Calling Holders.grailsApplication.metadata.getServletVersion() throws the following error wherever I place the code:
java.lang.NullPointerException: null
at java.util.Objects.requireNonNull(Objects.java:203)
at java.util.Optional.<init>(Optional.java:96)
at java.util.Optional.of(Optional.java:108)
at grails.util.Metadata.getServletVersion(Metadata.groovy:284)
at grails.util.Metadata$getServletVersion$1.call(Unknown Source)