Maven中依赖版本（Jar包）冲突

2.2 依赖版本冲突的解决
1、 第一声明优先原则，相当于父级优先

org.springframework spring-context 4.2.4.RELEASE

<dependency>
	<groupId>org.apache.struts</groupId>
	<artifactId>struts2-spring-plugin</artifactId>
	<version>2.3.24</version>
</dependency>

2、 路径近者优先原则
自己添加jar包

<dependency>
	<groupId>org.springframework</groupId>
	<artifactId>spring-beans</artifactId>
	<version>4.2.4.RELEASE</version>
</dependency>

3、 排除原则，使用exclusion排除

<properties>
		<spring.version>4.2.4.RELEASE</spring.version>
		<hibernate.version>5.0.7.Final</hibernate.version>
		<struts.version>2.3.24</struts.version>
	</properties>

	<!-- 锁定版本，struts2-2.3.24、spring4.2.4、hibernate5.0.7 -->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-context</artifactId>
				<version>${spring.version}</version>
			</dependency>
</dependencies>
</dependencyManagement>

强制设置依赖版本

<!-- 自定义属性 -->
<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>cn.itcast</groupId>
  <artifactId>ssh</artifactId>
  <version>0.0.1-SNAPSHOT</version>
  <packaging>war</packaging>
   <!-- 属性 -->
	<properties>
		<spring.version>4.2.4.RELEASE</spring.version>
		<hibernate.version>5.0.7.Final</hibernate.version>
		<struts.version>2.3.24</struts.version>
	</properties>

	<!-- 锁定版本，struts2-2.3.24、spring4.2.4、hibernate5.0.7 -->
	<dependencyManagement>
		<dependencies>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-context</artifactId>
				<version>${spring.version}</version>		//使用自定义属性
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-aspects</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-orm</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-test</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.springframework</groupId>
				<artifactId>spring-web</artifactId>
				<version>${spring.version}</version>
			</dependency>
			<dependency>
				<groupId>org.hibernate</groupId>
				<artifactId>hibernate-core</artifactId>
				<version>${hibernate.version}</version>
			</dependency>
			<dependency>
				<groupId>org.apache.struts</groupId>
				<artifactId>struts2-core</artifactId>
				<version>${struts.version}</version>
			</dependency>
			<dependency>
				<groupId>org.apache.struts</groupId>
				<artifactId>struts2-spring-plugin</artifactId>
				<version>${struts.version}</version>
			</dependency>
		</dependencies>
	</dependencyManagement>


	<!-- 依赖管理 -->
	<dependencies>
		<!-- spring -->
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-context</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-aspects</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-orm</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-test</artifactId>
		</dependency>
		<dependency>
			<groupId>org.springframework</groupId>
			<artifactId>spring-web</artifactId>
		</dependency>
		<!-- hibernate -->
		<dependency>
			<groupId>org.hibernate</groupId>
			<artifactId>hibernate-core</artifactId>
		</dependency>

		<!-- 数据库驱动 -->
		<dependency>
			<groupId>mysql</groupId>
			<artifactId>mysql-connector-java</artifactId>
			<version>5.1.6</version>
			<scope>runtime</scope>
		</dependency>
		<!-- c3p0 -->

		<dependency>
			<groupId>c3p0</groupId>
			<artifactId>c3p0</artifactId>
			<version>0.9.1.2</version>
		</dependency>


		<!-- 导入 struts2 -->
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-core</artifactId>
		</dependency>
		<dependency>
			<groupId>org.apache.struts</groupId>
			<artifactId>struts2-spring-plugin</artifactId>
		</dependency>

		<!-- servlet jsp -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>servlet-api</artifactId>
			<version>2.5</version>
			<scope>provided</scope>
		</dependency>
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jsp-api</artifactId>
			<version>2.0</version>
			<scope>provided</scope>
		</dependency>
		<!-- 日志 -->
		<dependency>
			<groupId>org.slf4j</groupId>
			<artifactId>slf4j-log4j12</artifactId>
			<version>1.7.2</version>
		</dependency>
		<!-- junit -->
		<dependency>
			<groupId>junit</groupId>
			<artifactId>junit</artifactId>
			<version>4.9</version>
			<scope>test</scope>
		</dependency>
		<!-- jstl -->
		<dependency>
			<groupId>javax.servlet</groupId>
			<artifactId>jstl</artifactId>
			<version>1.2</version>
		</dependency>
	</dependencies>

	<build>
		<plugins>
			<!-- 设置编译版本为1.7 -->
			<plugin>
				<groupId>org.apache.maven.plugins</groupId>
				<artifactId>maven-compiler-plugin</artifactId>
				<configuration>
					<source>1.7</source>
					<target>1.7</target>
					<encoding>UTF-8</encoding>
				</configuration>
			</plugin>

			<!-- maven内置 的tomcat6插件 -->
			<plugin>
				<groupId>org.codehaus.mojo</groupId>
				<artifactId>tomcat-maven-plugin</artifactId>
				<version>1.1</version>
				<configuration>
					<!-- 可以灵活配置工程路径 -->
					<path>/ssh</path>
					<!-- 可以灵活配置端口号 -->
					<port>8080</port>
				</configuration>
			</plugin>

		</plugins>
	</build>
</project>