Mybatis配置错误：java.lang.ExceptionInInitializerError

这个错误实在是特别的玄乎：
情况一：
Mybatis-config.xml配置文件

<?xml version="1.0" encoding="UTF-8" ?>
<!DOCTYPE configuration
PUBLIC "-//mybatis.org//DTD Config 3.0//EN"
"http://mybatis.org/dtd/mybatis-3-config.dtd">
<configuration>
<environments default="development">
<environment id="development">
<transactionManager type="JDBC"/>
<dataSource type="POOLED">
<property name="driver" value="com.mysql.jdbc.Driver"/>
<property name="url" value="jdbc:mysql://localhost:3306/school?useUnicode=true&amp;characterEncoding=utf8"/>
<property name="username" value="root"/>
<property name="password" value="123456"/>
</dataSource>
</environment>
</environments>
<!-- 这一步不要忘了呀-->
<mappers>
<mapper resource="com/wang/Mapper/UserMapper.xml"/>
</mappers>
</configuration>

因为在配置文件中，出现了中文注释，把中文注释（ <!-- 这一步不要忘了呀）去掉就能解决问题，真的是玄

情况二：
在Maven中pom.xml添加如下语句，可以防止资源导出失败的问题

<!--在build中配置resources，来防止我们资源导出失败的问题-->
<build>
<resources>

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

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

</resources>
</build>

情况三：
没有在Mybatis-config.xml中配置mapper

<mappers>
<mapper resource="com/wang/Mapper/User1Mapper.xml"/>
</mappers>

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