Hibernate version:
2.1.6
Mapping documents:
<?xml version="1.0"?>
<!DOCTYPE hibernate-mapping PUBLIC
"-//Hibernate/Hibernate Mapping DTD 2.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-2.0.dtd" >
<!-- DO NOT EDIT: This is a generated file that is synchronized -->
<!-- by MyEclipse Hibernate tool integration. -->
<!-- Created Thu Sep 02 11:08:29 BST 2004 -->
<hibernate-mapping package="co.uk.fastest.foi.hibernate">
<class name="Users" table="Users">
<id name="usersId" column="users_id" type="java.lang.String">
<generator class="native"/>
</id>
<property name="usersUsername" column="users_username" type="java.lang.String" not-null="true" />
<property name="usersPassword" column="users_password" type="java.lang.String" not-null="true" />
<property name="usersLevel" column="users_level" type="java.lang.String" not-null="true" />
<property name="usersEmail" column="users_email" type="java.lang.String" not-null="true" />
<property name="usersDepartment" column="users_department" type="java.lang.String" not-null="true" />
<property name="usersTitle" column="users_title" type="java.lang.String" not-null="true" />
<property name="usersJobTitle" column="users_job_title" type="java.lang.String" />
<property name="usersFirstName" column="users_first_name" type="java.lang.String" not-null="true" />
<property name="usersInitials" column="users_initials" type="java.lang.String" not-null="true" />
<property name="usersSurname" column="users_surname" type="java.lang.String" not-null="true" />
<property name="usersTelephone" column="users_telephone" type="java.lang.String" not-null="true" />
<property name="usersGenPassword" column="users_gen_password" type="java.lang.String" not-null="true" />
<property name="usersLastLogin" column="users_last_login" type="java.util.Date" />
</class>
</hibernate-mapping>
drop table if exists Users;
create table Users
(
users_id int unsigned not null primary key,
users_username varchar(10) not null,
users_password varchar(10) not null,
users_level int unsigned not null,
users_email varchar(125) not null,
users_department varchar(50) not null,
users_title varchar(5) not null,
users_job_title varchar(100),
users_first_name varchar(25) not null,
users_initials varchar(5) not null,
users_surname varchar(25) not null,
users_telephone bigint unsigned not null,
users_gen_password varchar(10) not null,
users_last_login date
);
<hibernate-configuration>
<session-factory>
<!-- properties -->
<property name="connection.username">rbbh</property>
<property name="connection.url">jdbc:mysql://localhost:3306/rbbh_freedom</property>
<property name="dialect">net.sf.hibernate.dialect.MySQLDialect</property>
<property name="connection.password">battle</property>
<property name="connection.driver_class">com.mysql.jdbc.Driver</property>
<!-- mapping files -->
<mapping resource="co/uk/fastest/foi/hibernate/Users.hbm.xml"/>
</session-factory>
</hibernate-configuration>
Code between sessionFactory.openSession() and session.close():
package co.uk.fastest.foi.hibernate;
import net.sf.hibernate.HibernateException;
import net.sf.hibernate.Session;
import net.sf.hibernate.cfg.Configuration;
/**
* Configures and provides access to Hibernate sessions, tied to the
* current thread of execution. Follows the Thread Local Session
* pattern, see {@link
http://hibernate.org/42.html}.
*/
public class HibernateSessionFactory {
/**
* Location of hibernate.cfg.xml file.
* NOTICE: Location should be on the classpath as Hibernate uses
* #resourceAsStream style lookup for its configuration file. That
* is place the config file in a Java package - the default location
* is the default Java package.<br><br>
* Examples: <br>
* <code>CONFIG_FILE_LOCATION = "/hibernate.conf.xml".
* CONFIG_FILE_LOCATION = "/com/foo/bar/myhiberstuff.conf.xml".</code>
*/
private static String CONFIG_FILE_LOCATION = "/hibernate.cfg.xml";
/** Holds a single instance of Session */
private static final ThreadLocal threadLocal = new ThreadLocal();
/** The single instance of hibernate configuration */
private static final Configuration cfg = new Configuration();
/** The single instance of hibernate SessionFactory */
private static net.sf.hibernate.SessionFactory sessionFactory;
/**
* Returns the ThreadLocal Session instance. Lazy initialize
* the <code>SessionFactory</code> if needed.
*
* @return Session
* @throws HibernateException
*/
public static Session currentSession() throws HibernateException {
Session session = (Session) threadLocal.get();
if (session == null) {
if (sessionFactory == null) {
try {
cfg.configure(CONFIG_FILE_LOCATION);
sessionFactory = cfg.buildSessionFactory();
}
catch (Exception e) {
System.err.println("%%%% Error Creating SessionFactory %%%%");
e.printStackTrace();
}
}
session = sessionFactory.openSession();
threadLocal.set(session);
}
return session;
}
/**
* Close the single hibernate session instance.
