Build failed in Jenkins: openmeetings » Openmeetings #1756

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See <https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/1756/display/redirect>

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Established TCP socket on 44622
maven33-agent.jar already up to date
maven33-interceptor.jar already up to date
maven3-interceptor-commons.jar already up to date
<===[JENKINS REMOTING CAPACITY]===>   channel started
Executing Maven:  -B -f <https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/pom.xml> -Dmaven.repo.local=/home/jenkins/jenkins-slave/maven-repositories/0 clean install -PallModules,Jenkins
[INFO] Scanning for projects...
[INFO] ------------------------------------------------------------------------
[INFO] Reactor Build Order:
[INFO] 
[INFO] Openmeetings
[INFO] Openmeetings Util
[INFO] Openmeetings DB
[INFO] Openmeetings Core
[INFO] Openmeetings Install
[INFO] Openmeetings Service
[INFO] Openmeetings Webservices
[INFO] Openmeetings Web
[INFO] Openmeetings Flash
[INFO] Openmeetings Screen Sharing applet
[INFO] Openmeetings Server
[INFO]                                                                         
[INFO] ------------------------------------------------------------------------
[INFO] Building Openmeetings 4.0.0-SNAPSHOT
[INFO] ------------------------------------------------------------------------
[INFO] 
[INFO] --- maven-clean-plugin:3.0.0:clean (default-clean) @ openmeetings-parent ---
[INFO] Deleting <https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/target>
[INFO] 
[INFO] --- buildnumber-maven-plugin:1.4:create (default) @ openmeetings-parent ---
[INFO] Executing: /bin/sh -c cd '<https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/'> && 'git' 'rev-parse' '--verify' 'HEAD'
[INFO] Working directory: <https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/>
[INFO] Storing buildNumber: 22d0528d65e1904fb4177e74cc7243a883554d24 at timestamp: 1501665239067
[WARNING] Cannot get the branch information from the git repository: 
Detecting the current branch failed: fatal: ref HEAD is not a symbolic ref

[INFO] Executing: /bin/sh -c cd '<https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/'> && 'git' 'rev-parse' '--verify' 'HEAD'
[INFO] Working directory: <https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/>
[INFO] Storing buildScmBranch: UNKNOWN
[INFO] 
[INFO] --- apache-rat-plugin:0.12:check (default) @ openmeetings-parent ---
[INFO] Added 1 additional default licenses.
[INFO] Enabled default license matchers.
[INFO] Added 1 custom approved licenses.
[INFO] Will parse SCM ignores for exclusions...
[INFO] Parsing exclusions from <https://builds.apache.org/job/openmeetings/org.apache.openmeetings$openmeetings-parent/ws/.gitignore>
[INFO] Finished adding exclusions from SCM ignore files.
[INFO] 76 implicit excludes (use -debug for more details).
[INFO] Exclude: **/*.mp3
[INFO] 10 resources included (use -debug for more details)
[INFO] Rat check: Summary over all files. Unapproved: 2, unknown: 2, generated: 0, approved: 3 licenses.