Build failed in Jenkins: kafka-trunk-jdk8 #622

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See <https://builds.apache.org/job/kafka-trunk-jdk8/622/changes>

Changes:

[me] KAFKA-3421: Connect developer guide update and several fixes

[me] KAFKA-3520: Add system tests for REST APIs of list connector plugins

------------------------------------------
Started by an SCM change
[EnvInject] - Loading node environment variables.
Building remotely on ubuntu3 (Ubuntu ubuntu legacy-ubuntu) in workspace <https://builds.apache.org/job/kafka-trunk-jdk8/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 -c core.askpass=true 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 81f76bde8565eaffd67e5adaa69ddfdb4f5cebaa (refs/remotes/origin/trunk)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 81f76bde8565eaffd67e5adaa69ddfdb4f5cebaa
 > git rev-list 563611935d5d559722712cb00820c31a42d5726c # timeout=10
Setting GRADLE_2_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_2.4-rc-2
Setting JDK1_8_0_66_HOME=/home/jenkins/jenkins-slave/tools/hudson.model.JDK/jdk1.8.0_66
[kafka-trunk-jdk8] $ /bin/bash -xe /tmp/hudson4431225635284266538.sh
+ /home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_2.4-rc-2/bin/gradle
To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: http://gradle.org/docs/2.4-rc-2/userguide/gradle_daemon.html.
Building project 'core' with Scala version 2.10.6
:downloadWrapper

BUILD SUCCESSFUL

Total time: 16.507 secs
Setting GRADLE_2_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_2.4-rc-2
Setting JDK1_8_0_66_HOME=/home/jenkins/jenkins-slave/tools/hudson.model.JDK/jdk1.8.0_66
[kafka-trunk-jdk8] $ /bin/bash -xe /tmp/hudson2644373799165482297.sh
+ export GRADLE_OPTS=-Xmx1024m
+ GRADLE_OPTS=-Xmx1024m
+ ./gradlew -Dorg.gradle.project.maxParallelForks=1 clean jarAll testAll
To honour the JVM settings for this build a new JVM will be forked. Please consider using the daemon: https://docs.gradle.org/2.13/userguide/gradle_daemon.html.
Building project 'core' with Scala version 2.10.6
Build file '/x1/jenkins/jenkins-slave/workspace/kafka-trunk-jdk8/build.gradle': line 230
useAnt has been deprecated and is scheduled to be removed in Gradle 3.0. The Ant-Based Scala compiler is deprecated, please see https://docs.gradle.org/current/userguide/scala_plugin.html.
:clean UP-TO-DATE
:clients:clean
:connect:clean UP-TO-DATE
:core:clean
:examples:clean UP-TO-DATE
:log4j-appender:clean UP-TO-DATE
:streams:clean UP-TO-DATE
:tools:clean UP-TO-DATE
:connect:api:clean UP-TO-DATE
:connect:file:clean UP-TO-DATE
:connect:json:clean UP-TO-DATE
:connect:runtime:clean UP-TO-DATE
:streams:examples:clean UP-TO-DATE
:jar_core_2_10
Building project 'core' with Scala version 2.10.6
:kafka-trunk-jdk8:clients:compileJavawarning: [options] bootstrap class path not set in conjunction with -source 1.7
Note: Some input files use unchecked or unsafe operations.
Note: Recompile with -Xlint:unchecked for details.
1 warning

:kafka-trunk-jdk8:clients:processResources UP-TO-DATE
:kafka-trunk-jdk8:clients:classes
:kafka-trunk-jdk8:clients:determineCommitId UP-TO-DATE
:kafka-trunk-jdk8:clients:createVersionFile
:kafka-trunk-jdk8:clients:jar
:jar_core_2_10 FAILED

FAILURE: Build failed with an exception.

* What went wrong:
org.gradle.api.internal.changedetection.state.FileCollectionSnapshotImpl cannot be cast to org.gradle.api.internal.changedetection.state.OutputFilesCollectionSnapshotter$OutputFilesSnapshot

* Try:
Run with --stacktrace option to get the stack trace. Run with --info or --debug option to get more log output.

BUILD FAILED

Total time: 22.05 secs
Build step 'Execute shell' marked build as failure
Recording test results
Setting GRADLE_2_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_2.4-rc-2
Setting JDK1_8_0_66_HOME=/home/jenkins/jenkins-slave/tools/hudson.model.JDK/jdk1.8.0_66
ERROR: Step ?Publish JUnit test result report? failed: No test report files were found. Configuration error?
Setting GRADLE_2_4_RC_2_HOME=/home/jenkins/jenkins-slave/tools/hudson.plugins.gradle.GradleInstallation/Gradle_2.4-rc-2
Setting JDK1_8_0_66_HOME=/home/jenkins/jenkins-slave/tools/hudson.model.JDK/jdk1.8.0_66

Jenkins build is back to normal : kafka-trunk-jdk8 #623

[Apache Jenkins Server <je...@builds.apache.org>]

See <https://builds.apache.org/job/kafka-trunk-jdk8/623/changes>