It seems like you need to run the code to see all the keys. I know the question is about java, but the fastest way to get the keys is to run the groovy (or gradle) script:
javax.swing.UIManager.getDefaults().keys().toList().toSorted().each {println it}
Paste it into the file and call groovy keys.groovy or gradle -b keys.groovy , which tool is easier for you to get.
Without creating a file, it can also be executed using groovy. Just do:
groovy -e "javax.swing.UIManager.getDefaults().keys().toList().toSorted().each {println it}"
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