Error querying database. Cause: org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'id' in 'class java.lang.Integer'
报错原因：
<select id="selectUser" parameterType="int" resultType="User">
select * from user
where
<if test=" id != null ">id = #{id}</if>
</select>
修改代码：
<select id="selectUser" parameterType="int" resultType="User">
select * from user where id=#{id}
</select>
或者
<select id="selectUser" parameterType="int" resultType="User">
select * from user where
<if test=" _parameter != null ">id = #{_parameter}</if>
</select>
引起原因，网上说是：
Mybatis默认采用ONGL解析参数，所以会自动采用对象树的形式取Integer.id值，引起报错
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