org.apache.ibatis.exceptions.PersistenceException

初步学习mybatis

Exception in thread "main" org.apache.ibatis.exceptions.PersistenceException:

### Error opening session. Cause: java.lang.NullPointerException

### Cause: java.lang.NullPointerException

at org.apache.ibatis.exceptions.ExceptionFactory.wrapException(ExceptionFactory.java:26)

at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:91)

at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSession(DefaultSqlSessionFactory.java:46)

at bs.com.web.test.main(test.java:17)

Caused by: java.lang.NullPointerException

at org.apache.ibatis.session.defaults.DefaultSqlSessionFactory.openSessionFromDataSource(DefaultSqlSessionFactory.java:86)

... 2 more

---------配置文件的问题

<?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://127.0.0.1:3306/test" />
<property name="username" value="root" />
<property name="password" value="123456###" />
</dataSource>
</environment>

</environments>
<mappers>
<mapper resource="bs/com/mapping/userMapper.xml"/>
</mappers>

</configuration>