mybatis一个怪异的问题: Invalid bound statement (not found)

Invalid bound statement (not found): cn.com.dao.UserDao.selectByUser
at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:178)
at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:38)
at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:49)
at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:42)
at $Proxy22.selectByUser(Unknown Source)

Caused by: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for cn.com.dao.UserDao.selectByUser

at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:775)
at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:615)
at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:608)
at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:176)

... 34 more

我检查了半天也没看出什么问题来，后来把mapper的xml select 语句重写。问题竟然好了。

出了这种问题：

1.

<mapper namespace="cn.com.dao.UserDao">

mapper的namespace写的不对！

2.

UserDao的方法在UserDao.xml中没有，然后执行UserDao的方法会报此错

3. 删除配置文件里中文的注释,保存.

4. 如果你确认没有以上问题,请任意修改下对应的xml文件,比如删除一个空行,保存.问题解决...