*
* @throws HibernateException
*/
public static void closeSession() throws HibernateException {
Session session = (Session) threadLocal.get();
threadLocal.set(null);
if (session != null) {
session.close();
}
}
/**
* Default constructor.
*/
private HibernateSessionFactory() {
}
}
public void addUsers ( Users user ) { // start of the addUsers method
// Create the insance that will be the database session
Session session = null;
try { // start of the try statement
session = HibernateSessionFactory.currentSession();
session.save(user);
session.flush();
} // end of the try statement
catch ( HibernateException e ) { // start of the catch exception
throw new RuntimeException ( e );
} // end of the catch exception
finally { // start of the finally statement
if ( session != null ) { // start of if statement
try { // start of the try statement
session.close ( );
} // end of the try statement
catch ( HibernateException e ) { // start of the catch statement
throw new RuntimeException ( e );
} // end of the catch statement
} // end of the if statement
} // end of the finally statement
} // end of the addUsers method
Full stack trace of any exception that occurs:
The first time it is run
log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.RuntimeException: net.sf.hibernate.HibernateException: The database returned no natively generated identity value
at co.uk.fastest.foi.hibernate.Database.addUsers(Database.java:162)
at Application.<init>(Application.java:36)
at Application.main(Application.java:48)
Caused by: net.sf.hibernate.HibernateException: The database returned no natively generated identity value
at net.sf.hibernate.persister.AbstractEntityPersister.getGeneratedIdentity(AbstractEntityPersister.java:1230)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:530)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:432)
at net.sf.hibernate.impl.ScheduledIdentityInsertion.execute(ScheduledIdentityInsertion.java:29)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:932)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:857)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:775)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:738)
at co.uk.fastest.foi.hibernate.Database.addUsers(Database.java:155)
... 2 more
The second time it is run
log4j:WARN No appenders could be found for logger (net.sf.hibernate.cfg.Environment).
log4j:WARN Please initialize the log4j system properly.
Exception in thread "main" java.lang.RuntimeException: net.sf.hibernate.JDBCException: could not insert: [co.uk.fastest.foi.hibernate.Users]
at co.uk.fastest.foi.hibernate.Database.addUsers(Database.java:162)
at Application.<init>(Application.java:36)
at Application.main(Application.java:48)
Caused by: net.sf.hibernate.JDBCException: could not insert: [co.uk.fastest.foi.hibernate.Users]
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:558)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:432)
at net.sf.hibernate.impl.ScheduledIdentityInsertion.execute(ScheduledIdentityInsertion.java:29)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:932)
at net.sf.hibernate.impl.SessionImpl.doSave(SessionImpl.java:857)
at net.sf.hibernate.impl.SessionImpl.saveWithGeneratedIdentifier(SessionImpl.java:775)
at net.sf.hibernate.impl.SessionImpl.save(SessionImpl.java:738)
at co.uk.fastest.foi.hibernate.Database.addUsers(Database.java:155)
... 2 more
Caused by: java.sql.SQLException: Duplicate key or integrity constraint violation, message from server: "Duplicate entry '0' for key 1"
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:1977)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:1163)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:1272)
at com.mysql.jdbc.Connection.execSQL(Connection.java:2236)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1741)
at com.mysql.jdbc.PreparedStatement.executeUpdate(PreparedStatement.java:1588)
at net.sf.hibernate.persister.EntityPersister.insert(EntityPersister.java:528)
... 9 more
Name and version of the database you are using:
MySQL normal 4.0.20
This is really odd as it does add the object to the database and then throws an error, and then when you call the code again the error is in generating a primary key, here is the code i called.
public class Application {
public Application () {
Users user = new Users();
user.setUsersDepartment("programming");
user.setUsersEmail("tom.malone@fastest.org.uk");
user.setUsersFirstName("thomas");
user.setUsersGenPassword("password");
user.setUsersInitials("tjm");
user.setUsersJobTitle("programmer");
user.setUsersLevel("1");
user.setUsersPassword("liverpool");
user.setUsersSurname("malone");
user.setUsersTelephone("01635254795");
user.setUsersTitle("tjm");
user.setUsersUsername("fred");
Database.getInstance().addUsers(user);
System.out.println("set the user to null");
user = null;
user = Database.getInstance().getUsers("tom");
System.out.println(user.getUsersDepartment());
}
public static void main ( String args[] ) {
new Application ( );
}
}
So why are these two errors called, sorry if this is blindingly obvious i am really stuck any suggestions or help would be greattly appreciated.
Tom
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