See https://builds.apache.org/job/ZooKeeper_branch35_jdk7/864/
################################################################################### ########################## LAST 60 LINES OF THE CONSOLE ########################### Started by timer [EnvInject] - Loading node environment variables. Building remotely on H24 (ubuntu) in workspace /home/jenkins/jenkins-slave/workspace/ZooKeeper_branch35_jdk7 > git rev-parse --is-inside-work-tree # timeout=10 Fetching changes from the remote Git repository > git config remote.origin.url git://git.apache.org/zookeeper.git # timeout=10 Cleaning workspace > git rev-parse --verify HEAD # timeout=10 Resetting working tree > git reset --hard # timeout=10 > git clean -fdx # timeout=10 Fetching upstream changes from git://git.apache.org/zookeeper.git > git --version # timeout=10 > git fetch --tags --progress git://git.apache.org/zookeeper.git > +refs/heads/*:refs/remotes/origin/* > git rev-parse refs/remotes/origin/branch-3.5^{commit} # timeout=10 > git rev-parse refs/remotes/origin/origin/branch-3.5^{commit} # timeout=10 Checking out Revision 1912fa8d63e6bbfdb5bb96bec85efa7c94e131e9 (refs/remotes/origin/branch-3.5) > git config core.sparsecheckout # timeout=10 > git checkout -f 1912fa8d63e6bbfdb5bb96bec85efa7c94e131e9 > git rev-list 1912fa8d63e6bbfdb5bb96bec85efa7c94e131e9 # timeout=10 No emails were triggered. [ZooKeeper_branch35_jdk7] $ /home/jenkins/tools/ant/latest/bin/ant -Dtest.output=yes -Dtest.junit.threads=8 -Dtest.junit.output.format=xml -Djavac.target=1.7 clean test-core-java Exception in thread "main" java.lang.UnsupportedClassVersionError: org/apache/tools/ant/launch/Launcher : Unsupported major.minor version 52.0 at java.lang.ClassLoader.defineClass1(Native Method) at java.lang.ClassLoader.defineClass(ClassLoader.java:800) at java.security.SecureClassLoader.defineClass(SecureClassLoader.java:142) at java.net.URLClassLoader.defineClass(URLClassLoader.java:449) at java.net.URLClassLoader.access$100(URLClassLoader.java:71) at java.net.URLClassLoader$1.run(URLClassLoader.java:361) at java.net.URLClassLoader$1.run(URLClassLoader.java:355) at java.security.AccessController.doPrivileged(Native Method) at java.net.URLClassLoader.findClass(URLClassLoader.java:354) at java.lang.ClassLoader.loadClass(ClassLoader.java:425) at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:308) at java.lang.ClassLoader.loadClass(ClassLoader.java:358) at sun.launcher.LauncherHelper.checkAndLoadMain(LauncherHelper.java:482) Build step 'Invoke Ant' marked build as failure Recording test results ERROR: Step ?Publish JUnit test result report? failed: No test report files were found. Configuration error? Email was triggered for: Failure - Any Sending email for trigger: Failure - Any ################################################################################### ############################## FAILED TESTS (if any) ############################## No tests ran.