Error while connecting Applet to database within browser

Hi , I have an JApplet which is running fine under Netbeans but when i am putting it in browser using this html code
it throws some error while connecting to the database

Exception in thread "AWT-EventQueue-1" java.lang.ExceptionInInitializerError
        at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:286)
        at java.sql.DriverManager.getConnection(DriverManager.java:582)
        at java.sql.DriverManager.getConnection(DriverManager.java:207)
        at auditoriumBooking.Database.connectDB(Database.java:30) // my class (this lines job is shown below at last)
        at auditoriumBooking.Database.getAuditoriumAvailability(Database.java:41)
        at auditoriumBooking.AuditoriumBookingGUI$Screen1.getAuditoriumAvailability(AuditoriumBook
UI.java:100)
        at auditoriumBooking.AuditoriumBookingGUI$Screen1.actionPerformed(AuditoriumBookingGUI.jav
)
        at javax.swing.AbstractButton.fireActionPerformed(AbstractButton.java:1995)
        at javax.swing.AbstractButton$Handler.actionPerformed(AbstractButton.java:2318)
        at javax.swing.DefaultButtonModel.fireActionPerformed(DefaultButtonModel.java:387)
        at javax.swing.DefaultButtonModel.setPressed(DefaultButtonModel.java:242)
        at javax.swing.plaf.basic.BasicButtonListener.mouseReleased(BasicButtonListener.java:236)
        at java.awt.Component.processMouseEvent(Component.java:6289)
        at javax.swing.JComponent.processMouseEvent(JComponent.java:3267)
        at java.awt.Component.processEvent(Component.java:6054)
        at java.awt.Container.processEvent(Container.java:2041)
        at java.awt.Component.dispatchEventImpl(Component.java:4652)
        at java.awt.Container.dispatchEventImpl(Container.java:2099)
        at java.awt.Component.dispatchEvent(Component.java:4482)
        at java.awt.LightweightDispatcher.retargetMouseEvent(Container.java:4577)
        at java.awt.LightweightDispatcher.processMouseEvent(Container.java:4238)
        at java.awt.LightweightDispatcher.dispatchEvent(Container.java:4168)
        at java.awt.Container.dispatchEventImpl(Container.java:2085)
        at java.awt.Component.dispatchEvent(Component.java:4482)
        at java.awt.EventQueue.dispatchEventImpl(EventQueue.java:644)
        at java.awt.EventQueue.access$000(EventQueue.java:85)
        at java.awt.EventQueue$1.run(EventQueue.java:603)
        at java.awt.EventQueue$1.run(EventQueue.java:601)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:
        at java.awt.EventQueue$2.run(EventQueue.java:617)
        at java.awt.EventQueue$2.run(EventQueue.java:615)
        at java.security.AccessController.doPrivileged(Native Method)
        at java.security.AccessControlContext$1.doIntersectionPrivilege(AccessControlContext.java:
        at java.awt.EventQueue.dispatchEvent(EventQueue.java:614)
        at java.awt.EventDispatchThread.pumpOneEventForFilters(EventDispatchThread.java:269)
        at java.awt.EventDispatchThread.pumpEventsForFilter(EventDispatchThread.java:184)
        at java.awt.EventDispatchThread.pumpEventsForHierarchy(EventDispatchThread.java:174)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:169)
        at java.awt.EventDispatchThread.pumpEvents(EventDispatchThread.java:161)
        at java.awt.EventDispatchThread.run(EventDispatchThread.java:122)
Caused by: java.security.AccessControlException: access denied (java.util.PropertyPermission file.
ding read)
        at java.security.AccessControlContext.checkPermission(AccessControlContext.java:374)
        at java.security.AccessController.checkPermission(AccessController.java:546)
        at java.lang.SecurityManager.checkPermission(SecurityManager.java:532)
        at java.lang.SecurityManager.checkPropertyAccess(SecurityManager.java:1285)
        at java.lang.System.getProperty(System.java:650)
        at com.mysql.jdbc.StringUtils.<clinit>(StringUtils.java:70)
        ... 42 more

Is is throwing an error because i have not signed the jar file before using it in web-browser or is it a class path issue of connector/J (Mysql) ?
if it is a class-path issue, what i need to do to resolve this ?
Note: I have set the environment variables under windows ...

This is line number 30 of Database.java

Because you didn't sign the jar.

Paul Clapham wrote:Because you didn't sign the jar.

Ok thanks
and one more thing can an Applet send email ?