Added a warning about Security Manager deprecation and handle exception in Java 17+ (closes #286) #301
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When using a newer Java (such as Java 21), throws an UnsupportedOperationException when attempting to call
System.setSecurityManager
whenjava.security.manager
isn't set toallow
, we make theallowSystemExit
option a no-op and print a better error message.In addition, we print a warning about
allowSystemExit
being deprecated.