ZooKeeper-trunk-openjdk7 - Build # 580 - Failure

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See https://builds.apache.org/job/ZooKeeper-trunk-openjdk7/580/

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Started by timer
Building remotely on ubuntu-1 (Ubuntu ubuntu) in workspace /home/jenkins/jenkins-slave/workspace/ZooKeeper-trunk-openjdk7
Updating http://svn.apache.org/repos/asf/zookeeper/trunk at revision '2014-09-25T19:51:40.297 +0000'
At revision 1627629
no change for http://svn.apache.org/repos/asf/zookeeper/trunk since the previous build
No emails were triggered.
[locks-and-latches] Checking to see if we really have the locks
[locks-and-latches] Have all the locks, build can start
[trunk] $ /home/jenkins/tools/ant/latest/bin/ant -Dtest.output=yes -Dtest.junit.output.format=xml -Djavac.target=1.7 clean test-core-java
Error: JAVA_HOME is not defined correctly.
  We cannot execute /usr/lib/jvm/java-7-openjdk-amd64//bin/java
Build step 'Invoke Ant' marked build as failure
[locks-and-latches] Releasing all the locks
[locks-and-latches] All the locks released
Recording test results
Email was triggered for: Failure
Sending email for trigger: Failure



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############################## FAILED TESTS (if any) ##############################
No tests ran.