这个错误主要原因是：数据库的配置出问题，比如写错库名什么的，仔细检查下。
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HTTP Status 500 - org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.PersistenceException:
错误：严重: Servlet.service() for servlet [appServlet] in context with path [] threw exception [Request processing failed; nested exception is org.mybatis.spring.MyBatisSystemException: nested exception is
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 3
Mybatis错误（一）org.apache.ibatis.exceptions.PersistenceException
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.exceptions.TooManyResultsException: Expected one result (or null) to be returned by selectOne(), but found: 2 at org.m
org.mybatis.spring.MyBatisSystemException: nested exception is org.apache.ibatis.reflection.ReflectionException: There is no getter for property named 'userId' in 'class java.lang.Integer'
7、Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found):
[mybatis]org.apache.ibatis.exceptions.PersistenceException: ### Error querying database. 异常解决
HTTP Status 500 - Request processing failed; nested exception is org.apache.ibatis.binding.BindingException: Invalid bound statement (not found)
使用Mybatis连接数据库时报错：org.apache.ibatis.exceptions.PersistenceException: ### Error updating database.