07:02:06 Started by user admin
07:02:06 Building in workspace /var/jenkins_home/workspace/demo
07:02:09 Unpacking https://repo.maven.apache.org/maven2/org/apache/maven/apache-maven/3.6.0/apache-maven-3.6.0-bin.zip to /var/jenkins_home/tools/hudson.tasks.Maven_MavenInstallation/maven on Jenkins
... ...
15:05:22 [INFO] ------------------------------------------------------------------------
15:05:22 [INFO] BUILD FAILURE
15:05:22 [INFO] ------------------------------------------------------------------------
15:05:22 [INFO] Total time:  2.671 s
15:05:22 [INFO] Finished at: 2018-11-06T07:05:22Z
15:05:22 [INFO] ------------------------------------------------------------------------
15:05:22 Waiting for Jenkins to finish collecting data[ERROR] Unknown lifecycle phase "mvn". 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]
15:05:22 [ERROR] 
15:05:22 [ERROR] To see the full stack trace of the errors, re-run Maven with the -e switch.
15:05:22 [ERROR] Re-run Maven using the -X switch to enable full debug logging.
15:05:22 [ERROR] 
15:05:22 [ERROR] For more information about the errors and possible solutions, please read the following articles:
15:05:22 [ERROR] [Help 1] http://cwiki.apache.org/confluence/display/MAVEN/LifecyclePhaseNotFoundException
15:05:22 
15:05:22 [JENKINS] Archiving /var/jenkins_home/workspace/demo/pom.xml to com.demo/demo/1.0/demo-1.0.pom
15:05:22 channel stopped
15:05:22 Finished: FAILURE

解决方案

 Goals and options 去掉 mvn

接下来，再进行构建，发现正常了。