AccessControlException: access denied - FilePermission

I am using JRE7. I have signed the jar file using jarsigner. But still I get the exception access denied ("" "C:\Program Files\Java\jre7\lib\ext\Cert.P12" "read") I am trying to read the Cert.P12 stored in that directory. I generated certificate using keytool and signed the jar. When the browser prompted me i accepted the certificate. Is it because it is not a real certificate I am getting this error? This code to read the file is an applet code. mentions that if it is signed the error will vanish. But it did not for me.
It is an applet. I am trying to load from browser.

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