[INFO] Scanning for projects…
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[INFO] BUILD FAILURE
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[INFO] Total time: 0.140 s
[INFO] Finished at: 2018-12-23T22:25:01+08:00
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[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: 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-clean, clean, post-clean, pre-site, site, post-site, site-deploy. -> [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/NoGoalSpecifiedException
执行 mvn - v 报上面的错误
解决方案
在安装目录下找到 lib/maven-model-builder-3.6.0.jar 选择使用压缩包打开，根据这个目录 META-INFmavenorg.apache.mavenmaven-model-builder 找到 pom.xml 然后找到第一个 build，在后面添加 <defaultGoal>compile</defaultGoal> 然后一路保存即可