I added in Coldfusion administrator => Java and jvm => JVM arguments -Dfile.encoding=UTF8 and application server service not starting.
Here is the error. So is there a way to undo what I have done. Because there is no way access to the Administrator panel.

For those, who would encounter the same problem,
open the
ColdFusion10\cfusion\bin\jvm.configfile as you would see the JVM arguments which you have added. I deleted theDfile.encoding=UTF8and service begin running again.