On windows I get an error message at the end when checking the version of platuml.jar (Date November 29, 2018 21:55):
>java -Djava.awt.headless=true -jar plantuml.jar -version
PlantUML version 1.2018.14beta1 (Unknown compile time)
(GPL source distribution)
Java Runtime: Java(TM) SE Runtime Environment
JVM: Java HotSpot(TM) 64-Bit Server VM
Java Version: 1.7.0_67-b01
Operating System: Windows 7
OS Version: 6.1
Default Encoding: Cp1252
Language: en
Country: US
Machine: User-PC
PLANTUML_LIMIT_SIZE: 4096
Processors: 4
Max Memory: 1,884,815,360
Total Memory: 127,401,984
Free Memory: 124,669,824
Used Memory: 2,732,160
Thread Active Count: 1
Exception in thread "main" java.lang.NullPointerException
at net.sourceforge.plantuml.cucadiagram.dot.GraphvizUtils.useVizJs(GraphvizUtils.java:92)
at net.sourceforge.plantuml.cucadiagram.dot.GraphvizUtils.getTestDotStrings(GraphvizUtils.java:194)
at net.sourceforge.plantuml.OptionPrint.printVersion(OptionPrint.java:179)
at net.sourceforge.plantuml.Option.<init>(Option.java:279)
at net.sourceforge.plantuml.Run.main(Run.java:90)