Build failed in Jenkins: kafka-trunk-jdk9 #85

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See <https://builds.apache.org/job/kafka-trunk-jdk9/85/display/redirect?page=changes>

Changes:

[me] KAFKA-5902: Added sink task metrics (KIP-196)

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Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on H26 (couchdbtest ubuntu xenial) in workspace <https://builds.apache.org/job/kafka-trunk-jdk9/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url https://github.com/apache/kafka.git # 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 rev-parse refs/remotes/origin/trunk^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/trunk^{commit} # timeout=10
Checking out Revision 05357b7030c784a6548453f533d3c00e19548ba2 (refs/remotes/origin/trunk)
Commit message: "KAFKA-5902: Added sink task metrics (KIP-196)"
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 05357b7030c784a6548453f533d3c00e19548ba2
 > git rev-list 5663f51edfeb8f642fe74955021d6f38e9d9abe4 # timeout=10
Setting GRADLE_3_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_3.4-rc-2
[kafka-trunk-jdk9] $ /bin/bash -xe /tmp/jenkins5985609650175284353.sh
+ rm -rf <https://builds.apache.org/job/kafka-trunk-jdk9/ws/.gradle>
+ /home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_3.4-rc-2/bin/gradle

ERROR: JAVA_HOME is set to an invalid directory: /home/jenkins/tools/java/latest1.9

Please set the JAVA_HOME variable in your environment to match the
location of your Java installation.

Build step 'Execute shell' marked build as failure
Recording test results
Setting GRADLE_3_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_3.4-rc-2
ERROR: Step ?Publish JUnit test result report? failed: Test reports were found but none of them are new. Did tests run? 
For example, <https://builds.apache.org/job/kafka-trunk-jdk9/ws/clients/build/test-results/test/TEST-org.apache.kafka.clients.ApiVersionsTest.xml> is 11 days old

Setting GRADLE_3_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_3.4-rc-2

Jenkins build is back to normal : kafka-trunk-jdk9 #86

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See <https://builds.apache.org/job/kafka-trunk-jdk9/86/display/redirect?page=changes>