错误有关问题求高手解决！

 <property name="contentdetail" type="org.springframework.orm.hibernate3.support.ClobStringType">            <column name="CONTENTDETAIL" not-null="true" /> </property>

<?xml version="1.0" encoding="UTF-8"?><beans xmlns="http://www.springframework.org/schema/beans"    xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"    xmlns:tx="http://www.springframework.org/schema/tx"    xmlns:aop="http://www.springframework.org/schema/aop"    xsi:schemaLocation="http://www.springframework.org/schema/beans   http://www.springframework.org/schema/beans/spring-beans-2.0.xsd     http://www.springframework.org/schema/tx  http://www.springframework.org/schema/tx/spring-tx-2.0.xsd     http://www.springframework.org/schema/aop   http://www.springframework.org/schema/aop/spring-aop-2.0.xsd"    default-autowire="byName">    <!-- 注入 -->    <bean id="oracleLobHandler" class="org.springframework.jdbc.support.lob.OracleLobHandler">        <property name="nativeJdbcExtractor"><ref local="nativeJdbcExtractor"/></property>    </bean>    <bean id="nativeJdbcExtractor" class="org.springframework.jdbc.support.nativejdbc.CommonsDbcpNativeJdbcExtractor">    </bean>        <bean id="dataSource"        class="org.apache.commons.dbcp.BasicDataSource">        <property name="driverClassName"            value="oracle.jdbc.driver.OracleDriver">        </property>        <property name="url"            value="jdbc:oracle:thin:@192.168.168.227:1521:orcl">        </property>        <property name="username" value="pdyg"></property>        <property name="password" value="pdyg"></property>    </bean>    <bean id="sessionFactory"        class="org.springframework.orm.hibernate3.LocalSessionFactoryBean">                <property name="dataSource">            <ref bean="dataSource" />        </property>        <!-- 引用 -->        <property name="lobHandler">               <ref bean="oracleLobHandler" />          </property>                 <property name="hibernateProperties">            <props>                <prop key="hibernate.dialect">                    org.hibernate.dialect.Oracle9Dialect                </prop>                <prop key="hibernate.show_sql">                true                </prop>                <prop key="hibernate.format_sql">                true                </prop>                <prop key="current_session_context_class">true</prop>                <prop key="hibernate.connection.SetBigStringTryClob"></prop>                <prop key="hibernate.jdbc.batch_size">0</prop>             </props>        </property>                    <property name="mappingResources">            <list>                <value>com/bsth/pdyg/domain/Friendlink.hbm.xml</value>                <value>com/bsth/pdyg/domain/Userinfo.hbm.xml</value>                <value>com/bsth/pdyg/domain/Contentinfo.hbm.xml</value>                <value>com/bsth/pdyg/domain/Filemanager.hbm.xml</value>                <value>com/bsth/pdyg/domain/Email.hbm.xml</value></list>        </property>    </bean>    <bean id="txManager"        class="org.springframework.orm.hibernate3.HibernateTransactionManager">        <property name="sessionFactory" ref="sessionFactory" />    </bean>    <tx:advice id="txAdvice" transaction-manager="txManager">        <tx:attributes>            <tx:method name="get*" read-only="true" />            <tx:method name="*" propagation="REQUIRED" />        </tx:attributes>    </tx:advice>    <aop:config>        <aop:pointcut id="serviceMethod"            expression="execution(* com.bsth.pdyg.service.*.*(..))" />        <aop:advisor pointcut-ref="serviceMethod" advice-ref="txAdvice" />    </aop:config>        <!-- 导入 -->    <import resource="frontend.xml"/>    <import resource="backend.xml"/>    </beans>