Maven启动报错 - No goals have been specified for this build.You must specify a valid lifecycle phase

在对Maven项目进行Build / 初始化时  可能会出现下图这种情况：

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1. [ERROR] 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: pre-clean, clean, post-clean, validate, initialize, generate-sources, process-sources, generate-resources, process-resources, compile, process-classes, generate-test-sources, process-test-sources, generate-test-resources, process-test-resources, test-compile, process-test-classes, test, prepare-package, package, pre-integration-test, integration-test, post-integration-test, verify, install, deploy, pre-site, site, post-site, site-deploy. -> [Help 1]
2. [ERROR]
3. [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
4. [ERROR] Re-run Maven using the -X switch to enable full debug logging.
5. [ERROR]
6. [ERROR] For more information about the errors and possible solutions, please read the following articles:
7. [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/NoGoalSpecifiedException

原因：

缺少了一个指定的goal，需要在项目的pom.xml文件中添加一项goal数据。

解决办法：

在安装目录下找到lib/model-builder-3.6.0.jar选择使用压缩包打开

根据这个目录META-INF——maven——org.apache.maven——maven-model-builder找到pom.xml

然后找到第一个build，在里面第一行添加：compile

1. <build>
2. <defaultGoal>compile</defaultGoal>
3. </build>