Build failed in Jenkins: java-support-multi-jdk-os » OpenJDK-1.7.0,WindowsServer2012 #2

[Shibboleth Jenkins]

See <https://build.shibboleth.net/jenkins/job/java-support-multi-jdk-os/jdk=OpenJDK-1.7.0,label=WindowsServer2012/2/>

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Started by upstream project "java-support-multi-jdk-os" build number 2
originally caused by:
 Started by user Tom Zeller
Building remotely on WindowsServer2012 (windows) in workspace <https://build.shibboleth.net/jenkins/job/java-support-multi-jdk-os/jdk=OpenJDK-1.7.0,label=WindowsServer2012/ws/>
 > C:\Users\jenkins\AppData\Local\Programs\Git\bin\git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > C:\Users\jenkins\AppData\Local\Programs\Git\bin\git config remote.origin.url git://git.shibboleth.net/java-support # timeout=10
Fetching upstream changes from git://git.shibboleth.net/java-support
 > C:\Users\jenkins\AppData\Local\Programs\Git\bin\git --version # timeout=10
 > C:\Users\jenkins\AppData\Local\Programs\Git\bin\git -c core.askpass=true fetch --tags --progress git://git.shibboleth.net/java-support +refs/heads/*:refs/remotes/origin/*
Checking out Revision f4067e25bfc5fc2d8cbf77e978e1e0eba57759f4 (refs/remotes/origin/master)
 > C:\Users\jenkins\AppData\Local\Programs\Git\bin\git config core.sparsecheckout # timeout=10
 > C:\Users\jenkins\AppData\Local\Programs\Git\bin\git checkout -f f4067e25bfc5fc2d8cbf77e978e1e0eba57759f4
First time build. Skipping changelog.
[WindowsServer2012] $ cmd.exe /C '"C:\Users\jenkins\apache-maven-3.3.1\bin\mvn.cmd -Djdk=OpenJDK-1.7.0 -Dlabel=WindowsServer2012 clean test && exit %%ERRORLEVEL%%"'

Error: JAVA_HOME is set to an invalid directory. 
JAVA_HOME = "/usr/lib/jvm/java-1.7.0-openjdk" 
Please set the JAVA_HOME variable in your environment to match the 
location of your Java installation. 

Build step 'Invoke top-level Maven targets' marked build as failure
TestNG Reports Processing: START
Looking for TestNG results report in workspace using pattern: **/target/surefire-reports/testng-results.xml
Did not find any matching files.