Exception in using Hibernate

1,  java.lang.UnsupportedOperationException: The user must supply a JDBC connection

hibernate.properties vs. hibernate.cfg.xml is this:

if you use :
SessionFactory sf=new Configuration().buildSessionFactory();
then this will use the hibernate.properties

if you use:
SessionFactory sf=new Configuration().configure().buildSessionFactory();
Then this will use the hibernate.cfg.xml

another reason:hibernate.cfg.xml is in wrong configer,like this:

        <property name="driver_class">oracle.jdbc.OracleDriver</property>      
        <property name="url">url</property>
        <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
        <property name="username">username</property>
        <property name="password">password</property>


2,  org.hibernate.HibernateException: Hibernate Dialect must be explicitly set

reason:hibernate.cfg.xml is in wrong configer,like this:

        <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>      
        <property name="connection.url">url</property>
        <property name="connection.dialect">org.hibernate.dialect.Oracle9Dialect</property>
        <property name="connection.username">username</property>
        <property name="connection.password">password</property>

or this:

        <property name="connection.driver_class">oracle.jdbc.OracleDriver</property>      
        <property name="connection.url">url</property>
        <property name="dialect">org.hibernate.dialect.Oracle9Dialect</property>
        <property name="connection.username">username</property>
        <property name="connection.password">password</property>