報錯資訊：

[INFO] ------------------------------------------------------------------------
[INFO] Reactor Summary:
[INFO] 
[INFO] e3-manager ......................................... SUCCESS [  1.286 s]
[INFO] e3-manager-pojo .................................... SUCCESS [  0.676 s]
[INFO] e3-manager-dao ..................................... SUCCESS [  0.168 s]
[INFO] e3-manager-interface ............................... SUCCESS [  0.113 s]
[INFO] e3-manager-service ................................. SUCCESS [  0.152 s]
[INFO] e3-manager-web ..................................... FAILURE [  1.496 s]
[INFO] ------------------------------------------------------------------------
[INFO] BUILD FAILURE
[INFO] ------------------------------------------------------------------------
[INFO] Total time: 4.345 s
[INFO] Finished at: 2018-08-28T14:08:53+08:00
[INFO] Final Memory: 18M/207M
[INFO] ------------------------------------------------------------------------
[ERROR] Failed to execute goal org.apache.tomcat.maven:tomcat7-maven-plugin:2.2:run (default-cli) on project e3-manager-web: Could not start Tomcat: Failed to start component [StandardServer[-1]]: Failed to start component [StandardService[Tomcat]]: Failed to start component [StandardEngine[Tomcat]]: A child container failed during start -> [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/MojoExecutionException
[ERROR] 
[ERROR] After correcting the problems, you can resume the build with the command
[ERROR]   mvn <goals> -rf :e3-manager-web
 

顯示的錯誤資訊：找不到Tomcat，開啟Tomcat失敗。

查詢過程：本專案是在manager裡面的pom.xml內配置的Tomcat外掛：

<!-- 配置tomcat外掛 -->
	<build>
		<plugins>
			<plugin>
				<groupId>org.apache.tomcat.maven</groupId>
				<artifactId>tomcat7-maven-plugin</artifactId>
				<configuration>
					<path>/</path>
					<port>8080</port>
				</configuration>
			</plugin>
		</plugins>
	</build>
 

而manager的Tomcat是引用的parent裡面的pom.xml內配置的Tomcat外掛：

<!-- 配置Tomcat外掛 -->
<plugin>
    <groupId>org.apache.tomcat.maven</groupId>
    <artifactId>tomcat7-maven-plugin</artifactId>
    <version>2.2</version>
</plugin>

原因：是jdk版本的問題，Tomcat7預設使用的jdk是jdk1.7。我原來配置的是1.8，所以一直報錯。

後來在 windows-preference-java-Installed JREs 裡面配置jdk版本為1.7，專案執行成功。

專案執行成功：