javaplugin.vm.options is returning "null" on most of the configs against the valid set of options

Property "javaplugin.vm.options" used to return valid values against the valid and secure set of runtime arguments/properties but that's not true anymore. FOr example when -Xint is passed as runtime arg then "javaplugin.vm.options" used to retunr "-Xint" on all the configs but right now it's returning null.
Issues is reproduced mainly on VISTA and unix machines

Steps to reproduce:
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1) Try to load the following applet http://sqeweb.sfbay.sun.com/deployment2/jitu/deployment_mustang_exec_ws/deployment/src/plugin/runtimeArgs/runtimeArgs/html/auto/IntegratedMode/TestRuntimeArgsXint.html

If inside the signed applet area , nothing is getting displayed against "Vm options" then bug is reproduced