Inifinite loop loading objects

msheftel · **Joined:** Thu Oct 09, 2003 3:42 pm **Posts:** 22

Using 2.1 beta 4

Hi all, I have a system with three classes: Communications, Segments and SegmentResults. Each Communication has a list of Segments and eache Segment has a list of SegmentResults. Both Segments and SegmentResults have references back to their "owing objects" (mapping file follows)

When I load a Communication e.g

Code:

Communication c = (Communication)sess.load(Communication.class,"BBBBJ3R3BBBN");

everything works as I want it too.

But if I load a Segment e.g.

Code:

Segment c = (Segment)sess.load(Segment.class,"BBBBJ3R4BBJR");

The system appears to go into an infinite loop loading the segment over and over.

Any ideas what might be causing this?

Thanks, Marc

Code:

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 2.0//EN" "http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping>
    <class name="com.teradata.crm.tracer.examples.Folder.entity.Communication" table="IOS_ECAMP">
        <id name="ecampId" type="java.lang.String">
            <column name="ECAMP_ID" length="12"/>
            <generator class="com.teradata.crm.tracer.examples.Folder.entity.IdGenerator.KhariGenerator"/>
        </id>
        <set name="segmentsHibernate" table="IOS_ECAMP_X_SEG" inverse="true" lazy="false" outer-join="true" cascade="save-update">
            <key column="ECAMP_ID"/>
            <one-to-many class="com.teradata.crm.tracer.examples.Folder.entity.Segment"/>
        </set>
        <!-- other properties -->
    </class>
    <class name="com.teradata.crm.tracer.examples.Folder.entity.SegmentResult" table="IOS_ECAMP_SEG_RES">
        <composite-id name="objectId" class="com.teradata.crm.tracer.examples.Folder.entity.PK.SegResPk">
            <key-many-to-one name="segment" class="com.teradata.crm.tracer.examples.Folder.entity.Segment" column="SEG_ID"/>
            <key-property name="custLevelCode" column="CUST_LEV_CD" type="java.lang.String"/>
        </composite-id>
        <!-- other properties -->
    </class>
    <class name="com.teradata.crm.tracer.examples.Folder.entity.Segment" table="IOS_ECAMP_X_SEG">
        <id name="segId" type="java.lang.String">
            <column name="SEG_ID" length="12"/>
            <generator class="com.teradata.crm.tracer.examples.Folder.entity.IdGenerator.KhariGenerator"/>
        </id>
        <set name="resultsHibernate" table="IOS_ECAMP_SEG_RES" inverse="true" lazy="false" outer-join="true" cascade="delete">
            <key column="SEG_ID"/>
            <one-to-many class="com.teradata.crm.tracer.examples.Folder.entity.SegmentResult"/>
        </set>
        <many-to-one name="communication" column="ECAMP_ID" class="com.teradata.crm.tracer.examples.Folder.entity.Communication" outer-join="true"/>
      <!-- other properties -->
    </class>
</hibernate-mapping>

gavin · **Posted:** Thu Oct 30, 2003 5:52 pm

This is a FAQ! Implement equals()/hashCode() properly for the composite id.

emmanuel · **Posted:** Thu Oct 30, 2003 5:59 pm

Does this http://www.hibernate.org/116.html#A19, that http://www.hibernate.org/hib_docs/reference/html_single/#or-mapping-s1-4b and that http://www.hibernate.org/hib_docs/reference/html_single/#components-s2-3 help ?

msheftel · **Joined:** Thu Oct 09, 2003 3:42 pm **Posts:** 22

I was a little bit confused on this point. I am using a composite key for the SegmentResult class and overrode the equals and hashCode methods in the key class (SegResPK). Do I also need to overide equals and hashCode in the SegmentResults class?

Thanks for all of you help.

msheftel · **Joined:** Thu Oct 09, 2003 3:42 pm **Posts:** 22

I'm starting to think that this problem does not have anything to do with hashCode and equals method. I put breakpoints in my implementation of these methods in the SegmentResult and SegResPK class and none of the methods ever get executed.

Any other ideas?

emmanuel · **Posted:** Fri Oct 31, 2003 12:58 pm

You have table attribute on a set representing a one-to-many relationship.

This is useless since hibernate can gess it from the one-to-many class.
May be the cause of your pb ?

Quote:

A one to many association links the tables of two classes directly, with no intervening collection table. (This implements a one-to-many relational model.)

dimas · **Posted:** Fri Oct 31, 2003 9:40 pm

Btw, what is the meaning of inverse="true" for the resultsHibernate set?

emmanuel · **Posted:** Sat Nov 01, 2003 1:43 pm

There are some recent threadd on this topic.
[url]http://forum.hibernate.org/viewtopic.php?t=925100[/url
http://forum.hibernate.org/viewtopic.php?t=925201&highlight=inverse

msheftel · **Joined:** Thu Oct 09, 2003 3:42 pm **Posts:** 22

I ended up removing the key-many-to-one from the SegmentResult composite key and replaced it with the String property for the id of the object that the key-many-to-one was referring to.

This isn't the most ideal solution for us but it works ... and thats always a good thing.

I'll probably play around with this a little bit more down the road but I need to move on for now.

Emmanuel, thanks for your help.

-marc