启动maven服务时 出现No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or <plugin......异常

异常：

No goals have been specified for this build. You must specify a valid lifecycle phase or a goal in the format <plugin-prefix>:<goal> or <plugin-group-id>:<plugin-artifact-id>[:<plugin-version>]:<goal>. Available lifecycle phases are: validate, initialize,

原因：在pom.xm文件中配置tomcat插件时编译出现了问题

解决方法：在pom.xml文件中找到<build>标签，在里面加 上<defaultGoal>compile</defaultGoal>，代码如下：

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