Build failed in Jenkins: Juneau-Java-1.7 #60

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See <https://builds.apache.org/job/Juneau-Java-1.7/60/>

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Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on jenkins-test-697 (Ubuntu ubuntu jenkins-cloud-8GB jenkins-cloud-4GB cloud-slave) in workspace <https://builds.apache.org/job/Juneau-Java-1.7/ws/>
 > 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/incubator-juneau.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/incubator-juneau.git
 > git --version # timeout=10
 > git -c core.askpass=true fetch --tags --progress https://git-wip-us.apache.org/repos/asf/incubator-juneau.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 47b9ce605639374daf8fb75391911ffe61e26487 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 47b9ce605639374daf8fb75391911ffe61e26487
 > git rev-list 47b9ce605639374daf8fb75391911ffe61e26487 # timeout=10
FATAL: Couldn’t find any executable in /home/jenkins/tools/maven/apache-maven-3.0.5
Build step 'Invoke top-level Maven targets' marked build as failure

Jenkins build is back to normal : Juneau-Java-1.7 #61

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See <https://builds.apache.org/job/Juneau-Java-1.7/61/changes>