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Black Phoenix
 Post subject: Recursive association with Hibernate
PostPosted: Mon Apr 05, 2010 4:50 pm 
Newbie

Joined: Wed Mar 24, 2010 2:58 am
Posts: 10
Location: Livorno,Italy
I have to map a recursive association: i mean that i have to persist one POJO, Part,which consist of other Part object (a collection).
How can i map that with annotations and what type of association i have to use?
Thank you and sorry for my bad english,

Daniel
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aukemid
 Post subject: Re: Recursive association with Hibernate
PostPosted: Tue Apr 06, 2010 3:07 am 
Regular
Regular

Joined: Wed Mar 10, 2010 4:48 am
Posts: 106
Example:
Code:
<hibernate-mapping>
   <class name="Measurement" table="measurements">
      <id name="id" column="id">
         <generator class="assigned" />
      </id>

      <many-to-one name="smallest" class="Measurement" column="smallest" />

      <set name="measurements" table="measurements" cascade="delete">
         <key column="smallest" />
         <one-to-many class="Measurement" />
      </set>
   </class>
</hibernate-mapping>

Smallest is a FK to a parent object of Measurement. The set measurements contains the childrens.
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Black Phoenix
 Post subject: Re: Recursive association with Hibernate
PostPosted: Sat Apr 17, 2010 6:34 pm 
Newbie

Joined: Wed Mar 24, 2010 2:58 am
Posts: 10
Location: Livorno,Italy
i've tried, it says to me

Quote:
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Programmi/NetBeans%206.7.1/slf4j-1.5.8/slf4j-simple-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Programmi/NetBeans%206.7.1/hibernate-annotations-3.4.0.GA/lib/test/slf4j-log4j12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
31 [main] INFO org.hibernate.cfg.Environment - Hibernate 3.3.2.GA
31 [main] INFO org.hibernate.cfg.Environment - hibernate.properties not found
62 [main] INFO org.hibernate.cfg.Environment - Bytecode provider name : javassist
78 [main] INFO org.hibernate.cfg.Environment - using JDK 1.4 java.sql.Timestamp handling
265 [main] INFO org.hibernate.cfg.Configuration - configuring from resource: /hibernate.cfg.xml
265 [main] INFO org.hibernate.cfg.Configuration - Configuration resource: /hibernate.cfg.xml
546 [main] INFO org.hibernate.cfg.Configuration - Reading mappings from resource : prova.hbm.xml
750 [main] INFO org.hibernate.cfg.HbmBinder - Mapping class: Prova -> prova
968 [main] INFO org.hibernate.cfg.Configuration - Configured SessionFactory: null
984 [main] INFO org.hibernate.cfg.HbmBinder - Mapping collection: Prova.prove -> prova
Exception in thread "main" org.hibernate.MappingException: Duplicate property mapping of codice found in Prova
at org.hibernate.mapping.PersistentClass.checkPropertyDuplication(PersistentClass.java:477)
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:467)
at org.hibernate.mapping.RootClass.validate(RootClass.java:215)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1149)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1334)
at Main.main(Main.java:22)
Java Result: 1


This is the xml mapping file:

Code:
<?xml version="1.0" encoding="UTF-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="Prova" table="prova">
        <id name="id" type="int"/>
         <property name="codice" type="int"/>
              <property name="nome" type="string"/>
           <many-to-one name="codice" class="Prova" column="codice"/>

<set name="prove" table="prova" >
         <key column="codice" />
         <one-to-many class="Prova" />
      </set>

           

     
    </class>
</hibernate-mapping>


Why it doesn't found? i don't understand...
Thank you,
Daniel
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aukemid
 Post subject: Re: Recursive association with Hibernate
PostPosted: Mon Apr 19, 2010 3:31 am 
Regular
Regular

Joined: Wed Mar 10, 2010 4:48 am
Posts: 106
Black Phoenix wrote:
If you get an error like this read it.
Quote:
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/C:/Programmi/NetBeans%206.7.1/slf4j-1.5.8/slf4j-simple-1.5.8.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/C:/Programmi/NetBeans%206.7.1/hibernate-annotations-3.4.0.GA/lib/test/slf4j-log4j12.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
...


It means there are two slf4j bindings found and it doesn't know which to use.
Solution: remove one of them.
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Black Phoenix
 Post subject: Re: Recursive association with Hibernate
PostPosted: Tue Apr 20, 2010 2:02 pm 
Newbie

Joined: Wed Mar 24, 2010 2:58 am
Posts: 10
Location: Livorno,Italy
I think this isn't the problem, because other applications give me the same slf4j error but are ok.
I think the real problem is in this part:
Code:
Exception in thread "main" org.hibernate.MappingException: Duplicate property mapping of codice found in Prova
at org.hibernate.mapping.PersistentClass.checkPropertyDuplication(PersistentClass.java:477)
at org.hibernate.mapping.PersistentClass.validate(PersistentClass.java:467)
at org.hibernate.mapping.RootClass.validate(RootClass.java:215)
at org.hibernate.cfg.Configuration.validate(Configuration.java:1149)
at org.hibernate.cfg.Configuration.buildSessionFactory(Configuration.java:1334)
at Main.main(Main.java:22)
Java Result: 1

Exception in thread "main" org.hibernate.MappingException: Duplicate property mapping of codice found in Prova

Someone can help me?
Thank you,
Daniel
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aukemid
 Post subject: Re: Recursive association with Hibernate
PostPosted: Wed Apr 21, 2010 3:13 am 
Regular
Regular

Joined: Wed Mar 10, 2010 4:48 am
Posts: 106
Black Phoenix wrote:
<class name="Prova" table="prova">
<id name="id" type="int"/>
<property name="codice" type="int"/>
<property name="nome" type="string"/>
<many-to-one name="codice" class="Prova" column="codice"/>

<set name="prove" table="prova" >
<key column="codice" />
<one-to-many class="Prova" />
</set>
</class>
Quote:
Exception in thread "main" org.hibernate.MappingException: Duplicate property mapping of codice found in Prova

You have two properties called codice, so if you need both you should rename one of them.
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