sts创建maven项目 引入spring，报错

 1 <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
 2     xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
 3     <modelVersion>4.0.0</modelVersion>
 4     <groupId>com.test</groupId>
 5     <artifactId>test</artifactId>
 6     <version>0.0.1-SNAPSHOT</version>
 7     <packaging>war</packaging>
 8     <url>http://maven.apache.org</url>
 9     <properties>
10         <spring.version>4.3.3.RELEASE</spring.version>
11     </properties>
12     <dependencies>
13 <!-- spring -->
14         <dependency>
15             <groupId>org.springframework</groupId>
16             <artifactId>spring-core</artifactId>
17             <version>${spring.version}</version>
18         </dependency>
19 
20 
21     </dependencies>