1.用maven的web模板生成了项目，然后添加了依赖这里应该没有问题

    4.0.0
    com.demo
    SeverDemo
    war
    1.0-SNAPSHOT
    SeverDemo Maven Webapp
    http://maven.apache.org
    
        
            org.mybatis
            mybatis
            3.4.0
        
        
            junit
            junit
            4.11
            test
        
        
            com.alibaba
            fastjson
            1.2.11
        
        
            mysql
            mysql-connector-java
            6.0.2
        
    
    
        SeverDemo
    

2.然后配置了mybatis-config这里应该也没啥问题

3.设置好实体类和映射文件好像也没啥问题

package com.demo.bean;

import java.util.Date;

/**
 * Created by 73196 on 2016/5/2.
 */
public class Student {
    private int id;
    private String name;
    private Date birthday;

    public int getId() {
        return id;
    }

    public void setId(int id) {
        this.id = id;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public Date getBirthday() {
        return birthday;
    }

    public void setBirthday(Date birthday) {
        this.birthday = birthday;
    }
}

    
        SELECT * FROM student WHERE ID=#{id}
    

接下来就是幺蛾子，大神先别看我的思路可能有错

1.在映射文件中他先给我来个这个

暂时先没有管
2.运行，这错误

org.apache.ibatis.exceptions.PersistenceException: 
### Error querying database.  Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.demo.mapper.StudentMapper.selectStudent
### Cause: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.demo.mapper.StudentMapper.selectStudent
    at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:150)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:141)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectOne(DefaultSqlSession.java:77)
    at com.demo.APP.main(APP.java:22)
Caused by: java.lang.IllegalArgumentException: Mapped Statements collection does not contain value for com.demo.mapper.StudentMapper.selectStudent
    at org.apache.ibatis.session.Configuration$StrictMap.get(Configuration.java:853)
    at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:686)
    at org.apache.ibatis.session.Configuration.getMappedStatement(Configuration.java:679)
    at org.apache.ibatis.session.defaults.DefaultSqlSession.selectList(DefaultSqlSession.java:147)
    ... 3 more

于是就点开源码看

get参数得到了个null抛出错误，然后我有看是哪个参数？

没错，是id?

这是什么鬼，id为空？？？？？？？？？？？？？？？？

整个项目在此 http://git.oschina.net/slgxmh/SeverDemo-Learn