org.hibernate.MappingException: Unknown entity: java.lang.String

<?xml version='1.0' encoding='UTF-8'?>
<!DOCTYPE hibernate-configuration PUBLIC
          "-//Hibernate/Hibernate Configuration DTD 3.0//EN"
          "http://hibernate.sourceforge.net/hibernate-configuration-3.0.dtd">
<!-- Generated by MyEclipse Hibernate Tools. -->
<hibernate-configuration>
<session-factory>
 <property name="connection.driver_class">com.mysql.jdbc.Driver</property>
 <property name="connection.url">
  jdbc:mysql://localhost:3306/finance
 </property>
 <property name="connection.username">root</property>
 <property name="connection.password">root</property>
 <!-- SQL方言，这边设定的是MySQL -->
 <property name="dialect">
  org.hibernate.dialect.MySQLDialect
 </property>
 <property name="show_sql">true</property>
 <!-- Drop and re-create the database schema on startup-->
 <property name="hbm2ddl.auto">update</property>
 <property name="myeclipse.connection.profile">MySqlJ</property>
 <!-- 映射文件-->
 <mapping resource="fin/FinEntity.hbm.xml" />
</session-factory>
</hibernate-configuration>FinEntity.hbm.xml
<?xml version="1.0" encoding="utf-8"?>
<!DOCTYPE hibernate-mapping PUBLIC "-//Hibernate/Hibernate Mapping DTD 3.0//EN"
"http://hibernate.sourceforge.net/hibernate-mapping-3.0.dtd">
<!-- 
    Mapping file autogenerated by MyEclipse Persistence Tools
-->
<hibernate-mapping>
    <class name="fin.FinEntity" table="finentity" catalog="finance">
        <id name="fin_id" type="java.lang.Integer">
            <column name="fin_id" />
            <generator class="identity" />
        </id>
    </class>
    <property name="fin_type" type="java.lang.String">
            <column name="fin_type" length="8" not-null="true" />
    </property>
</hibernate-mapping>
错误信息org.hibernate.MappingException: Unknown entity: java.lang.String
 at org.hibernate.impl.SessionFactoryImpl.getEntityPersister(SessionFactoryImpl.java:550)
 at org.hibernate.impl.SessionImpl.getEntityPersister(SessionImpl.java:1338)
 at org.hibernate.engine.ForeignKeys.isTransient(ForeignKeys.java:180)