpName(String empName) {
this.empName = empName;
}
/**
 * @return Returns the password.
 */
public String getPassword() {
return password;
}
/**
 * @param password The password to set.
 */
public void setPassword(String password) {
this.password = password;
}
} 

============================================================================
                         HibernateUtil.java
===========================================================================
 
package com.ibm.util;
 
import org.hibernate.*;
import org.hibernate.cfg.*;
import com.ibm.hibernate_article.*;
 
public class HibernateUtil {
 
    private static final SessionFactory sessionFactory;
 
    static {
        try {
            // Create the SessionFactory from hibernate.cfg.xml
            //sessionFactory = new Configuration().configure().buildSessionFactory();
            sessionFactory = new Configuration().addClass(Employee.class).configure().buildSessionFactory(); 
        } catch (Throwable ex) {
            // Make sure you log the exception, as it might be swallowed
            System.err.println("Initial SessionFactory creation failed." + ex);
            throw new ExceptionInInitializerError(ex);
        }
    }
 
    public static SessionFactory getSessionFactory() {
        return sessionFactory;
    }
 
}

===============================================================
            EmpManager.java
================================================================
 
package com.ibm.hibernate_article;
import com.ibm.util.*;
import org.hibernate.Session;
 
 
/**
 * 
 *
 * TODO To change the template for this generated type comment go to
 * Window - Preferences - Java - Code Style - Code Templates
 */
public class EmpManager {
 
public static void main(String[] args) {

EmpManager mgr = new EmpManager();
 
        if (args[0].equals("store")) {
            mgr.createAndStoreEmp("hibernate","hibernate");
        }
 
        HibernateUtil.getSessionFactory().close();
}//end main
        private void createAndStoreEmp(String name,String pwd)
        {
        Session session = HibernateUtil.getSessionFactory().getCurrentSession();
 
            session.beginTransaction();
            Employee emp=new Employee();
            emp.setEmpName(name);
            emp.setPassword(pwd);
            session.save(emp);
            session.getTransaction().commit();
 
}
 

}

===============================================================
                  hibernate.cfg.xml in MyProj folder.
================================================================
 
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
        "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
        "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
 
<hibernate-configuration>
 
    <session-factory>
 
        <!-- Database connection settings -->
        <property name="connection.driver_class">com.ibm.db2.jcc.DB2Driver</property>
        <property name="connection.url">jdbc: D b2://ib016:50000/appdb</property>
        <property name="connection.username">KhanAy</property>
        <property name="connection.password">welcometoibm</property>
 
        <!-- JDBC connection pool (use the built-in) -->
        <property name="connection.pool_size">1</property>
 
        <!-- SQL dialect -->
        <property name="dialect">cirrus.hibernate.sql.DB2Dialect</property>
 
        <!-- Enable Hibernate's automatic session context management -->
        <property name="current_session_context_class">thread</property>
 
        <!-- Disable the second-level cache  -->
        <property name="cache.provider_class">org.hibernate.cache.NoCacheProvider</property>
 
        <!-- Echo all executed SQL to stdout -->
        <property name="show_sql">true</property>
 
        <!-- Drop and re-create the database schema on startup -->
        <property name="hbm2ddl.auto">create</property>
 
       
 
    </session-factory>
 
</hibernate-configuration>

=========================================================================
Employee.hbm.xml in package com.ibm.hibernate_article
======================================================================
 
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
   "-//Hibernate/Hibernate Mapping DTD//EN"
   "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
 
<hibernate-mapping package="com.ibm.hibernate_article">
    <class name="com.ibm.hibernate_article.Employee" table="employee">
       
 
<id name=" empName " column="EMPNAME"> 
 
<generator class="assigned"/> 
 
</id> 
 
 
 
<property name="empName"/>
        <property name="password"/>
    </class>
 
</hibernate-mapping>
<!-- parsed in 0ms -->

==================================================================
Following Error message when run using store as the initial argument.

============================================================

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Initial SessionFactory creation failed.org.hibernate.MappingException: Could not read mappings from resource: com/ibm/hibernate_article/Employee.hbm.xml
Exception in thread "main" java.lang.ExceptionInInitializerError
at com.ibm.util.HibernateUtil.<clinit>(HibernateUtil.java:31)
at com.ib.hibernate_article.EmpManager.createAndStoreEmp(EmpManager.java:32)
at com.ib.hibernate_article.EmpManager.main(EmpManager.java:25)
Caused by: org.hibernate.MappingException: Could not read mappings from resource: com/ibm/hibernate_article/Employee.hbm.xml
at org.hibernate.cfg.Configuration.addClass(Configuration.java:506)
at com.ib.util.HibernateUtil.<clinit>(HibernateUtil.java:27)
... 2 more
Caused by: org.hibernate.PropertyNotFoundException: field not found: empName
at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:97)
at org.hibernate.property.DirectPropertyAccessor.getField(DirectPropertyAccessor.java:104)
at org.hibernate.property.DirectPropertyAccessor.getGetter(DirectPropertyAccessor.java:112)
at org.hibernate.util.ReflectHelper.getter(ReflectHelper.java:89)
at org.hibernate.util.ReflectHelper.reflectedPropertyClass(ReflectHelper.java:77)
at org.hibernate.mapping.SimpleValue.setTypeUsingReflection(SimpleValue.java:276)
at org.hibernate.cfg.HbmBinder.bindSimpleId(HbmBinder.java:410)
at org.hibernate.cfg.HbmBinder.bindRootPersistentClassCommonValues(HbmBinder.java:343)
at org.hibernate.cfg.HbmBinder.bindRootClass(HbmBinder.java:282)
at org.hibernate.cfg.HbmBinder.bindRoot(HbmBinder.java:153)
at org.hibernate.cfg.Configuration.add(Configuration.java:386)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:427)
at org.hibernate.cfg.Configuration.addClass(Configuration.java:503)
... 3 more


Best Regards
Ayub

[ October 19, 2006: Message edited by: Ayub ali khan ]

[Editied to use code tags - Paul Sturrock]
[ October 25, 2006: Message edited by: Paul Sturrock ]

[pascal betz]

in case this is still a problem:
you have a space in the property name:

<id name=" empName " column="EMPNAME">

should be

<id name="empName " column="EMPNAME">

pascal

[FX Douxchamps]

Maybe you need to check the place you put the mapping file...

The package location must be the same than the java file...

[Mark Spritzler]

Plus, you can't have the same attribute be your id and a property at the same time.

I would keep EMPNAME as a property and not make it an ID, it is a really bad candidate for an ID, because you could have two Joe Smith's in your database and then you are in trouble. Always make your ids, as the following

1. a Long
2. named id
3. not a business field in your database, let the database use its native incrementor, whatever that is. This is called a surrogate key, and has no business meaning to it, like EMPNAME does.

Mark