报错，最近整合ssm项目时遇到了这样的问题Exception in thread "main"

Question

Exception in thread "main" org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.example.ssm.mapper.UserDao.queryUserById
	at org.apache.ibatis.binding.MapperMethod$SqlCommand.<init>(MapperMethod.java:235)
	at org.apache.ibatis.binding.MapperMethod.<init>(MapperMethod.java:53)
	at org.apache.ibatis.binding.MapperProxy.lambda$cachedMapperMethod$0(MapperProxy.java:98)
	at java.util.concurrent.ConcurrentHashMap.computeIfAbsent(ConcurrentHashMap.java:1660)
	at org.apache.ibatis.binding.MapperProxy.cachedMapperMethod(MapperProxy.java:97)
	at org.apache.ibatis.binding.MapperProxy.invoke(MapperProxy.java:92)
	at com.sun.proxy.$Proxy2.queryUserById(Unknown Source)
	at com.example.ssm.ssm.start.main(start.java:21)

上面是报错信息，我用的是ssm框架，整合期间报的错误：下面是我的类还有xml文件：

网上查的都是映射文件和接口类不在同一个目录下还有id名跟接口方法名不一致还有命名空间路径不对。这些我都检查了好几遍，确认没有错，请各位大佬指点指点

Answer 1

把SQL语句写成一行

select * from tb_user;

试试