On Linux, you are able to pass JVM options and system properties when running javaws using the "-J" option. For example:

$ javaws -J-XX:+PrintFlagsFinal application.jnlp 

This is consistent with other Java tooling.

However, on Windows this does not work:

> javaws.exe -J-XX:+PrintFlagsFinal application.jnlp 

 You get:

InvalidArgumentException: [-XX:+PrintFlagsFinal], [application.jnlp]