I am getting the following error, when a call is made at 
Quote:
 session.flush() 
.
I am using Oracle9. I am not using oracle thin driver. On windows, I configure JDBC-ODBC bridge and datasource name is - test.
When, I ran following code it woked fine for me.
Code:
      Class.forName("sun.jdbc.odbc.JdbcOdbcDriver");
      Connection conn = DriverManager.getConnection ("jdbc:odbc:rmdbdatasource","scott","tiger");
Below is my configuration file.
-------------------------------------------------------------------------------------------
<hibernate-configuration>
<session-factory>
      <property name="hibernate.connection.driver_class">oracle.jdbc.driver.OracleDriver</property>
      <property name="hibernate.connection.url">jdbc:odbc:test</property>
      <property name="hibernate.connection.username">scott</property>
      <property name="hibernate.connection.password">tiger</property>
      <property name="hibernate.connection.pool_size">1</property>
      <property name="show_sql">true</property>
      <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
      <property name="hibernate.hbm2ddl.auto">update</property>
      <!-- Mapping files -->
      <mapping resource="myemp.hbm.xml"/>
</session-factory>
</hibernate-configuration>
The error
---------------------------------------------------------------------------------------------
Exception in thread "main" org.hibernate.exception.JDBCConnectionException: Cannot open connection
        at org.hibernate.exception.SQLStateConverter.convert(SQLStateConverter.java:74)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:43)
        at org.hibernate.exception.JDBCExceptionHelper.convert(JDBCExceptionHelper.java:29)
        at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:420)
        at org.hibernate.jdbc.ConnectionManager.getConnection(ConnectionManager.java:144)
        at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:93)
        at org.hibernate.jdbc.AbstractBatcher.prepareStatement(AbstractBatcher.java:86)
        at org.hibernate.jdbc.AbstractBatcher.prepareBatchStatement(AbstractBatcher.java:171)
        at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2048)
        at org.hibernate.persister.entity.AbstractEntityPersister.insert(AbstractEntityPersister.java:2427)
        at org.hibernate.action.EntityInsertAction.execute(EntityInsertAction.java:51)
        at org.hibernate.engine.ActionQueue.execute(ActionQueue.java:248)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:232)
        at org.hibernate.engine.ActionQueue.executeActions(ActionQueue.java:139)
        at org.hibernate.event.def.AbstractFlushingEventListener.performExecutions(AbstractFlushingEventListener.java:29
7)
        at org.hibernate.event.def.DefaultFlushEventListener.onFlush(DefaultFlushEventListener.java:27)
        at org.hibernate.impl.SessionImpl.flush(SessionImpl.java:985)
        at roseindia.tutorial.hibernate.FirstExample.main(FirstExample.java:41)
Caused by: java.sql.SQLException: No suitable driver
        at java.sql.DriverManager.getConnection(DriverManager.java:545)
        at java.sql.DriverManager.getConnection(DriverManager.java:140)
        at org.hibernate.connection.DriverManagerConnectionProvider.getConnection(DriverManagerConnectionProvider.java:1
10)
        at org.hibernate.jdbc.ConnectionManager.openConnection(ConnectionManager.java:417)
        ... 14 more[/code]