how i assent java applet mysql?

i've recently gotten hobby java digest embedded page , nonetheless i'm carrying confidence issues.

i have include:

import java.sql.*;

and line:

class.forname("com.mysql.jdbc.driver").newinstance();

as good mysql .jar record src directory, works console, applet works glorious applet - adult until forname() line code, where throws exception:

    exception: com.mysql.jdbc.driverjava.lang.classnotfoundexception: com.mysql.jdbc.driver
    java.security.accesscontrolexception: opening denied (java.lang.runtimepermission exitvm.-1)
    during java.security.accesscontrolcontext.checkpermission(unknown source)
    during java.security.accesscontroller.checkpermission(unknown source)
    during java.lang.securitymanager.checkpermission(unknown source)
    during java.lang.securitymanager.checkexit(unknown source)
    during java.lang.runtime.exit(unknown source)
    during java.lang.system.exit(unknown source)
    during applet.database.connectdb(database.java:80)
    etc...

i cruise i competence means repair client.policy file, differently i competence need an condensation covering uses server-client network tie query server-side...

i'm certain java gurus here substantially know best proceed it.