Issue Summary

Cannot install plugin jar file by web page upload when timezone is Alaska 

Steps to Reproduce

1. Turn on web page jar upload
2. Change user profile timezone to Alaska

Expected Results

Plugin is installed

Actual Results

The below exception is thrown in log file

msg: Unknown time-zone ID: AST
     stack: java.base/java.time.zone.ZoneRulesProvider.getProvider(ZoneRulesProvider.java:281)
java.base/java.time.zone.ZoneRulesProvider.getRules(ZoneRulesProvider.java:236)
java.base/java.time.ZoneRegion.ofId(ZoneRegion.java:121)
java.base/java.time.ZoneId.of(ZoneId.java:411) 

Workaround

Change user profile timezone to Sydney