错误1

java.lang.NullPointerException
 at com.utils.MybatisUtils.getSqlSession(MybatisUtils.java:34)
 at com.dao.UserDaoTest.test(UserDaoTest.java:14)
 at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
 at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
 at s

 这里一直空指针异常，原因是重复定义了sqlSessionFactory对象，把下面的SqlSessionFactory删去即可，修改后：

 错误2

在配置文件中路径一定是斜杠“/”！！！不是点！

 错误3

在些delUser()方法时parameterType写错

org.apache.ibatis.binding.BindingException: Invalid bound statement (not found): com.dao.UserMapper.delUser

 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)
 

 修改后：

 错误4

解决org.apache.ibatis.binding.BindingException: Invalid bound statement (not found)问题

这是因为生成的target文件中找不到配置文件UserMapper.xml

 解决方法，在父项目和子项目的pom.xml的<properties>标签内都加上：

 <build>
        <resources>
            <resource>
                <directory>src/main/java</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
                <filtering>true</filtering>
            </resource>

            <resource>
                <directory>src/main/resources</directory>
                <includes>
                    <include>**/*.xml</include>
                    <include>**/*.properties</include>
                </includes>
                <filtering>true</filtering>
            </resource>
        </resources>
    </build>

添加完后一定记得刷新！！maven需要刷新才能生效！！！