mybatis 插入null 时需要指定jdbcType

MyBatis 插入空值时，需要指定JdbcType 
mybatis insert空值报空值异常，但是在pl/sql不会提示错误，主要原因是mybatis无法进行转换

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<insert id="insertInstrument" parameterType="com.labway.oa.po.Instruments">     insert into     instruments     (group_name,     name,     description,     on_line,     operator,     x_sbxh,     serial_no,     x_lc,     x_sbjd,     vendor,     <!-- x_sbsx, -->     location,     changed_on,     changed_by,     removed,     low_threshold,     high_threshold,     stability_delta,     stability_number,     port_number,     discard_time,     size_limit,     time_out,     polling_time,     needs_calibration,     needs_pm,     holds_samples,     include_subdirs,     debug,     store_in_db_file,     db_file_prompt,     x_jlsx,     x_funcheck_status,     x_timecheck_status,     x_name,     x_description,     x_funcheck_date,     x_timecheck_date,     pm_date,     x_pm_status,     x_status,     x_group_name         ) values(     #{group_name,jdbcType=VARCHAR},     #{name,jdbcType=VARCHAR},     #{description,jdbcType=VARCHAR},     #{on_line,jdbcType=VARCHAR},     #{operator,jdbcType=VARCHAR},     #{x_sbxh,jdbcType=VARCHAR},     #{serial_no,jdbcType=VARCHAR},     #{x_lc,jdbcType=VARCHAR},     #{x_sbjd,jdbcType=VARCHAR},     #{vendor,jdbcType=VARCHAR},     <!-- #{x_sbsx}, -->     #{location,jdbcType=VARCHAR},     #{changed_on,javaType=String,jdbcType=DATE,typeHandler=com.labway.portal.handler.LwDateTypeHandler},     #{changed_by,jdbcType=VARCHAR},     'F',     '0',     '0',     '0',     '0',     '0',     '0',     '0',     '0',     '0',     'F',     'F',     'F',     'F',     'F',     'F',     'F',     'T',     'F',     'F',     #{name,jdbcType=VARCHAR},     #{description,jdbcType=VARCHAR},     #{x_funcheck_date,javaType=String,jdbcType=DATE,typeHandler=com.labway.portal.handler.LwDateTypeHandler},     #{x_timecheck_date,javaType=String,jdbcType=DATE,typeHandler=com.labway.portal.handler.LwDateTypeHandler},     #{pm_date,javaType=String,jdbcType=DATE,typeHandler=com.labway.portal.handler.LwDateTypeHandler},     #{x_pm_status,jdbcType=VARCHAR},     #{x_status,jdbcType=VARCHAR},     #{x_group_name,jdbcType=VARCHAR}     ) </insert>