maven清楚不同版本的重复依赖

pom文件加入：

 1 <dependencyManagement>
 2 <dependencies>
 3     <dependency>
 4     <groupId>org.springframework</groupId>
 5     <artifactId>spring-framework-bom</artifactId>
 6     <version>4.2.2.RELEASE</version>
 7     <type>pom</type>
 8     <scope>import</scope>
 9     </dependency>
10     <dependency>
11     <groupId>com.fasterxml.jackson.core</groupId>
12     <artifactId>jackson-annotations</artifactId>
13     <version>2.7.0-rc3</version>
14     </dependency>
15     <dependency>
16     <groupId>com.fasterxml.jackson.core</groupId>
17     <artifactId>jackson-core</artifactId>
18     <version>2.7.0-rc3</version>
19     </dependency>
20     <dependency>
21     <groupId>com.fasterxml.jackson.core</groupId>
22     <artifactId>jackson-databind</artifactId>
23     <version>2.7.0-rc3</version>
24     </dependency>
25 </dependencies>
26 </dependencyManagement>

<dependencyManagement>    <dependencies>        <dependency>            <groupId>org.springframework</groupId>            <artifactId>spring-framework-bom</artifactId>            <version>4.2.2.RELEASE</version>            <type>pom</type>            <scope>import</scope>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-annotations</artifactId>            <version>2.7.0-rc3</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-core</artifactId>            <version>2.7.0-rc3</version>        </dependency>        <dependency>            <groupId>com.fasterxml.jackson.core</groupId>            <artifactId>jackson-databind</artifactId>            <version>2.7.0-rc3</version>        </dependency>    </dependencies></dependencyManagement>