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rogermichel
 Post subject: Null Pointer Exception
PostPosted: Mon Sep 01, 2003 3:00 pm 
Newbie

Joined: Mon Sep 01, 2003 2:49 pm
Posts: 8
Hello,
what is my mistake? I have opened the session with my own connection.(session = _sessions.openSession(con);) The connection is alredy testet.

But it throws a null pointer exception...

How can i close the session. Should i close my connection first, or after the session?

I used this code in a Sevlet witch is inherited from HTTPServlet. Could that be a problem?

Thanks in advance for some hints..
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steve
 Post subject:
PostPosted: Mon Sep 01, 2003 4:08 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 3:00 pm
Posts: 1816
Location: Austin, TX
What is the stack trace for the NPE?
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rogermichel
 Post subject: Re: Stack trace for npe
PostPosted: Tue Sep 02, 2003 2:35 am 
Newbie

Joined: Mon Sep 01, 2003 2:49 pm
Posts: 8
Hy steve,
I hope this informations will help to get my fault...


By running this code:

**************************************************************************

private void initStartParameters(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException, HibernateException {

Navigation nav= new Navigation();
nav.setId_node(300);
nav.setId_parent(1);
nav.setName("Test Roger...");
nav.setOrder(1);


Session session= null;
Transaction tx = null;
Connection con=null;
try {
System.out.println("Test: try to connect...");
con=this.getConnection();
System.out.println("Test: connection set "+con);
session = _sessions.openSession(con);
System.out.println("Test open session with connection");
tx = session.beginTransaction();
System.out.println("Test begin to transact");
session.save(nav);
System.out.println("Test save new nav");
tx.commit();
System.out.println("Commit");
}
catch (HibernateException he) {
if (tx!=null) tx.rollback();
System.out.println(he);

}
catch (Exception e) {
System.out.println(e);
e.printStackTrace();
}
finally {
try {
//session.close();
con.close();


} catch (SQLException e1) {
System.out.println(e1);
e1.printStackTrace();
}
}

}

**************************************************************************


The server prints:

**************************************************************************
[02.09.03 08:26:52:759 CEST] 45f68a76 SystemOut O Test: try to connect...
[02.09.03 08:26:53:149 CEST] 45f68a76 SystemOut O Test: connection set
DB2Connection
{
connectionHandle = 1
SPConnected = false
source = erm
user = rmi
conArgs =
closed = false
describeCached = false
describeParam = true
isReadOnly = false
autoClose = false
LONGDATA compat = false
}

[02.09.03 08:26:53:165 CEST] 45f68a76 SystemOut O java.lang.NullPointerException
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R java.lang.NullPointerException
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at com.clavisNET.erm.general.NavControllerHibernate2.initStartParameters(NavControllerHibernate2.java:201)
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at com.clavisNET.erm.general.NavControllerHibernate2.doPost(NavControllerHibernate2.java:99)
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at com.clavisNET.erm.general.NavControllerHibernate2.doGet(NavControllerHibernate2.java:162)
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
[02.09.03 08:26:53:181 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:948)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:530)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:176)
[02.09.03 08:26:53:196 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:79)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:201)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:610)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:435)
[02.09.03 08:26:53:212 CEST] 45f68a76 SystemErr R at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)
**************************************************************************

Thanks for your effort
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gavin
 Post subject:
PostPosted: Tue Sep 02, 2003 2:46 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
Looks to me like the _sessions instvar is null. I suggest you try stepping through code to see if the session factory is really there.
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rogermichel
 Post subject: Sorry...
PostPosted: Tue Sep 02, 2003 4:07 am 
Newbie

Joined: Mon Sep 01, 2003 2:49 pm
Posts: 8
Sorry for this stupid fault, but that can happend when i'm testing and trying. But i have now already some new problems...

I now its realy bad, but if i have my first example, everything will be better.

The exception occured by calling buildsessionFactory.

