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Unsigned applets and webstart applications can only set selected "secure" properties.
or webstart developer guide:
(look for decryption of property tag)
To pass insecure property you can sign your application (including JNLP file).
Please see http://www.oracle.com/technetwork/java/javase/index-142562.html#COMMAND_LINE_ARGS and JNLP spec.
List of secure properties is being revisited from time to time to include more properties if there are good use cases and security audit considers them secure.
If you feel user.timezone should be available for unsigned apps (personally i do not see why not) then please file an RFE on Java and explain why you think this property is useful to overwrite in JNLP.