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flam70
 Post subject: Problem with find method
PostPosted: Fri Dec 05, 2003 12:18 pm 
Beginner
Beginner

Joined: Thu Oct 02, 2003 8:02 am
Posts: 45
I have 2 classes Internaute and Login bind by a one-to-one bidirectionnal association.
When a user authenticates, i retrieve informations in order to create a Login object. Then i execute the following method :
Code:
public Internaute rechercherUtilisateur(Login l)
   {
      try
            {
               Session session = HibernateDAOFactory.creerConnection();
               String identifiant = l.getIdentifiant();
               Transaction tx = session.beginTransaction();
               List users = session.find("from Internaute as internaute where internaute.login =?",l,Hibernate.entity(Login.class));
               Iterator it = users.iterator();
               Internaute user=null;
               while ( it.hasNext())
               {
                  user = (Internaute)it.next();      
               }
               tx.commit();
               HibernateSession.closeSession();
                              return user;
                     
            }
            catch(Exception e)
            {
               e.printStackTrace();
               // return null;
            }
         }


I have the error message :
net.sf.hibernate.TransientObjectException: object references an unsaved transien
t instance - save the transient instance before flushing: com.cfort.utilisateur.
Login
at net.sf.hibernate.impl.SessionImpl.throwTransientObjectException(Sessi
onImpl.java:2385)
at net.sf.hibernate.impl.SessionImpl.getEntityIdentifierIfNotUnsaved(Ses
sionImpl.java:2377)
at net.sf.hibernate.type.EntityType.getIdentifier(EntityType.java:56)
at net.sf.hibernate.type.ManyToOneType.nullSafeSet(ManyToOneType.java:33
)
at net.sf.hibernate.loader.Loader.prepareQueryStatement(Loader.java:494)

at net.sf.hibernate.loader.Loader.doFind(Loader.java:136)
at net.sf.hibernate.loader.Loader.find(Loader.java:620)
at net.sf.hibernate.hql.QueryTranslator.find(QueryTranslator.java:928)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1343)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1322)
at net.sf.hibernate.impl.SessionImpl.find(SessionImpl.java:1318)
at com.cfort.dao.HibernateUtilisateurDAO.rechercherUtilisateur(Hibernate
UtilisateurDAO.java:109)
at com.cfort.service.UtilisateurService.rechercherUtilisateur(Utilisateu
rService.java:91)
at com.cfort.struts.action.LoginAction.execute(LoginAction.java:56)
at org.apache.struts.action.RequestProcessor.processActionPerform(Reques
tProcessor.java:484)
at org.apache.struts.action.RequestProcessor.process(RequestProcessor.ja
va:274)
at org.apache.struts.action.ActionServlet.process(ActionServlet.java:148
2)
at org.apache.struts.action.ActionServlet.doPost(ActionServlet.java:525)

at javax.servlet.http.HttpServlet.service(HttpServlet.java:763)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:856)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(Appl
icationFilterChain.java:284)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationF
ilterChain.java:204)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperV
alve.java:256)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardContextValve.invokeInternal(Standard
ContextValve.java:245)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextV
alve.java:199)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.j
ava:195)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.j
ava:164)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:149)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineVal
ve.java:156)
at org.apache.catalina.core.StandardValveContext.invokeNext(StandardValv
eContext.java:151)
at org.apache.catalina.core.StandardPipeline.invoke(StandardPipeline.jav
a:563)
at org.apache.catalina.core.ContainerBase.invoke(ContainerBase.java:972)

at org.apache.coyote.tomcat5.CoyoteAdapter.service(CoyoteAdapter.java:20
9)
at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java
:670)
at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.proce
ssConnection(Http11Protocol.java:517)
at org.apache.tomcat.util.net.TcpWorkerThread.runIt(PoolTcpEndpoint.java
:575)
at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadP
ool.java:666)
at java.lang.Thread.run(Thread.java:534)

I read the documentation and found an example with the same piece of code
Code:
List mates = sess.find(
    "from Cat as cat where cat.mate = ?",
    izi,
    Hibernate.entity(Cat.class)
);


Does it mean that the search criteria ( here Login object) must be persistent ?
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yannraoul
 Post subject:
PostPosted: Fri Dec 05, 2003 1:05 pm 
Beginner
Beginner

Joined: Tue Oct 07, 2003 11:36 am
Posts: 46
Location: Rennes, France
Salut,

U may forget saving a newly created user by doing a session.flush().

a+
Yann
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flam70
 Post subject:
PostPosted: Fri Dec 05, 2003 1:08 pm 
Beginner
Beginner

Joined: Thu Oct 02, 2003 8:02 am
Posts: 45
Sorry, but i don't understand what you exactly mean !
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yannraoul
 Post subject:
PostPosted: Fri Dec 05, 2003 1:12 pm 
Beginner
Beginner

Joined: Tue Oct 07, 2003 11:36 am
Posts: 46
Location: Rennes, France
Have u performed any operations on a Internaute object before calling this search method of Internaute ?

For example,
Internaute i = new Internaute();
i.setNom("toto");
i.save();
<--- do a flush here !
rechercherUtilisateur(new Login("blabla")); --> Exception !
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dimas
 Post subject:
PostPosted: Fri Dec 05, 2003 1:32 pm 
Expert
Expert

Joined: Tue Sep 16, 2003 4:06 pm
Posts: 318
Location: St. Petersburg, Russia
Er...
Why do you pass parameter of type String to find() and tell Hibernate its type is Login ?
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gavin
 Post subject:
PostPosted: Fri Dec 05, 2003 9:54 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
Look at the exception message:

Quote:
net.sf.hibernate.TransientObjectException: object references an unsaved transient instance -
save the transient instance before flushing: com.cfort.utilisateur.
Login



That is really quite helpful, I think.
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gavin
 Post subject:
PostPosted: Fri Dec 05, 2003 9:55 pm 
Hibernate Team
Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia
ie. The Login l is transient.
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flam70
 Post subject:
PostPosted: Mon Dec 08, 2003 10:35 am 
Beginner
Beginner

Joined: Thu Oct 02, 2003 8:02 am
Posts: 45
OK. The Login l is transient.
As i see, the criteria must be persistent !
So how can i do to retrieve a login by using a parameter of type login (enter by a user) in find method, knowing that the Login parameter is trancient (which seems to be logical for me) ?
THANKS
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yannraoul
 Post subject:
PostPosted: Mon Dec 08, 2003 10:45 am 
Beginner
Beginner

Joined: Tue Oct 07, 2003 11:36 am
Posts: 46
Location: Rennes, France
What happens when login is loaded from session.load() instead of new Login() ?
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emmanuel
 Post subject:
PostPosted: Mon Dec 08, 2003 11:20 am 
Hibernate Team
Hibernate Team

Joined: Sun Sep 14, 2003 3:54 am
Posts: 7256
Location: Paris, France
Example query might help
(section 14.6 of the reference guide)

_________________
Emmanuel

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dimas
 Post subject:
PostPosted: Mon Dec 08, 2003 12:01 pm 
Expert
Expert

Joined: Tue Sep 16, 2003 4:06 pm
Posts: 318
Location: St. Petersburg, Russia
Does your Login has ID property initialized?
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