Build failed in Jenkins: brooklyn-master-build-docker-pipeline #40

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See <https://builds.apache.org/job/brooklyn-master-build-docker-pipeline/40/display/redirect>

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Started by timer
Obtained Jenkinsfile from git https://git-wip-us.apache.org/repos/asf/brooklyn.git
Running in Durability level: MAX_SURVIVABILITY
[Pipeline] node
Running on H25 in /home/jenkins/jenkins-slave/workspace/brooklyn-master-build-docker-pipeline
[Pipeline] {
[Pipeline] catchError
[Pipeline] {
[Pipeline] withEnv
[Pipeline] {
[Pipeline] stage
[Pipeline] { (Clone repository)
[Pipeline] checkout
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://git-wip-us.apache.org/repos/asf/brooklyn.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/brooklyn.git
 > git --version # timeout=10
 > git fetch --tags --progress https://git-wip-us.apache.org/repos/asf/brooklyn.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/master^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/master^{commit} # timeout=10
Checking out Revision 7f421bb10bffe1ba966d3a16bf1f172f85d84022 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 7f421bb10bffe1ba966d3a16bf1f172f85d84022
Commit message: "This closes #23"
 > git rev-list --no-walk 7f421bb10bffe1ba966d3a16bf1f172f85d84022 # timeout=10
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Prepare environment)
[Pipeline] echo
Creating maven cache ...
[Pipeline] sh
[brooklyn-master-build-docker-pipeline] Running shell script
+ mkdir -p /home/jenkins/jenkins-slave/workspace/brooklyn-master-build-docker-pipeline/.m2
[Pipeline] sh
[brooklyn-master-build-docker-pipeline] Running shell script
+ git submodule init
[Pipeline] sh
[brooklyn-master-build-docker-pipeline] Running shell script
+ git submodule update --remote --merge --recursive
fatal: unable to access 'https://github.com/apache/brooklyn-ui.git/': Could not resolve host: github.com
Unable to fetch in submodule path 'brooklyn-ui'
[Pipeline] }
[Pipeline] // stage
[Pipeline] }
[Pipeline] // withEnv
[Pipeline] }
ERROR: script returned exit code 1
[Pipeline] // catchError
[Pipeline] stage
[Pipeline] { (Publish test results)
[Pipeline] junit
Recording test results
[Pipeline] step
TestNG Reports Processing: START
Looking for TestNG results report in workspace using pattern: **/testng-results.xml
Did not find any matching files.
[Pipeline] }
[Pipeline] // stage
[Pipeline] stage
[Pipeline] { (Send notifications)
[Pipeline] step