There is no getter for property named '**' in 'class java.lang.String

报错原因：
1.用mybatis查询时，传入一个字符串传参数，且进行判断时，会报异常
2.mapper.xml 中id值有重复的（出现原因：拷贝上面的实现，修改下参数或SQL，忘记ID值唯一的修改了）

There is no getter for property named 'moduleCode' in 'class java.lang.String  

1.错误写法：

<select id="queryAllParentModule" resultType="jobModule" prameterType="jobModule">  
select modulecode,modulename,modulevalue,linkurl,rank,       parentmodule=isnull(parentmodule,1),moduledescription   
from job_module  
<where>           
<choose>    
<when test="moduleCode!=null and moduleCode!=''">modulecode = #{moduleCode} 
</when> 
</choose>    
</where>   
</select>  

需要修改成：

<select id="queryModuleByCode" resultType="jobModule" parameterType="string">  
select modulecode, modulename,modulevalue,linkurl, rank,parentmodule=isnull(parentmodule,1),moduledescription   
from job_module  
<where>           
<choose>    
<when test="_parameter!=null and _parameter!=''">modulecode = #{_parameter}</when>    
</choose>    
</where>   
</select>  

总结：不管你的参数是什么，都要改成"_parameter"

原文地址： http://txin0814.iteye.com/blog/1533645
参考文献： http://blog.csdn.net/noku_ln10/article/details/7977976
2.改写parameter_type为 map

接口：

public List<Long> viewUidsLikeName(Map<String, Object> params);

Mapper.xml

	<select id="viewUidsLikeName" resultType="java.lang.Long"
		parameterType="java.util.Map">
		SELECT
		id
		FROM
		usr_users
		where 1=1 
		<if test="username != null">
		  and username like concat ('%','${username}','%')
		</if>
		<if test="email != null">
		  and email like concat ('%','${email}','%')
		</if>		
	</select>

注意：
1.parameterType="java.util.Map"  Map为大写，若写成map会报错
2.或直接写成map

调用：

	public List<Long> selectUidsByUsername(String username) {
		if(StringUtil.isBlank(username)){
			return null ;
		}
		Map<String, Object> params = new HashMap<String, Object>();
		if(UserUtils.isEmailAdress(username)){
			params.put("email", username);
		}else{
			params.put("username", username);
		}
		return userMapper.viewUidsLikeName(params);
	}

3.若封装在工具类中需要引用

  	<select id="selectscheduleTrackingsListPage" resultMap="BaseResultMap"
		parameterType="mybatis.utility.PageBean">
		SELECT
		<include refid="Base_Column_List" />

		from usr_merchant_schedule_tracking

		where 1 = 1

		<if test="parameter.startTime != null and parameter.startTime !=''">
			and date_format(create_time,'%Y-%m-%d') >=
			date_format(#{parameter.startTime},'%Y-%m-%d')
		</if>

		<if test="parameter.endTime != null and parameter.endTime !=''">
  				<![CDATA[ and date_format(create_time,'%Y-%m-%d') <= date_format(#{parameter.endTime},'%Y-%m-%d')  ]]>
		</if>
		
		<if test="parameter.merchantid != null and parameter.merchantid !=''">
			and  merchantid = #{parameter.merchantid,jdbcType=VARCHAR}
		</if>

	</select>

注意：
merchantid = #{parameter.merchantid,jdbcType=VARCHAR}，若为
merchantid = #{merchantid,jdbcType=VARCHAR}，就会出现上面的错误