By calling this fubnctions:
******************************************************************************************
public void configure() throws HibernateException {
Configuration cfg=new Configuration().addClass(Navigation.class);
_sessions = cfg.buildSessionFactory();
System.out.println("Session factory: "+_sessions);
}

public void exportTables() throws HibernateException {
Configuration cfg = new Configuration().addClass(Navigation.class);
new SchemaExport(cfg).create(true, true);
}

******************************************************************************

The Server prints:

*****************************************************************************
[02.09.03 09:47:22:197 CEST] 7817d261 WebGroup I SRVE0180I: [ERM] [/ERM] [Servlet.LOG]: NavControllerHibernate2: init
[02.09.03 09:47:22:306 CEST] 7817d261 WebGroup E SRVE0026E: [Servlet-Fehler]-[org/dom4j/Attribute]: java.lang.NoClassDefFoundError: org/dom4j/Attribute
at com.clavisNET.erm.general.NavControllerHibernate2.configure(NavControllerHibernate2.java:71)
at com.clavisNET.erm.general.NavControllerHibernate2.doPost(NavControllerHibernate2.java:90)
at com.clavisNET.erm.general.NavControllerHibernate2.doGet(NavControllerHibernate2.java:170)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:740)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:853)
at com.ibm.ws.webcontainer.servlet.StrictServletInstance.doService(StrictServletInstance.java:110)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet._service(StrictLifecycleServlet.java:174)
at com.ibm.ws.webcontainer.servlet.IdleServletState.service(StrictLifecycleServlet.java:313)
at com.ibm.ws.webcontainer.servlet.StrictLifecycleServlet.service(StrictLifecycleServlet.java:116)
at com.ibm.ws.webcontainer.servlet.ServletInstance.service(ServletInstance.java:283)
at com.ibm.ws.webcontainer.servlet.ValidServletReferenceState.dispatch(ValidServletReferenceState.java:42)
at com.ibm.ws.webcontainer.servlet.ServletInstanceReference.dispatch(ServletInstanceReference.java:40)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.handleWebAppDispatch(WebAppRequestDispatcher.java:948)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.dispatch(WebAppRequestDispatcher.java:530)
at com.ibm.ws.webcontainer.webapp.WebAppRequestDispatcher.forward(WebAppRequestDispatcher.java:176)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.doForward(WebAppInvoker.java:79)
at com.ibm.ws.webcontainer.srt.WebAppInvoker.handleInvocationHook(WebAppInvoker.java:201)
at com.ibm.ws.webcontainer.cache.invocation.CachedInvocation.handleInvocation(CachedInvocation.java:71)
at com.ibm.ws.webcontainer.srp.ServletRequestProcessor.dispatchByURI(ServletRequestProcessor.java:182)
at com.ibm.ws.webcontainer.oselistener.OSEListenerDispatcher.service(OSEListener.java:334)
at com.ibm.ws.webcontainer.http.HttpConnection.handleRequest(HttpConnection.java:56)
at com.ibm.ws.http.HttpConnection.readAndHandleRequest(HttpConnection.java:610)
at com.ibm.ws.http.HttpConnection.run(HttpConnection.java:435)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:593)

*****************************************************************************

Thanks, i realy hope after this problem every thing is ok and i don't bother you again.
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christian
 Post subject:
PostPosted: Tue Sep 02, 2003 4:09 am 
Hibernate Team
Hibernate Team

Joined: Mon Aug 25, 2003 9:11 pm
Posts: 4592
Location: Switzerland
I recommend you read and work step by step with the "Hibernate Tomcat Quickstart Tutorial", from HibernateExamples.

_________________
JAVA PERSISTENCE WITH HIBERNATE
http://jpwh.org
Get the book, training, and consulting for your Hibernate team.

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gavin
 Post subject:
PostPosted: Tue Sep 02, 2003 4:11 am 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
you must have dom4j.jar in your classpath
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