Build failed in Jenkins: java-metadata-aggregator-0.10-multi » JDK-12,WindowsServer2012 #1142

[Shibboleth Jenkins]

See <https://build.shibboleth.net/jenkins/job/java-metadata-aggregator-0.10-multi/jdk=JDK-12,label=WindowsServer2012/1142/display/redirect>

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Started by upstream project "java-metadata-aggregator-0.10-multi" build number 1142
originally caused by:
 Started by timer
Building remotely on WindowsServer2012 (windows) in workspace <https://build.shibboleth.net/jenkins/job/java-metadata-aggregator-0.10-multi/jdk=JDK-12,label=WindowsServer2012/ws/>
No credentials specified
Cloning the remote Git repository
Cloning repository git://git.shibboleth.net/java-metadata-aggregator
 > git init <https://build.shibboleth.net/jenkins/job/java-metadata-aggregator-0.10-multi/jdk=JDK-12,label=WindowsServer2012/ws/> # timeout=10
Fetching upstream changes from git://git.shibboleth.net/java-metadata-aggregator
 > git --version # timeout=10
 > git fetch --tags --progress git://git.shibboleth.net/java-metadata-aggregator +refs/heads/*:refs/remotes/origin/*
 > git config remote.origin.url git://git.shibboleth.net/java-metadata-aggregator # timeout=10
 > git config --add remote.origin.fetch +refs/heads/*:refs/remotes/origin/* # timeout=10
 > git config remote.origin.url git://git.shibboleth.net/java-metadata-aggregator # timeout=10
Fetching upstream changes from git://git.shibboleth.net/java-metadata-aggregator
 > git fetch --tags --progress git://git.shibboleth.net/java-metadata-aggregator +refs/heads/*:refs/remotes/origin/*
Checking out Revision ee32e510b7bf094f791db56d4cde70dc20d1d334 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f ee32e510b7bf094f791db56d4cde70dc20d1d334
Commit message: "Correct name for test class"
First time build. Skipping changelog.
[WindowsServer2012] $ cmd.exe /C '""C:\Program Files\Apache\apache-maven-3.6.0\bin\mvn.cmd"' -f aggregator-parent/pom.xml -Djdk=JDK-12 -Dmatrix-combinations= -Dlabel=WindowsServer2012 -B clean test -Prelease --update-snapshots --fail-at-end && exit %%ERRORLEVEL%%"
The JAVA_HOME environment variable is not defined correctly 
This environment variable is needed to run this program 
NB: JAVA_HOME should point to a JDK not a JRE 
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.