spring junit测试找不到SpringJUnit4ClassRunner.class

pom.xml配置如下：

<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>com.lai.aop</groupId>   <artifactId>aop</artifactId>   <version>0.0.1-SNAPSHOT</version>     <dependencies>     <dependency>    <groupId>junit</groupId>    <artifactId>junit</artifactId>    <version>4.11</version>    <scope>test</scope>   </dependency>        <dependency>    <groupId>org.slf4j</groupId>    <artifactId>slf4j-log4j12</artifactId>    <version>1.6.4</version>   </dependency>   <!-- Spring -->   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-context</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-beans</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-webmvc</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-jdbc</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-aspects</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-jms</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   <dependency>              <groupId>org.springframework</groupId>               <artifactId>spring-test</artifactId>               <version>4.2.4.RELEASE</version>          </dependency>   <dependency>    <groupId>org.springframework</groupId>    <artifactId>spring-context-support</artifactId>    <version>4.2.4.RELEASE</version>   </dependency>   </dependencies> </project>

仔细一看，没什么错误，但是就是@RunWith(SpringJUnit4ClassRunner.class)报错，找不到SpringJUnit4ClassRunner.class。

再仔细一看

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

版本4.2.4之前有空格，删除空格后就能用了。

总结：在使用Maven的过程中，pom.xm中jar包的配置别出现空格。