Maven工程分模块开发完成 父工程配置了 tomcat7插件，运行 run命令
执行run指令时失败，报错信息如下：
D:javaJDK8binjava.exe "-Dmaven.multiModuleProjectDirectory=D:Idea2020IntelliJ IDEA 2020.1MavenProject_parent" -Dmaven.home=D:apache-maven-3.6.3
-Dclassworlds.conf=D:apache-maven-3.6.3binm2.conf "
-Dmaven.ext.class.path=D:Idea2020IntelliJ IDEA 2020.1pluginsmavenlibmaven-event-listener.jar" "
-javaagent:D:Idea2020IntelliJ IDEA 2020.1libidea_rt.jar=50388:D:Idea2020IntelliJ IDEA 2020.1bin"
-Dfile.encoding=UTF-8 -classpath D:apache-maven-3.6.3bootplexus
-classworlds-2.6.0.jar;D:apache-maven-3.6.3bootplexus
-classworlds.license org.codehaus.classworlds.Launcher
-Didea.version2020.1 -s D:apache-maven-3.6.3confsettings.xml
-Dmaven.repo.local=D:apache-maven-3.6.3my_maven_local_repository install
[INFO] Scanning for projects...
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] 'modules.module[3]' specifies duplicate child module maven_dao @ line 29, column 17
@
[ERROR] The build could not read 1 project -> [Help 1]
[ERROR]
[ERROR] The project com.idea.maven:MavenProject_parent:1.0-SNAPSHOT (D:Idea2020IntelliJ IDEA 2020.1MavenProject_parentpom.xml) has 1 error
[ERROR] 'modules.module[3]' specifies duplicate child module maven_dao @ line 29, column 17
[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/ProjectBuildingException
分析报错原因：
[ERROR] [ERROR] Some problems were encountered while processing the POMs:
[ERROR] 'modules.module[3]' specifies duplicate child module maven_dao @ line 29, column 17
原因： 在父工程的Pom.xml 文件中，指定了重复了子模块 maven_dao
maven_dao maven_service maven_web maven_dao pom
解决： 直接将重复的部分删除即可正常运行Maven命令
总结
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