java.lang.NoClassDefFoundError: org/hibernate/Session
<property name="dialect">org.hibernate.dialect.Oracle10gDialect</property>
<property name="connection.driver_class">oracle.jdbc.OracleDriver</property>
<property name="connection.url">jdbc:oracle:thin:@10.16.10.81:1521:orcl</property>
<property name="connection.username">subrat</property>
<property name="connection.password">subrat</property>

<property name="cache.provider_class">org.hibernate.cache.HashtableCacheProvider</property>

<property name="transaction.factory_class">org.hibernate.transaction.JDBCTransactionFactory</property>
<property name="current_session_context_class">thread</property>
<property name="hibernate.show_sql">false</property>

<!-- Mapping files -->
<mapping resource="hbm/user.hbm.xml"/>