Problem
If Universal Controller produces an exception similar to the following when exporting a dashboard widget or generating a scheduled chart report, a required dependency may not be installed.
When using the java-1.8.0-openjdk-headless package from the EL7 repository, it did does not include a required dependency; specifically, fontconfig.
Solution
Installing the fontconfig dependency, along with its own dependencies, will resolve the issue.
Alternatively, you can use the non-headless package, java-1.8.0-openjdk.