Build failed in Jenkins: kafka-2.3-jdk8 #57

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See <https://builds.apache.org/job/kafka-2.3-jdk8/57/display/redirect?page=changes>

Changes:

[cmccabe] MINOR: add upgrade text (#7013)

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-2 (ubuntu trusty) in workspace <https://builds.apache.org/job/kafka-2.3-jdk8/ws/>
[WS-CLEANUP] Deleting project workspace...
[WS-CLEANUP] Deferred wipeout is used...
No credentials specified
Cloning the remote Git repository
Cloning repository https://github.com/apache/kafka.git
 > git init <https://builds.apache.org/job/kafka-2.3-jdk8/ws/> # timeout=10
Fetching upstream changes from https://github.com/apache/kafka.git
 > git --version # timeout=10
 > git fetch --tags --progress https://github.com/apache/kafka.git +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url https://github.com/apache/kafka.git # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url https://github.com/apache/kafka.git # timeout=10
Fetching upstream changes from https://github.com/apache/kafka.git
 > git fetch --tags --progress https://github.com/apache/kafka.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/2.3^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/2.3^{commit} # timeout=10
Checking out Revision 78d1b06190b4a9c395e53e4728073c16e9a5d7f8 (refs/remotes/origin/2.3)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 78d1b06190b4a9c395e53e4728073c16e9a5d7f8
Commit message: "MINOR: add upgrade text (#7013)"
 > git rev-list --no-walk dd31a1a0f44a68b99f4a7cb533e097d99a126209 # timeout=10
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1
[kafka-2.3-jdk8] $ /bin/bash -xe /tmp/jenkins2967957737735072897.sh
+ rm -rf <https://builds.apache.org/job/kafka-2.3-jdk8/ws/.gradle>
+ /home/jenkins/tools/gradle/4.8.1/bin/gradle
/tmp/jenkins2967957737735072897.sh: line 4: /home/jenkins/tools/gradle/4.8.1/bin/gradle: No such file or directory
Build step 'Execute shell' marked build as failure
[FINDBUGS] Collecting findbugs analysis files...
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1
[FINDBUGS] Searching for all files in <https://builds.apache.org/job/kafka-2.3-jdk8/ws/> that match the pattern **/build/reports/findbugs/*.xml
[FINDBUGS] No files found. Configuration error?
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1
No credentials specified
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1
<Git Blamer> Using GitBlamer to create author and commit information for all warnings.
<Git Blamer> GIT_COMMIT=78d1b06190b4a9c395e53e4728073c16e9a5d7f8, workspace=<https://builds.apache.org/job/kafka-2.3-jdk8/ws/>
[FINDBUGS] Computing warning deltas based on reference build #56
Recording test results
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1
ERROR: Step ?Publish JUnit test result report? failed: No test report files were found. Configuration error?
Setting GRADLE_4_8_1_HOME=/home/jenkins/tools/gradle/4.8.1

Jenkins build is back to normal : kafka-2.3-jdk8 #58

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See <https://builds.apache.org/job/kafka-2.3-jdk8/58/display/redirect?page=changes>