<!DOCTYPE hibernate-configuration PUBLIC

"-//Hibernate/Hibernate Configuration DTD 3.0//EN"

"http://www.hibernate.org/dtd/hibernate-configuration-3.0.dtd">

<hibernate-configuration>

<session-factory>

<property name="myeclipse.connection.profile">

OracelDriver

</property>

<property name="connection.url">

jdbc:oracle:thin:@127.0.0.1:1521:XE

</property>

<property name="connection.username">XXX</property>

<property name="connection.password">123</property>

<property name="connection.driver_class">

oracle.jdbc.driver.OracleDriver

</property>

<property name="dialect">

org.hibernate.dialect.OracleDialect

</property>

<property name="show_sql">true</property>

<property name="format_sql">true</property>

<property name="hbm2ddl.auto">update</property>

<property name="hibernate.current_session_context_class">

thread

</property>

        <mapping resource="entity/Students.hbm.xml"/>

        <mapping resource="entity/Users.hbm.xml"/>

</session-factory>

</hibernate-configuration>

你可以贴一下相应的配置文件，

NoClassDefFoundError: 一般是定义的类找不到

图片在这里

肯定是没有加载好jar包。