Unable to find a single main class from the following candidates 。。。

问题描述：

运行mvn install命令时，报以下错误信息：

[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.1.3.RELEASE:repackage (repackage) on project youyue-business: Execution repackage of goal org.springframework.boot:spring-boot-maven-plugin:2.1.3.RELEASE:repackage failed: Unable to find a single main class from the following candidates [com.taisheng.youyue.business.ApplicationBootstrap, com.taisheng.youyue.business.CodeGenerator, com.taisheng.youyue.business.publicUtil.sms.SMSUtil, com.taisheng.youyue.business.watch.baidu.demo.Main, com.taisheng.youyue.ty.nio.MultiplexerTimeServer, com.taisheng.youyue.ty.nio.TimeServer, com.taisheng.youyue.ty.tools.BaseStationAPI, com.taisheng.youyue.business.mon.util.LocationUtils, com.taisheng.youyue.business.mon.util.UnicodeUtils, com.taisheng.youyue.business.mon.util.VerifyCodeUtil, com.taisheng.youyue.business.mon.tools.MapDistanceUtil, com.taisheng.youyue.business.mon.utils.GetAmrDuration, com.taisheng.youyue.business.mon.utils.LonlatConversion, com.taisheng.youyue.business.mon.utils.UnicodeUtils, com.taisheng.youyue.business.mon.utils.WeatherHelper, com.taisheng.youyue.business.mon.utils.WeatherUtils, com.taisheng.youyue.business.watch.basis.lovemedical.tools.LinkHoldUpwardAnalyzeTools, com.taisheng.youyue.business.watch.basis.lovemedical.tools.WeatherUpwardAnalyzeTools] -> [Help 1][ERROR][ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.[ERROR] Re-run Maven using the -X switch to enable full debug logging.[ERROR][ERROR] For more information about the errors and possible solutions, please read the following articles:[ERROR] [Help 1] /confluence/display/MAVEN/PluginExecutionException[ERROR][ERROR] After correcting the problems, you can resume the build with the command[ERROR] mvn <goals> -rf :youyue-business

解决办法：

在pom.xml文件中添加以下代码，指定主方法所在类：

<plugin><groupId>org.springframework.boot</groupId><artifactId>spring-boot-maven-plugin</artifactId><configuration><mainClass>com.taisheng.youyue.YouYueApplication</mainClass></configuration></plugin>