Java SE (Java Platform, Standard Edition)

I used a class sun.jdbc.rowset.Cached In my applet,
and I deployed the applet with a JAR file which include
the package sun.jdbc.rowset.
However ,When i borow the applet form IE (or AppletViewer ) ,I get a Exception:
access denied (java.lang.RuntimePermission accessClassInPackage.sun.jdbc.rowset)

I was wordering if I need some permission ,but I just only run the class which I deployed form Web Server.

later,I add a new file java.police in my home

grant {
permission java.lang.RuntimePermission "accessClassInPackage.sun.jdbc.rowset";
};

but I can't solve the problem.
Can anybody help me?