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Classcast Exception from Loader

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TripleDuty

Post subject: Classcast Exception from Loader

Posted: Mon Sep 08, 2003 6:38 am

Newbie

Joined: Mon Sep 08, 2003 4:24 am
Posts: 1

I'm new to Hibernate so possibly I am doing something terribly wrong or haven't read the manual correctly.

I receive the following Classcast exception:

Code:

java.lang.ClassCastException: org.wmt.pdc.KZPContractPartner
  at net.sf.hibernate.loader.Loader.getKeyFromResultSet(Loader.java:219)
  at net.sf.hibernate.loader.Loader.doFind(Loader.java:154)
  at net.sf.hibernate.loader.Loader.find(Loader.java:620)
  ...

I use the following mapping :

Code:

<class name='org.wmt.pdc.KZPContractPartner' table='WMT_KONTRAKTPARTNER'>
  <composite-id>
    <key-property name='idCp' column='ID_KV'/>
    <key-property name='numberClientWmt' column='NUM_CLIENT'/>
    <key-property name='numberMainClient' column='NUM_MAIN_CLIENT'/>
  </composite-id>
</class>

with the Java class KZPContractPartner:

Code:

private String idCp;
private String numberMainClient;
private String numberClientWmt;

with the appropriate getters and setters.

The table is defined in MySQL as

Code:

WMT_KONTRAKTPARTNER
ID_KV             DECIMAL(11,0)       PK
NUM_CLIENT  DECIMAL(11,0)       PK
NUM_MAIN_CLIENT DECIMAL(11,0) PK

Do I miss something here?

Thanks in advance.

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gavin

Post subject:

Posted: Mon Sep 08, 2003 6:48 am

Hibernate Team

Joined: Tue Aug 26, 2003 12:50 pm
Posts: 5130
Location: Melbourne, Australia

A class with an "embedded" composite id is required to implement Serializable, equals() and hashCode(). I *strongly* recommend you split out the composite id into a seperate class. It is much more elegant that way.

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