今天使用maven打包上传docker时，发现许多问题，就此记录一下：
1.maven打包报多个main方法的问题
[ERROR] Failed to execute goal org.springframework.boot:spring-boot-maven-plugin:2.1.12.RELEASE:repackage (default) on project blade-electronic-library: Execution default of goal org.springframework.boot:spring-boot-maven-plugin:2.1.12.RELEASE:repackage failed: Unable to find a single main class from the following candidates [org.springblade.library.ElectronicLibraryApplication, org.springblade.library.controller.BookUploadController, org.springblade.library.utils.BookmarksUtils, org.springblade.library.utils.KeyContextUtils, org.springblade.library.service.impl.BookReadRankServiceImpl] -> [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] http://cwiki.apache.org/confluence/display/MAVEN/PluginExecutionException
[ERROR]
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR] mvn <goals> -rf :blade-electronic-library
解决办法：注释掉除了启动类main方法的其余所有main方法
2.打包某子模块的时候提示模块缺失
将根模块依次进行clean compile package install后，再打包子模块
3.工程中引入别的模块时，由于在别的模块中定义了版本号property，导致无法引入模块的错误Maven: Failed to read artifact descriptor
解决办法，在别的模块的工程中的pom.xml中找到该property，并在根模块添加该property，重新并打包
4.package | install | deploy的区别
* package命令完成了项目编译、单元测试、打包功能，但没有把打好的可执行jar包（war包或其它形式的包）布署到本地maven仓库和远程maven私服仓库
* install命令完成了项目编译、单元测试、打包功能，同时把打好的可执行jar包（war包或其它形式的包）布署到本地maven仓库，但没有布署到远程maven私服仓库
* deploy命令完成了项目编译、单元测试、打包功能，同时把打好的可执行jar包（war包或其它形式的包）布署到本地maven仓库和远程maven私服仓库