Erro no update

Boa noite, sou novo com java estou começando agora.
Alguem sabe como resolver este erro.

log4j:WARN No appenders could be found for logger (org.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
08/02/2012 21:33:51 org.apache.catalina.core.ApplicationContext log
INFO: Marking servlet HibernateTeste as unavailable
08/02/2012 21:33:51 org.apache.catalina.core.StandardContext loadOnStartup
GRAVE: Servlet /SiteWeb threw load() exception
org.hibernate.HibernateException: No CurrentSessionContext configured!
	at org.hibernate.impl.SessionFactoryImpl.getCurrentSession(SessionFactoryImpl.java:542)
	at br.com.SiteWeb.dao.HibernateDAO.salvar(HibernateDAO.java:22)
	at br.com.SiteWeb.Controller.HibernateTeste.<init>(HibernateTeste.java:29)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
	at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
	at java.lang.reflect.Constructor.newInstance(Unknown Source)
	at java.lang.Class.newInstance0(Unknown Source)
	at java.lang.Class.newInstance(Unknown Source)
	at org.apache.catalina.core.DefaultInstanceManager.newInstance(DefaultInstanceManager.java:125)
	at org.apache.catalina.core.StandardWrapper.loadServlet(StandardWrapper.java:1136)
	at org.apache.catalina.core.StandardWrapper.load(StandardWrapper.java:1080)
	at org.apache.catalina.core.StandardContext.loadOnStartup(StandardContext.java:5015)
	at org.apache.catalina.core.StandardContext.startInternal(StandardContext.java:5302)
	at org.apache.catalina.util.LifecycleBase.start(LifecycleBase.java:150)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1568)
	at org.apache.catalina.core.ContainerBase$StartChild.call(ContainerBase.java:1558)
	at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
	at java.util.concurrent.FutureTask.run(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
08/02/2012 21:33:51 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\HAF922\Documents\apache-tomcat-7.0.25\webapps\docs
08/02/2012 21:33:51 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\HAF922\Documents\apache-tomcat-7.0.25\webapps\examples
08/02/2012 21:33:51 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: contextInitialized()
08/02/2012 21:33:51 org.apache.catalina.core.ApplicationContext log
INFO: SessionListener: contextInitialized()
08/02/2012 21:33:51 org.apache.catalina.core.ApplicationContext log
INFO: ContextListener: attributeAdded('org.apache.jasper.compiler.TldLocationsCache', 'org.apache.jasper.compiler.TldLocationsCache@1ab600f')
08/02/2012 21:33:51 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\HAF922\Documents\apache-tomcat-7.0.25\webapps\host-manager
08/02/2012 21:33:51 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\HAF922\Documents\apache-tomcat-7.0.25\webapps\manager
08/02/2012 21:33:51 org.apache.catalina.startup.HostConfig deployDirectory
INFO: Deploying web application directory C:\Users\HAF922\Documents\apache-tomcat-7.0.25\webapps\ROOT
08/02/2012 21:33:51 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["http-bio-8080"]
08/02/2012 21:33:51 org.apache.coyote.AbstractProtocol start
INFO: Starting ProtocolHandler ["ajp-bio-8009"]
08/02/2012 21:33:51 org.apache.catalina.startup.Catalina start
INFO: Server startup in 29992 ms

Quem poder mi ajudar desde ja fico muito grato.

JavaEvangelist Membro desde: 11/10/2011 10:23:41 Mensagens: 328 Offline

crie um arquivo log4j.properties e coloque isso

# Usando 2 appenders, 1 para logar no console, outro para um arquivo
log4j.rootCategory=DEBUG, stdout, fileOut

# Imprime somente mensagens com 'priority' WARN ou mais alto para o logger
#lembrando a ordem: DEBUG - INFO - WARN - ERROR - FATAL
log4j.category.SEU.LOGGER.NAME=WARN

# Explicita a herança do nivel de prioridade
#log4j.category.your.category.name=INHERITED

#### O primeiro appender escreve no console
log4j.appender.stdout=org.apache.log4j.ConsoleAppender
log4j.appender.stdout.layout=org.apache.log4j.PatternLayout

# Pattern que mostra o nome do arquivo e numero da linha.
log4j.appender.stdout.layout.ConversionPattern=%5p [%t] (%F:%L) - %m%n

#### O segundo appender escreve em um arquivo
log4j.appender.fileOut =org.apache.log4j.RollingFileAppender
log4j.appender.fileOut.File=example.log

# Controla o tamanho maximo do arquivo
log4j.appender.fileOut.MaxFileSize=100KB

# Faz backup dos arquivos de log (apenas 1)
log4j.appender.fileOut.MaxBackupIndex=1

log4j.appender.fileOut.layout=org.apache.log4j.PatternLayout
log4j.appender.fileOut.layout.ConversionPattern=%p %t %c - %m%n

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