The JDK on the jenkins master must have graphical capabilities. Do not install the headless version.

jenkins/master/defaults/main.yml

@@ -11,6 +11,11 @@ jenkins_rh_stable_repo_key: https://pkg.jenkins.io/redhat-stable/jenkins.io.key
 jenkins_rh_latest_repo: https://pkg.jenkins.io/redhat
 jenkins_rh_latest_repo_key: https://pkg.jenkins.io/redhat/jenkins.io.key
 
+# The JDK on the jenkins master must have graphical capabilities
+openjdk_pkgs:
+  - jre
+  - jdk
+
 jenkins_packages:
   - jenkins
 
@@ -18,6 +23,7 @@ jenkins_deb_package_requirements:
   - imagemagick
   - graphviz
   - fonts-dejavu
+  - libjfreechart-java
 
 jenkins_rh_package_requirements:
   - docbook-utils-pdf