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Hibernate ver 3.2.

[b] Bean :-
package myhibernate;

class Mmm implements java.io.Serializable
{
private String msg;
private int id;
public Mmm()
{
id = 0;
}

public void setMsg(String aMessage)
{
msg = aMessage;
}
public String getMsg()
{
return msg;
}
public void setId(int aID)
{
id = aID;
}

public int getId()
{
return id;
}
}

Configuration:-
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
<property name="hibernate.connection.url">jdbc:oracle:oci8:@syntera</property>
<property name="hibernate.connection.username">syntera</property>
<property name="hibernate.connection.password">syntera</property>
<property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
<property name="hibernate.default_entity_mode">dynamic-map</property>
<property name="jdbc.batch_size">0</property>
<property name="show_sql">true</property>


<!-- Mapping files -->
<mapping resource="Mmm.hbm.xml"/>

</session-factory>
</hibernate-configuration>

Mapping:-

<hibernate-mapping>
<class name="myhibernate.Mmm" table="MESSAGE" schema="SYNTERA">
<composite-id name="id" class="myhibernate.Mmm">
<key-property name="id" type="int">
<column name="MESSAGE_ID" />
</key-property>
<key-property name="msg" type="string">
<column name="MESSAGE" length="100" />
</key-property>
</composite-id>
</class>
</hibernate-mapping>



[b]Code between sessionFactory.openSession() and session.close():
Mmm msg = new Mmm();
msg.setId(new Long(12));
msg.setMsg("Message1");

session.save(msg);
session.flush();
session.close();

[b]Full stack trace of any exception that occurs
java.lang.ClassCastException: myhibernate.Mmm
at org.hibernate.property.MapAccessor$MapGetter.get(MapAccessor.java:67)

at org.hibernate.tuple.entity.AbstractEntityTuplizer.getIdentifier(Abstr
actEntityTuplizer.java:183)
at org.hibernate.persister.entity.AbstractEntityPersister.getIdentifier(
AbstractEntityPersister.java:3591)
at org.hibernate.id.Assigned.generate(Assigned.java:28)
at org.hibernate.event.def.AbstractSaveEventListener.saveWithGeneratedId
(AbstractSaveEventListener.java:99)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.saveWithGene
ratedOrRequestedId(DefaultSaveOrUpdateEventListener.java:187)
at org.hibernate.event.def.DefaultSaveEventListener.saveWithGeneratedOrR
equestedId(DefaultSaveEventListener.java:33)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.entityIsTran
sient(DefaultSaveOrUpdateEventListener.java:172)
at org.hibernate.event.def.DefaultSaveEventListener.performSaveOrUpdate(
DefaultSaveEventListener.java:27)
at org.hibernate.event.def.DefaultSaveOrUpdateEventListener.onSaveOrUpda
te(DefaultSaveOrUpdateEventListener.java:70)
at org.hibernate.impl.SessionImpl.fireSave(SessionImpl.java:535)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:523)
at org.hibernate.impl.SessionImpl.save(SessionImpl.java:519)
at myhibernate.CreateMessage.main(CreateMessage.java:24)
myhibernate.Mmm

[b]Name and version of the database you are using:- Oracle 10g

[b]The generated SQL (show_sql=true):

i am new to hibernate please tell me the problem


Problems with Session and transaction handling?

Read this: http://hibernate.org/42.html

Remove the class attribute from composite-id tag and see if it works.



Farzad-

i tried with the following mapping file , but still showing the same exception.

<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<hibernate-mapping>
<class name="myhibernate.Mmm" table="MESSAGE">
<id name="msg" type="string" column="MESSAGE">
<generator class="assigned"/>
</id>
<property name="id" type="int" column="MESSAGE_ID"/>
</class>
</hibernate-mapping>

please tell me the solution.

Sorry. I was blind not to see you have set default_entity_mode to maps but you are passing a POJO. Removing that line from the config file might solve the problem. Let me know if you run into another one.


Farzad-

Farzad,

it is wrking , Thank you , Thank you ,..... i am soooo happpy.


Apparao.