Problem: 

Verifying signed applet and HTTPS certificate requires access to a root cert store. However, the cacerts file that comes with the JRE is insufficient, so some of the certificates may not be verified and generate confusing warning messages to the users.

Solution: 

Access browser certificate store during signed applets and HTTPS certification verification process if verification through cacerts fails. This ensure certificate will be verified properly without suffering with the insufficient capability of cacerts.