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Hibernate version:2.1.2
Hello forum Members
I have typed prepared the following program to try an approach for linking 2 tables.
Table User has 2 columns Id and Key
Table Name has 3 columns Id, firstName and lastName.
User.Id is primary key
User.Key is integer with auto_increment.
The objective is :
When the value in the User.Id is saved, the Key is auto incremented.
The Name table is not being used at present.
When trying to run the launcher program -> example, I get an error stating "No Persister for pac.User"
Database used is MySQL.
This is a stand-alone application.
I will appreciate any pointer regarding the error/changes required in the code.
Thanks.
regards,
Amitabh.
=============================================================================================
The following is content of hibernte.cfg.xml.
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration
PUBLIC "-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-2.0.dtd">
<hibernate-configuration>
<!-- <session-factory name="java:comp/env/hibernate/SessionFactory"> -->
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/example</property>
<property name="hibernate.connection.username">user</property>
<property name="hibernate.connection.password">password</property>
<property name="hibernate.connection.pool_size">4</property>
<property name="hibernate.dialect">net.sf.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.show_sql">true</property>
<!-- Mapping files -->
<mapping resource="pac/User.hbm.xml"/>
<mapping resource="pac/Name.hbm.xml"/>
</session-factory>
</hibernate-configuration>
The Java Source code is :
=======
pac.User.java
--
package pac;
public class User{
private String userId = null;
private String key = null;
public User(){
}
public String getId(){
return userId;
}
public void setId(String userId){
this.userId = userId;
}
public String getKey(){
return key;
}
}
======
======
pac.Name.java
---
package pac;
public class Name{
private String keyId = null;
private String firstName = null;
private String lastName = null;
public Name(){
}
public String getKeyId(){
return keyId;
}
public void setKeyId(String keyId){
this.keyId = keyId;
}
public String getFirstName(){
return firstName;
}
public void setFristName(String firstName){
this.firstName = firstName;
}
public String getLastName(){
return lastName;
}
public void setLastName(String lastName){
this.lastName = lastName;
}
}
======
The content of hbm files
======
pac/User.hbm.xml
----
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping package="pac">
<class name="User" table="USER">
<id name="id" column="Id">
<generator class="native"/>
</id>
<property name="key" column="Key"/>
</class>
</hibernate-mapping>
======
======
pac/Name.hbm.xml
----
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-mapping
PUBLIC "-//Hibernate/Hibernate Mapping DTD//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd">
<hibernate-mapping package="pac">
<class name="Name" table="name">
<id name="id">
<generator class="native"/>
</id>
<property name="firstName"/>
<property name="lastName"/>
<one-to-one name="user" class="User" property-ref="key"/>
</class>
</hibernate-mapping>
======
The Source code of the Launcher class is given below.
======
example.java
----
import net.sf.hibernate.*;
import net.sf.hibernate.cfg.*;
import java.io.*;
import java.sql.*;
import pac.User;
import pac.Name;
public class example{
private static String firstName = null;
private static String lastName = null;
private static BufferedReader reader = null;
private static SessionFactory sessionFactory = null;
Connection connection=null;
static{
try{
Class.forName("com.mysql.jdbc.Driver");
sessionFactory = new Configuration().buildSessionFactory();
}catch(Exception exception){
exception.printStackTrace();
}
}
public static final ThreadLocal session = new ThreadLocal();
private void openJdbcConnection() throws SQLException{
connection = DriverManager.getConnection("jdbc:mysql://localhost:3306/example", "krishan","krishan");
}
private Session openSession() throws HibernateException {
Session open = (Session) session.get();
if(open == null){
open = sessionFactory.openSession();
session.set(open);
}
return open;
}
private void closeSession() throws HibernateException {
Session close = (Session) session.get();
session.set(null);
if(close != null){
close.close();
}
}
private void persist() throws HibernateException{
Session session = openSession();
User user = new User();
session.save(user);
session.flush();
closeSession();
}
public static void main(String[] args) throws Exception{
new example().persist();
reader = new BufferedReader(new InputStreamReader(System.in));
System.out.print("Enter the First Name : ");
firstName = reader.readLine();
System.out.print("Enter the Last Name : ");
lastName = reader.readLine();
}
}
======
The error message
===========
20:51:25,044 INFO Environment:462 - Hibernate 2.1.2
20:51:25,054 INFO Environment:491 - hibernate.properties not found
20:51:25,064 INFO Environment:519 - using CGLIB reflection optimizer
20:51:25,084 INFO Configuration:595 - processing one-to-many association mappings
20:51:25,084 INFO Configuration:604 - processing one-to-one association property references
20:51:25,084 INFO Configuration:629 - processing foreign key constraints
20:51:25,144 WARN SettingsFactory:50 - No dialect set - using GenericDialect: The dialect was not set. Set the property hibernate.dialect.
20:51:25,154 INFO Dialect:82 - Using dialect: net.sf.hibernate.dialect.GenericDialect
20:51:25,154 INFO SettingsFactory:62 - Use outer join fetching: false
20:51:25,164 WARN UserSuppliedConnectionProvider:25 - No connection properties specified - the user must supply JDBC connections
20:51:25,184 INFO TransactionManagerLookupFactory:33 - No TransactionManagerLookup configured (in JTA environment, use of process level read-write cache is not recommended)
20:51:25,184 INFO SettingsFactory:102 - Use scrollable result sets: false
20:51:25,184 INFO SettingsFactory:105 - Use JDBC3 getGeneratedKeys(): false
20:51:25,184 INFO SettingsFactory:108 - Optimize cache for minimal puts: false
20:51:25,194 INFO SettingsFactory:117 - Query language substitutions: {}
20:51:25,194 INFO SettingsFactory:128 - cache provider: net.sf.ehcache.hibernate.Provider
20:51:25,254 INFO Configuration:1080 - instantiating and configuring caches
20:51:26,666 INFO SessionFactoryImpl:119 - building session factory
20:51:27,097 INFO SessionFactoryObjectFactory:82 - no JNDI name configured
Exception in thread "main" net.sf.hibernate.MappingException: No persister for:
pac.User
at net.sf.hibernate.impl.SessionFactoryImpl.getPersister(SessionFactoryImpl.java:344)
at net.sf.hibernate.impl.SessionImpl.getClassPersister(SessionImpl.java:2656)
at net.sf.hibernate.impl.SessionImpl.getPersister(SessionImpl.java:2663)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:745)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:720)
at example.persist(example.java:54)
at example.main(example.java:60)
==========
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