Hibernate won't insert into database - mysql

Question

Now I have a really strange problem which I'm unable to understand.
I've got hibernate properly configured. I can load data from my mysql database without any problems. But I'm not able to insert data. Here is my hibernate.cfg.xml:
<?xml version='1.0' encoding='utf-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
"-//Hibernate/Hibernate Configuration DTD//EN"
"http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<hibernate-configuration>
<session-factory>
<property name="hibernate.connection.driver_class">com.mysql.jdbc.Driver</property>
<property name="hibernate.connection.url">jdbc:mysql://localhost:3306/bookmaker</property>
<property name="hibernate.connection.username">root</property>
<property name="hibernate.connection.password">password</property>
<property name="hibernate.connection.pool_size">10</property>
<property name="show_sql">true</property>
<property name="dialect">org.hibernate.dialect.MySQLDialect</property>
<property name="hibernate.current_session_context_class">thread</property>
<property name="javax.persistence.validation.mode">none</property>
<mapping class="de.wettprofi.objects.Bookmaker"/>
<mapping class="de.wettprofi.objects.Match"/>
<mapping class="de.wettprofi.objects.LogEntry"/>
</session-factory>
</hibernate-configuration>
It's about the class LogEntry. Here is some code that should persit the object into the database:
public void doPost( HttpServletRequest request, HttpServletResponse response ) throws ServletException, IOException
{
BufferedReader reader = request.getReader();
String json = reader.readLine();
try {
LogEntry log_entry = null;
if (json != null && !json.isEmpty()) {
log_entry = new LogEntry();
JSONParser parser = new JSONParser();
JSONObject json_dict = (JSONObject) parser.parse( json );
//initalize proper LogEntry object
}
if( log_entry != null ) {
Session session = get_hibernate_session();
System.out.println("Logging of LogEntry into the database\n" + log_entry.toString() );
session.save( log_entry );
session.flush();
System.out.println("Logging DONE");
}
} catch( Exception e ) {
e.printStackTrace();
}
}
public Session get_hibernate_session()
{
//Opening a hibernate session
SessionFactory sessionFactory = null;
try {
Configuration hibConfiguration = new Configuration().addResource("hibernate.cfg.xml").configure();
ServiceRegistry serviceRegistry = new ServiceRegistryBuilder().applySettings(hibConfiguration.getProperties()).buildServiceRegistry();
sessionFactory = hibConfiguration.buildSessionFactory(serviceRegistry);
} catch( Exception e ) {
e.printStackTrace();
}
return sessionFactory.withOptions().openSession();
}
And this is what the LogEntry class object looks like (getters and setters omitted):
#Entity
#Table( name = "LogEntries" )
public class LogEntry {
public static int MESSAGE = 1;
public static int BOOKMAKER = 2;
public static int CLICKLOG = 3;
#Id
#GeneratedValue(strategy=GenerationType.AUTO)
#Column( name = "lid" )
public int lid;
#Column( name = "id" )
public String id;
#Column( name = "date" )
public Date date;
#Column( name = "type" )
public int type;
#Column( name = "message" )
public String message;
#Column( name = "bookmaker" )
public String bookmaker;
#Column( name = "match_id" )
public int match_id;
#Column( name = "result" )
public String result;
public String toString()
{
StringBuffer sb = new StringBuffer();
sb.append(" lid = " + lid + "\n");
sb.append(" id = " + id + "\n");
sb.append(" date = " + date.toString() + "\n");
sb.append(" type = " + type + "\n");
sb.append(" message = " + message + "\n");
sb.append("bookmaker = " + bookmaker + "\n");
sb.append(" match_id = " + match_id + "\n");
sb.append(" result = " + result + "\n");
return sb.toString();
}
So, when I now run my tomcat instance and have a look on what did happen I get the following output:
INFO: HHH000400: Using dialect: org.hibernate.dialect.MySQLDialect
Apr 24, 2013 9:55:18 PM org.hibernate.engine.transaction.internal.TransactionFactoryInitiator initiateService
INFO: HHH000399: Using default transaction strategy (direct JDBC transactions)
Apr 24, 2013 9:55:18 PM org.hibernate.hql.internal.ast.ASTQueryTranslatorFactory <init>
INFO: HHH000397: Using ASTQueryTranslatorFactory
Logging of LogEntry into the database
lid = 0
id = 50569803719166097161
date = Mon Apr 22 21:01:53 CEST 2013
type = 1
message = MainVC
bookmaker = null
match_id = 0
result = null
Hibernate: insert into LogEntries (bookmaker, date, id, match_id, message, result, type) values (?, ?, ?, ?, ?, ?, ?)
Logging DONE
However after this having a look into my database reveals that nothing has been written to the table.
This is my table schema:
mysql> describe LogEntries;
+-----------+--------------+------+-----+---------+----------------+
| Field | Type | Null | Key | Default | Extra |
+-----------+--------------+------+-----+---------+----------------+
| lid | int(11) | NO | PRI | NULL | auto_increment |
| bookmaker | varchar(255) | YES | | NULL | |
| date | datetime | YES | | NULL | |
| id | varchar(255) | YES | | NULL | |
| match_id | int(11) | YES | | NULL | |
| message | varchar(255) | YES | | NULL | |
| result | varchar(255) | YES | | NULL | |
| type | int(11) | YES | | NULL | |
+-----------+--------------+------+-----+---------+----------------+
8 rows in set (0.00 sec)
Has anybody got an idea what might cause this trouble. I'm clueless :(

Answer 1

The entity class should have getter and setter for the property.
As well after you are getting session, you need to begin your transaction.
http://docs.jboss.org/hibernate/orm/3.5/javadoc/org/hibernate/Session.html
Session sess = factory.openSession();
Transaction tx;
try {
tx = sess.beginTransaction();
//do some work
...
sess.save(entityObjectToBeinserted);
tx.commit();
}
catch (Exception e) {
if (tx!=null) tx.rollback();
throw e;
}
finally {
sess.close();
}

Answer 2

You need to declare get/set pairs for every property per the Hibernate documentation. These methods can be public, protected or private, but they must be present.