解决：extractUnknown lifecycle phase "clear". You must specify a valid lifecycle phase or a goal ......

extractUnknown lifecycle phase "clear". You must specify a valid lifecycle phase or a goal in the format : or :[:]:. 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]

解决办法：使用下面的命令（任选其一即可）

clear package
clear install