Build failed in Jenkins: java-parent-project-v8-multi » JDK-1.9,master #34

[Shibboleth Jenkins]

See <https://build.shibboleth.net/jenkins/job/java-parent-project-v8-multi/jdk=JDK-1.9,label=master/34/display/redirect>

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Started by upstream project "java-parent-project-v8-multi" build number 34
originally caused by:
 Started by timer
Building on master in workspace <https://build.shibboleth.net/jenkins/job/java-parent-project-v8-multi/jdk=JDK-1.9,label=master/ws/>
 > git rev-parse --is-inside-work-tree # timeout=10
Fetching changes from the remote Git repository
 > git config remote.origin.url git://git.shibboleth.net/java-parent-project # timeout=10
Fetching upstream changes from git://git.shibboleth.net/java-parent-project
 > git --version # timeout=10
 > git fetch --tags --progress git://git.shibboleth.net/java-parent-project +refs/heads/*:refs/remotes/origin/*
Checking out Revision 5f6d33d740493b9a1ffec2db967a3228e2e66b96 (refs/remotes/origin/master)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f 5f6d33d740493b9a1ffec2db967a3228e2e66b96
Commit message: "JPAR-99 - adjust plugins for Java 9 compatibility"
 > git rev-list 5f6d33d740493b9a1ffec2db967a3228e2e66b96 # timeout=10
[master] $ /opt/maven/bin/mvn -Djdk=JDK-1.9 -Dmatrix-combinations= -Dlabel=master clean test -Prelease --update-snapshots --fail-at-end
Error: JAVA_HOME is not defined correctly.
  We cannot execute /opt/java9/bin/java
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.