Build failed in Jenkins: java-metadata-aggregator-0.9-nightly #1163

[Shibboleth Jenkins]

See <http://127.0.0.1:1583/jenkins/job/java-metadata-aggregator-0.9-nightly/1163/display/redirect>

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Started by upstream project "spring-extensions-v5-nightly" build number 1541
originally caused by:
 Started by upstream project "java-support-v7-nightly" build number 1541
 originally caused by:
  Started by user Ian Young
Running as SYSTEM
Building remotely on EC2 (RHEL8) - RHEL8 (i-0bda90e6a27cb37ac) (aws-rhel8) in workspace <http://127.0.0.1:1583/jenkins/job/java-metadata-aggregator-0.9-nightly/ws/>
No credentials specified
Cloning the remote Git repository
Cloning repository git://git.shibboleth.net/java-metadata-aggregator
 > git init <http://127.0.0.1:1583/jenkins/job/java-metadata-aggregator-0.9-nightly/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/*
 > git rev-parse refs/remotes/origin/maint-0.9^{commit} # timeout=10
 > git rev-parse refs/remotes/origin/origin/maint-0.9^{commit} # timeout=10
Checking out Revision ddeb24f8feb31a57afdc61ee51054b5fa0ee98e4 (refs/remotes/origin/maint-0.9)
 > git config core.sparsecheckout # timeout=10
 > git checkout -f ddeb24f8feb31a57afdc61ee51054b5fa0ee98e4
Commit message: "Correct name for test class"
 > git rev-list --no-walk ddeb24f8feb31a57afdc61ee51054b5fa0ee98e4 # timeout=10
FATAL: Couldn’t find any executable in /opt/maven
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.