今天在添加slf4j maven依赖的时候，出现了如下的错误：
Failed to execute goal on project MysqlOptimize: Could not resolve dependencies for project cn.zyy:MysqlOptimize:jar:0.0.1-SNAPSHOT: Failure to find org.slf4j:slf4j-parent:jar:1.7.12 in http://repo.maven.apache.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 -> [Help 1]
出错原因：maven依赖中的<artifactId>和<version>两个标签内容不对应导致
另外附两个查询 maven坐标的网站：
1.http://mvnrepository.com/artifact 此网站快一些
2.http://search.maven.org/ 中央仓库