I am a newbie to hibernate. I am doing the example specified in www.hibernate.org and using oracle as the database.

When I run the program I get the error :

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: events/Event.hbm.xml
java.lang.ExceptionInInitializerError
at util.HibernateUtil.<clinit>(Unknown Source)
at events.EventManager.createAndStoreEvent(Unknown Source)
at events.EventManager.main(Unknown Source)
Caused by: org.hibernate.MappingException: Could not read mappings from resource: events/Event.hbm.xml
at org.hibernate.cfg.Configuration.addResource(Configuration.java:484)
at org.hibernate.cfg.Configuration.parseMappingElement(Configuration.java:1443)
at org.hibernate.cfg.Configuration.parseSessionFactory(Configuration.java:1411)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1392)
at org.hibernate.cfg.Configuration.doConfigure(Configuration.java:1368)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1288)
at org.hibernate.cfg.Configuration.configure(Configuration.java:1274)
... 3 more
Caused by: org.hibernate.MappingException: Could not parse mapping document in input stream
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:430)
at org.hibernate.cfg.Configuration.addResource(Configuration.java:481)
... 9 more
Caused by: org.dom4j.DocumentException: Error on line 2 of document : XML declaration may only begin entities. Nested exception: XML declaration may only begin entities.
at org.dom4j.io.SAXReader.read(SAXReader.java:482)
at org.hibernate.cfg.Configuration.addInputStream(Configuration.java:421)
... 10 more
Exception in thread "main"

----------------------------------------------------------------------------------

my hibernate.cfg.xml is :

<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">

<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">oracle.jdbc.Driver.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:thin:@172.17.8.52:1521:IFHT03</property>
<property name="hibernate.connection.datasource"> java:comp/env/jdbc/HibAppDS</property>
<property name="hibernate.connection.username">daweb_user</property>
<property name="hibernate.connection.password">daweb_user</property>
<property name="hibernate.connection.pool_size">1</property>
<property name="dialect">org.hibernate.dialect.OracleDialect</property>
<property name="show_sql">true</property>
<property name="hibernate.hbm2ddl.auto">select</property>
<property name="hibernate.hbm2ddl.auto">create</property>

<mapping resource="events/Event.hbm.xml"/>
<class-cache class="/events/Event" region="Event" usage="read-write"/>
</session-factory>
</hibernate-configuration>
---------------------------------------------------------------------------------

and Event.hbm.xml is :

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


<hibernate-mapping>

<class name="events.Event" table="EVENTS">
<id name="id" column ="EVENT_ID" type="integer"/>
<generator class="native"/>
</id>
<property name="dt" type="timestamp" column="EVENT_DATE"/>
<property name="title" column="TITLE"/>
</class>

</hibernate-mapping>


Can any one help me what causes these errors ?

Thanks,
JSV

Event.hbm.xml is foobar

The xml declaration was wrong heance "line 2" error, plus you had closed the class tag early - try this...

Thank you very much for the response. The xml error vanished.

But there comes a new error :

Initial SessionFactory creation failed.org.hibernate.MappingException: Cannot cache an unknown entity: events/Event

Why is this please ?

I have put the Event class in src/events/Event.java

sounds like you don't have a class called events.Event on the classpath

(p-s. when someone solves a problem you give them credit ;o)

I have removed this line from the hibernate.cfg.xml.
<class-cache class="events/Event" region="Event" usage="read-write"/>

But now the error became

Caused by: org.hibernate.HibernateException: JDBC Driver class not found: oracle.jdbc.driver.OracleDriver

the driver class is correct. I was using for this for other applications.

Cannt get why this happens ?

You need classes12.zip or the oracle jar on the classpath

Thank you so much Tim.

But still my problem exists . The new error is

Initial SessionFactory creation failed.java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
java.lang.ExceptionInInitializerError
at util.HibernateUtil.<clinit>(Unknown Source)
at events.EventManager.createAndStoreEvent(Unknown Source)
at events.EventManager.main(Unknown Source)
Caused by: java.lang.NoClassDefFoundError: net/sf/ehcache/CacheException
at java.lang.Class.getDeclaredConstructors0(Native Method)
at java.lang.Class.privateGetDeclaredConstructors(Class.java:1610)
at java.lang.Class.getConstructor0(Class.java:1922)
at java.lang.Class.newInstance0(Class.java:278)
at java.lang.Class.newInstance(Class.java:261)
at org.hibernate.cfg.SettingsFactory.createCacheProvider(SettingsFactory.java:327)
at org.hibernate.cfg.SettingsFactory.buildSettings(SettingsFactory.java:219)
at org.hibernate.cfg.Configuration.buildSettings(Configuration.java:1859)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1152)
... 3 more
Exception in thread "main"

Do I need to give the tag

<class-cache class="events/Event" region="Event" usage="read-write"/>
in the hibernate.cfg.xml ? If then is that tag right ? Where to place it in the xml ?

Please Tim

I have solved the cache problem. I needed ehcache-1.1.jar for that.

Thanks.

but org.hibernate.HibernateException: No CurrentSessionContext configured!
at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:504)
at events.EventManager.createAndStoreEvent(Unknown Source)
at events.EventManager.main(Unknown Source)
Exception in thread "main"

why is this ?

Do you have ehcache-1.1.jar on your classpath?
It should be in your Hibernate installation somewhere.

guess we posted at the same time ;)

Use this helper class to create the session.

"sessionFactory = new Configuration().configure() .buildSessionFactory();"

You are probably missing the configure() I think

He forgot to specify the sessioncontextclass in the config file, like

Tim,

My HibernateUtil class is as follows :

package util;

import org.hibernate.*;
import org.hibernate.cfg.*;

public class HibernateUtil {

private static final SessionFactory sessionFactory;

static {
try {
// Create the SessionFactory from hibernate.cfg.xml

sessionFactory = new Configuration().configure().buildSessionFactory();
System.out.println("indise hibernate util ...");
} 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;
}

}

seems I have given configure()

Either way will work - never seen your approach. I use Spring...

That seems working, but i got another set of error :

Hibernate: select hibernate_sequence.nextval from dual
org.hibernate.exception.SQLGrammarException: could not get next sequence value
at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:65)
at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:96)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId(AbstractSaveEventListener.java:91)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGeneratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:186)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrRequestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTransient(DefaultSaveOrUpdateEventListener.java:175)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpdate(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:544)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:533)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:529)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:324)
at org.hibernate.context.ThreadLocalSessionContext$TransactionProtectionWrapper.invoke(ThreadLocalSessionContext.java:292)
at $Proxy0.save(Unknown Source)
at events.EventManager.createAndStoreEvent(Unknown Source)
at events.EventManager.main(Unknown Source)
Caused by: java.sql.SQLException: ORA-02289: sequence does not exist

at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:168)
at oracle.jdbc.ttc7.TTIoer.processError(TTIoer.java:208)
at oracle.jdbc.ttc7.Oall7.receive(Oall7.java:543)
at oracle.jdbc.ttc7.TTC7Protocol.doOall7(TTC7Protocol.java:1405)
at oracle.jdbc.ttc7.TTC7Protocol.parseExecuteDescribe(TTC7Protocol.java:643)
at oracle.jdbc.driver.OracleStatement.doExecuteQuery(OracleStatement.java:1674)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1870)
at oracle.jdbc.driver.OraclePreparedStatement.executeUpdate(OraclePreparedStatement.java:363)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:314)
at org.hibernate.id.SequenceGenerator.generate(SequenceGenerator.java:75)
... 17 more
Exception in thread "main"

need to change the generator class ? i gave it as ' native'