MyBatis

Mybatis配置文件中使用typeAliases竟然报错，错误提示：

the content of element type "configuration" must match "(properties?,settings?,typeAliases?,typeHandlers?,objectFactory?,objectWrapperFactory?,reflectorFactory?,plugins?,environments?,databaseIdProvider?,mappers?)".　

这个问题居然是typeAliases和environments元素在configuration中顺序引起的！！

最终总结：“configuration”中的元素必须按照上面错误提示中的元素顺序加入，如果前面的元素没有，可以忽略，但是所有元素的顺序不能颠倒，否则就会报上面错误！！

引起错误时候的配置：

<?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/jpetstore?autoReconnect=true&useUnicode=true&characterEncoding=utf-8" />
				<property name="username" value="root" />
				<property name="password" value="trymybest" />
			</dataSource>
		</environment>
	</environments>

	<typeAliases>
		<package name="org.mybatis.model" />
	</typeAliases>

	<mappers>
		<package name="org.mybatis.mapper" />
	</mappers>
</configuration>

修改后，正常工作的配置：

<?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>

	<typeAliases>
		<package name="org.mybatis.model" />
	</typeAliases>

	<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/jpetstore?autoReconnect=true&useUnicode=true&characterEncoding=utf-8" />
				<property name="username" value="root" />
				<property name="password" value="trymybest" />
			</dataSource>
		</environment>
	</environments>

	<mappers>
		<package name="org.mybatis.mapper" />
	</mappers>
</configuration>　

参考：

https://blog.csdn.net/chunyuan314/article/details/77478896