maven的聚合与继承

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<groupId>tz.itat.user</groupId>
	<artifactId>user-code</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>pom</packaging>
	<url>http://maven.apache.org</url>
	<!-- 导入了三个模块,把这三个模块聚合在一起了 -->
	<modules>
		<!-- 聚合是模块的位置 -->
		<module>user-core</module>
		<module>user-log</module>
		<module>user-service</module>
	</modules>
	<!-- 定义常量 -->
	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<spring.vaesion>3.1.1</spring.vaesion>
	</properties>
	<!-- 依赖管理的类,子类不会自动去依赖继承他 -->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.hibernate</groupId>
				<artifactId>hibernate-entitymanager</artifactId>
				<version>4.1.0.Final</version>
			</dependency>
			<dependency>
				<groupId>mysql</groupId>
				<artifactId>mysql-connector-java</artifactId>
				<version>5.1.24</version>
			</dependency>
			<dependency>
				<groupId>log4j</groupId>
				<artifactId>log4j</artifactId>
				<version>1.2.17</version>
			</dependency>
			<dependency>
				<groupId>commons-logging</groupId>
				<artifactId>commons-logging</artifactId>
				<version>1.1.1</version>
			</dependency>
		</dependencies>
	</dependencyManagement>
</project>

<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
	xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>tz.itat.user</groupId>
		<artifactId>user-parent</artifactId>
		<version>0.0.1-SNAPSHOT</version>
		<relativePath>../user-parent/pom.xml</relativePath>
	</parent>
	<artifactId>user-code</artifactId>
	<packaging>jar</packaging>
	<name>user-code</name>
	<dependencies>
<!--版本就是引用父类的-->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-entitymanager</artifactId>
		</dependency>
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
		</dependency>
		<dependency>
			<groupId>log4j</groupId>
			<artifactId>log4j</artifactId>
		</dependency>
	</dependencies>
</project>