mybatis 大字段问题处理

org.springframework.jdbc.UncategorizedSQLException: 
### Error updating database.  Cause: java.sql.SQLException: ORA-01461: 仅能绑定要插入 LONG 列的 LONG 值

### The error may involve com.extr.persistence.ExamPaperMapper.insertExamPaper-Inline
### The error occurred while setting parameters
### SQL: insert into et_exam_paper (id,name,content,duration,pass_point,total_point,status,summary,is_visible,answer_sheet,group_id,   is_subjective,creator,paper_type,field_id)   values   (?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?,   ?   )
### Cause: java.sql.SQLException: ORA-01461: 仅能绑定要插入 LONG 列的 LONG 值

protected Object content;

id="myMapper" type="org.zz.ExamPaper">   
    <result property="id" column="id" jdbcType="VARCHAR"/>
    <result property="content" column="content" jdbcType="CLOB" javaType = "java.lang.String" typeHandler ="org.service.OracleClobTypeHandler"/>
    <result property="duration" column="duration" jdbcType="INTEGER"/>
    <result property="create_time" column="create_time" jdbcType="DATE" javaType="java.util.Date"/>

import java.sql.CallableStatement;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;

import oracle.sql.CLOB;

import org.apache.ibatis.type.JdbcType;
import org.apache.ibatis.type.TypeHandler;

public class OracleClobTypeHandler implements TypeHandler