Build failed in Jenkins: kafka-trunk-jdk7 #3049

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See <https://builds.apache.org/job/kafka-trunk-jdk7/3049/display/redirect?page=changes>

Changes:

[wangguoz] MINOR: Broker down for significant amt of time system test

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu-eu3 (ubuntu xenial) in workspace <https://builds.apache.org/job/kafka-trunk-jdk7/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/kafka.git # timeout=10
Fetching upstream changes from https://git-wip-us.apache.org/repos/asf/kafka.git
 > git --version # timeout=10
 > git fetch --tags --progress https://git-wip-us.apache.org/repos/asf/kafka.git +refs/heads/*:refs/remotes/origin/*
 > git rev-parse refs/remotes/origin/trunk^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/trunk^{commit} # timeout=10
Checking out Revision f3b9afe62265d7559ef65f5aa692feecc5fa8f25 (refs/remotes/origin/trunk)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f f3b9afe62265d7559ef65f5aa692feecc5fa8f25
Commit message: "MINOR: Broker down for significant amt of time system test"
 > git rev-list 88c2b6849a5af2af74972c8b2e8431473542ca83 # timeout=10
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
Setting GRADLE_3_5_HOME=/home/jenkins/tools/gradle/3.5
[kafka-trunk-jdk7] $ /bin/bash -xe /tmp/jenkins1523141516202709991.sh
+ rm -rf <https://builds.apache.org/job/kafka-trunk-jdk7/ws/.gradle>
+ /home/jenkins/tools/gradle/3.5/bin/gradle
/tmp/jenkins1523141516202709991.sh: line 4: /home/jenkins/tools/gradle/3.5/bin/gradle: No such file or directory
Build step 'Execute shell' marked build as failure
[FINDBUGS] Collecting findbugs analysis files...
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
Setting GRADLE_3_5_HOME=/home/jenkins/tools/gradle/3.5
[FINDBUGS] Searching for all files in <https://builds.apache.org/job/kafka-trunk-jdk7/ws/> that match the pattern **/build/reports/findbugs/*.xml
[FINDBUGS] No files found. Configuration error?
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
Setting GRADLE_3_5_HOME=/home/jenkins/tools/gradle/3.5
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
Setting GRADLE_3_5_HOME=/home/jenkins/tools/gradle/3.5
<Git Blamer> Using GitBlamer to create author and commit information for all warnings.
<Git Blamer> GIT_COMMIT=f3b9afe62265d7559ef65f5aa692feecc5fa8f25, workspace=<https://builds.apache.org/job/kafka-trunk-jdk7/ws/>
[FINDBUGS] Computing warning deltas based on reference build #3048
Recording test results
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
Setting GRADLE_3_5_HOME=/home/jenkins/tools/gradle/3.5
ERROR: Step ‘Publish JUnit test result report’ failed: No test report files were found. Configuration error?
ERROR: No tool found matching GRADLE_3_4_RC_2_HOME
Setting GRADLE_3_5_HOME=/home/jenkins/tools/gradle/3.5
Not sending mail to unregistered user wangguoz@gmail.com

Jenkins build is back to normal : kafka-trunk-jdk7 #3050

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See <https://builds.apache.org/job/kafka-trunk-jdk7/3050/display/redirect?page=changes>