hi,
i have been able to create a JNDI sevice for hibernate but when i try and use it in my web App using the lookup() it returns an error.. pls help

this is my hibernateservice.xml
<server>
<mbean code="org.jboss.hibernate.jmx.Hibernate"
name="hiber:name=HibernateUtil">
<attribute name="DatasourceName">java:/PostgresDS</attribute>
<attribute name="Dialect">
org.hibernate.dialect.PostgreSQLDialect
</attribute>
<attribute name="SessionFactoryName">
java:/hiber/HibernateUtil
</attribute>
<attribute name="ShowSqlEnabled">true</attribute>
</mbean>
</server>

this is the code i am trying

InitialContext ctx = new InitialContext();
SessionFactory factory = (SessionFactory)ctx.lookup("java:/hiber/HibernateUtil");

Session session = factory.openSession()

Transaction tx = session.beginTransaction();
result = session.createQuery("from Event").list();
tx.commit();
session.close();

it returns a null pointer exception.. the stack trace from the log file is as follows...

2005-10-21 15:52:02,383 DEBUG [org.hibernate.impl.SessionFactoryObjectFactory] initializing class SessionFactoryObjectFactory
2005-10-21 15:52:02,403 DEBUG [org.hibernate.impl.SessionFactoryObjectFactory] JNDI lookup: hiber/HibernateUtil
2005-10-21 15:52:02,413 DEBUG [org.hibernate.impl.SessionFactoryObjectFactory] lookup: uid=2c9048960712b253010712b25d380000
2005-10-21 15:52:02,413 WARN [org.hibernate.impl.SessionFactoryObjectFactory] Not found: 2c9048960712b253010712b25d380000
2005-10-21 15:52:02,413 DEBUG [org.hibernate.impl.SessionFactoryObjectFactory] {}
2005-10-21 15:52:02,433 ERROR [org.apache.catalina.core.ContainerBase.[jboss.web].[localhost].[/testJNDIHibernate].[listEvents]] Servlet.service() for servlet listEvents threw exception
java.lang.NullPointerException
at hiber.listEvents.doPost(listEvents.java:64)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:810)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:252)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:202)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:173)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:178)
at org.jboss.web.tomcat.security.CustomPrincipalValve.invoke(CustomPrincipalValve.java:39)
at org.jboss.web.tomcat.security.SecurityAssociationValve.invoke(SecurityAssociationValve.java:159)
at org.jboss.web.tomcat.security.JaccContextValve.invoke(JaccContextValve.java:59)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:126)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:105)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:107)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:148)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:856)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.processConnection(Http11Protocol.java:744)
at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:527)
at org.apache.tomcat.util.net.MasterSlaveWorkerThread.run(MasterSlaveWorkerThread.java:112)
at java.lang.Thread.run(Thread.java:595)

i am not able to figure out why its not able to lookup for the JNDI name

Use
http://localhost:8080/jmx-console/
jboss
service=JNDIView
list()
in order to examine your JNDI tree.

Also you can try


--
Andrey Grebnev
http://www.jroller.com/page/agrebnev

hi,
thanks for replying back ... it is showing in the jndi-tree.. and i am using jBoss4.0.3 AS and hence i dont think
ctx.lookup("java:comp/env/hiber/HibernateUtil");
will be able to locate it. i had also mapped a datasource (PostgresDS) and am able to access is using "java:/PostgresDS".. is there anything else i am missing.. or would u like to see any other part of my code...

rgds
Amit

Class Loaders.

Hibernate uses an Object Factory for JNDI that stores the Hibernate Session Factory by a UID. When you look up the Session Factory, it takes the UID of the lookup, and tries to find the matching session factory in it's internal cache.

If you initialise the session factory in the same class loader, then you'll have a Session Factory Object Factory that has the UID -> Session Factory cached.

Hi,

-----------------------
Hibernate: 2.1.4
Oracle: 9i
Jboss: 3.2.6
-----------------------

I´m using lookup to get the jndi.

At this moment didn´t have any problem, but now
the SessionFactory, sometimes, is missing (null), and I need
restart the application server.



What can be occurring?

thanks

[]´s

Check that it's still bound using the JNDIView utility in JBoss - go to the JMX Console, find the JNDIView MBean, and on it's detail page invoke list method.

Now it´s OK, It´s bound.
but sometimes, it´s missing... :-(

thanxs

What is it correct?

1- lookup only one time and set the SessionFactory to a context for example; or
2- lookup at each use.

Depends on how your code is working.

Using EJBs we look the Session Factory up at the start of the call, get the current session, do the work in there and return. Never has a problem, but we're using Hibernate 3 and JBoss 4.

Post logs from those times that the session factory is missing.