報 java.lang.ExceptionInInitializerError 的常見解決方法

0. 如果你是遇到這個問題？

java.lang.ExceptionInInitializerError
Caused by: org.apache.ibatis.exceptions.PersistenceException: 
### Error building SqlSession.
### The error may exist in com/xu/dao/UserMapper.xml
### Cause: org.apache.ibatis.builder.BuilderException: Error parsing SQL Mapper Configuration. Cause: java.io.IOException: Could not find resource com/xu/dao/UserMapper.xml
	at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:30)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:80)
	at org.apache.ibatis.session.SqlSessionFactoryBuilder.build(SqlSessionFactoryBuilder.java:64)
	at com.xu.utils.MybatisUtils.<clinit>(MybatisUtils.java:27)
	... 23 more

1. mybatis的配置文件是否有錯

不管是放在src/main/java還是src/main/resources下的目錄，都是只需要寫Java之后的的路徑，如：

2. 檢查是否放行靜態資源

需要在pom問價加入以下代碼：

<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>

3.點擊maven的Lifecycle中clean然后檢查是否出現pom中配置問題

如果點檢clean出現以下問題，

請檢查pom文件，特別是以下幾個標簽是否有錯：

	<groupId>組ID</groupId>
    <artifactId>項目名</artifactId>
    <packaging>pom</packaging>