Org.hibernate.MappingException: invalid configuration in hibernate

Question

hi,
i am new to hibernate.
while i am executing small program, below error occur.
what can i do to solve this problem, plz help me.
Error Code
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception occur:invalid configuration
org.hibernate.MappingException: invalid configuration+
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1493)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1420)
at FirstExample.main(FirstExample.java:12)
Caused by: org.xml.sax.SAXParseException: Document is invalid: no grammar found.
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanStartElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl$NSContentDispatcher.scanRootElementHook(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1490)
... 3 more
Exception in thread "main" java.lang.NullPointerException
at FirstExample.main(FirstExample.java:26)

Answer 1

Thank u .
I did all configuration properly by some guideline.
But i got new error in my program.
please reply me.
This is my program
*{color:#3366ff}Test.java{color}*
import org.hibernate.HibernateException;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.cfg.Configuration;
import event.Sample;
public class Test {
public static void main(String a[])throws HibernateException
Session session=null;
try
SessionFactory sessionFactory=new Configuration().configure().buildSessionFactory();
session=sessionFactory.openSession();
System.out.println("Insert record ");
Sample s=new Sample();
s.setId(3);
s.setName("Sundar");
session.save(s);
System.out.println("Sucessfully Saved");
}catch(Exception e)
System.out.println("Exception occur:"+e.getMessage());
e.printStackTrace();
}finally
session.flush();
session.close();
*{color:#3366ff}Java Bean Sample.java{color}*
package event;
public class Sample {
private int id;
private String name;
public int getId() {
return id;
public void setId(int id) {
this.id = id;
public String getName() {
return name;
public void setName(String name) {
this.name = name;
*{color:#3366ff}{color:#ff0000}hibernate.cfg.xml file{color}*
*<?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>*
* <!-- local connection properties -->*
* <property name="hibernate.connection.url">*
* jdbc:mysql://localhost:3306/test*
* </property>*
* <property name="hibernate.connection.driver_class">*
* com.mysql.jdbc.Driver*
* </property>*
* <property name="hibernate.connection.username">root</property>*
* <property name="hibernate.connection.password">server</property>*
* <!-- property name="hibernate.connection.pool_size"></property -->*
* <!-- dialect for MySQL -->*
* <property name="dialect">*
* org.hibernate.dialect.MySQLDialect*
* </property>*
* <property name="hibernate.show_sql">false</property>*
* <property name="hibernate.transaction.factory_class">*
* org.hibernate.transaction.JDBCTransactionFactory*
* </property>*
* <mapping resource="event/Sample.hbm.xml" />*
* </session-factory>*
*</hibernate-configuration>*
*{color:#ff0000}{color:#000000}Sample.hbm.xml file{color}*
*<?xml version="1.0" encoding="utf-8"?>*
*<!DOCTYPE hibernate-mapping PUBLIC*
* "-//Hibernate/Hibernate Mapping DTD//EN"*
* "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd" >*
*<hibernate-mapping package="event">*
* <class name="Sample" table="sample" >*
* <meta attribute="sync-DAO">true</meta>*
* <property name="Id" column="id" type="integer" not-null="false" length="11" />*
* <property name="Name" column="name" type="string" not-null="false" length="50" />*
* </class>*
*</hibernate-mapping>*
*{color}{color}*
*{color:#3366ff}
This is my error.{color}*
log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception occur:Could not parse mapping document from resource event/Sample.hbm.xml
org.hibernate.InvalidMappingException: Could not parse mapping document from resource event/Sample.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:575)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1593)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1561)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1540)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1514)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1434)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1420)
at Test.main(Test.java:15)
Caused by: org.hibernate.InvalidMappingException: Could not parse mapping document from invalid mapping
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:508)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:572)
... 7 more
Caused by: org.xml.sax.SAXParseException: The content of element type "class" must match "(meta*,subselect?,cache?,synchronize*,comment?,tuplizer*,(id|composite-id),discriminator?,natural-id?,(version|timestamp)?,(property|many-to-one|one-to-one|component|dynamic-component|properties|any|map|set|list|bag|idbag|array|primitive-array)*,((join*,subclass*)|joined-subclass*|union-subclass*),loader?,sql-insert?,sql-update?,sql-delete?,filter*,resultset*,(query|sql-query)*)".
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.createSAXParseException(Unknown Source)
at com.sun.org.apache.xerces.internal.util.ErrorHandlerWrapper.error(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLErrorReporter.reportError(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.handleEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.dtd.XMLDTDValidator.endElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLNSDocumentScannerImpl.scanEndElement(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl$FragmentContentDispatcher.dispatch(Unknown Source)
at com.sun.org.apache.xerces.internal.impl.XMLDocumentFragmentScannerImpl.scanDocument(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XML11Configuration.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.XMLParser.parse(Unknown Source)
at com.sun.org.apache.xerces.internal.parsers.AbstractSAXParser.parse(Unknown Source)
at org.dom4j.io.SAXReader.read(SAXReader.java:465)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:505)
... 8 more
Exception in thread "main" java.lang.NullPointerException
at Test.main(Test.java:29)