com.sun.net cannot be resolved to a type

I have a written a client to connect to a Web Service over SSL. I have added the class "com.sun.net.ssl.internal.ssl.Provider" as the security provider in my code. I am using j2sdk1.4.2_04. When I am compiling I do not get any errors. But however when I am running I get an error " com.sun.net cannot be resolved to a type unresolved compilation problems"

[362 byte] By [HarryJTyro@WTa] at [2007-10-3 8:34:23]