hibernate-devel

[Hibernate] Problem using Xdoclet to generate relationships [newbie]

[Matt R. <ma...@ra...>]

I'm a rookie at using Hibernate, so please bear with me.

I have User object that has a one-to-many mapping to a Resume object.  I
am getting the exception below when trying to persist the resume.

I believe I might be doing something wrong with the addMethod method on
my DAO.  The passed in "resume" object already has a "user" object set
on it.

    public Resume addResume(Resume resume) 
        throws DAOException
    {
        User user = null;
        Session ses = null;
        
        try
        {
            ses = sessionFactory.openSession();
           
            // validate that a user exists for this resume
            if (resume.getUser() == null) {
                throw new DAOException("No user assigned to resume!");
            } 
                     
            ses.save(resume);
            
            ses.flush();
            ses.connection().commit();
        }
        catch (Exception e)
        {            
            try { ses.connection().rollback(); } 
            catch (Exception ex) { e.printStackTrace(); };
            throw new DAOException(e);
        }
        finally 
        {
            try { ses.close(); } 
            catch (Exception ex) { ex.printStackTrace(); };
        }
        return resume;
    }



Testcase:
testAddResume(org.apache.persistence.ApplicationDAOHibernateTest):
Caused an ERROR
java.lang.ClassCastException
org.apache.persistence.DAOException: java.lang.ClassCastException
    at
org.apache.persistence.ApplicationDAOHibernate.addResume(ApplicationDAOH
ibernate.java:146)
    at
org.apache.persistence.ApplicationDAOHibernateTest.testAddResume(Applica
tionDAOHibernateTest.java:82)

    at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
    at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.jav
a:39)
    at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessor
Impl.java:25)
Caused by: java.lang.ClassCastException
    at cirrus.hibernate.type.StringType.set(StringType.java:20)
    at
cirrus.hibernate.type.NullableType.nullSafeSet(NullableType.java:32)
    at
cirrus.hibernate.type.NullableType.nullSafeSet(NullableType.java:24)
    at
cirrus.hibernate.persister.EntityPersister.dehydrate(EntityPersister.jav
a:394)
    at
cirrus.hibernate.persister.EntityPersister.insert(EntityPersister.java:4
76)
    at
cirrus.hibernate.impl.ScheduledInsertion.execute(ScheduledInsertion.java
:20)
    at
cirrus.hibernate.impl.SessionImpl.executeAll(SessionImpl.java:1674)
    at cirrus.hibernate.impl.SessionImpl.execute(SessionImpl.java:1654)
    at cirrus.hibernate.impl.SessionImpl.flush(SessionImpl.java:1599)
    at
org.apache.persistence.ApplicationDAOHibernate.addResume(ApplicationDAOH
ibernate.java:139)
    ... 15 more

Re: [Hibernate] Problem using Xdoclet to generate relationships [newbie]

[Konstantin P. <kpr...@ya...>]

--- Matt Raible <ma...@ra...> wrote:
> I'm a rookie at using Hibernate, so please bear with
> me.
> 
> I have User object that has a one-to-many mapping to
> a Resume object.  I
> am getting the exception below when trying to
> persist the resume.
> 
> I believe I might be doing something wrong with the
> addMethod method on
> my DAO.  The passed in "resume" object already has a
> "user" object set
> on it.
> 

It looks that it does not like  your classes...
Unfortunately you did not provided line numbers in yur
snippet - si I can not say what exactly offendet
hibernate...

regards,

=====
Konstantin Priblouda ( ko5tik )    Freelance Software developer
< http://www.pribluda.de > < play java games -> http://www.yook.de >
< render charts online -> http://www.pribluda.de/povray/ >

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RE: [Hibernate] Problem using Xdoclet to generate relationships [newbie]

[Matt R. <ma...@ra...>]

I got it to work by looking at your example Konstantin.  Thanks!

Now I'm having a problem where I want to set a unique contraint on name
and userId in my resume table.  Following Konstantin's example, I have
my one-to-many relationship information on my User class, and the Resume
class just has a userId column.  In other words, the Resume knows
nothing about the relationship (right).

Is it possible to change my getResume's xdoclet tags to handle this?

    /**
     * Returns the resumes.
     * @return Set
     * 
     * @hibernate.set role="resumes" table="resume" 
     * @hibernate.collection-key column="id" length="32"
     * @hibernate.collection-one-to-many
class="org.apache.persistence.Resume"
     * @ejb.persistence
     */
    public Set getResumes() {
        return resumes;
    }

Thanks,

Matt

> -----Original Message-----
> From: hib...@li... 
> [mailto:hib...@li...] On 
> Behalf Of Konstantin Priblouda
> Sent: Sunday, December 22, 2002 7:00 AM
> To: Matt Raible
> Cc: hibernate-devel
> Subject: Re: [Hibernate] Problem using Xdoclet to generate 
> relationships [newbie]
> 
> 
> 
> --- Matt Raible <ma...@ra...> wrote:
> > I'm a rookie at using Hibernate, so please bear with
> > me.
> > 
> > I have User object that has a one-to-many mapping to
> > a Resume object.  I
> > am getting the exception below when trying to
> > persist the resume.
> > 
> > I believe I might be doing something wrong with the
> > addMethod method on
> > my DAO.  The passed in "resume" object already has a
> > "user" object set
> > on it.
> > 
> 
> It looks that it does not like  your classes...
> Unfortunately you did not provided line numbers in yur
> snippet - si I can not say what exactly offendet
> hibernate...
> 
> regards,
> 
> =====
> Konstantin Priblouda ( ko5tik )    Freelance Software developer
> < http://www.pribluda.de > < play java games -> 
http://www.yook.de > < render charts online ->
http://www.pribluda.de/povray/ >

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RE: [Hibernate] Problem using Xdoclet to generate relationships [newbie]

[Konstantin P. <kpr...@ya...>]

--- Matt Raible <ma...@ra...> wrote:
> I got it to work by looking at your example
> Konstantin.  Thanks!
> 
> Now I'm having a problem where I want to set a
> unique contraint on name
> and userId in my resume table.  Following
> Konstantin's example, I have
> my one-to-many relationship information on my User
> class, and the Resume
> class just has a userId column.  In other words, the
> Resume knows
> nothing about the relationship (right).
> 
> Is it possible to change my getResume's xdoclet tags
> to handle this?

Give XDoclet GUI a spin - it provides [rudientary]
help
in tagging your classes... And also some explanations.


regards,

=====
Konstantin Priblouda ( ko5tik )    Freelance Software developer
< http://www.pribluda.de > < play java games -> http://www.yook.de >
< render charts online -> http://www.pribluda.de/povray/ >

__________________________________________________
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Yahoo! Mail Plus - Powerful. Affordable. Sign up now.
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