pom.xml里有紅叉報錯的解決辦法一：
1.把鼠標點在報的錯上發現pom.xml報如下錯誤：
Multiple annotations found at this line:
- Failure to transfer org.slf4j:slf4j-log4j12:jar:1.7.21 from http://repo1.maven.org/maven2 was cached in the local repository, resolution will not be
reattempted until the update interval of central has elapsed or updates are forced. Original error: Could not transfer artifact org.slf4j:slf4j-log4j12:jar:1.7.21 from/
to central (http://repo1.maven.org/maven2): ConnectException
2.將pom.xml中的這個jar包刪掉
<dependency>
<groupId>org.slf4j</groupId>
<artifactId>slf4j-log4j12</artifactId>
<version>1.7.21</version>
</dependency>
解決辦法二：
項目右鍵,properties,java build path,找到meaven依賴里有紅叉的jar包,將pom.xml中的這個jar包刪掉即可
使用spring cloud實現分布式配置管理時加入依賴后pom.xml第一行報錯
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
</dependency>
解決辦法：給依賴添加版本號即可。
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-config-server</artifactId>
<version>1.2.2.RELEASE</version>
</dependency>