This arguments are supported only JDK less than or equal to 6,
https://docs.oracle.com/cd/E13150_01/jrockit_jvm/jrockit/jrdocs/refman/optionXX.html

G1 collectors are introduced in Java 7, and other GC are made deprecated in Java 8, and removed completely from Java 9.
G1 Collector will be default, which uses advantages of all other GC’s

http://www.oracle.com/technetwork/java/javase/7u4-relnotes-1575007.html
http://openjdk.java.net/jeps/214

In Java 8, G1 Collectors are used, others are deprecated.