Calling Java from PL/SQL inside Oracle database

How to call java classes inside PL/SQL:

Senario: In this example I have implemented Digital Signature Verfication funtion inside PL/SQL using java classes.

Step 1: Create a java class in any text editor or IDE, i have created this class in NetBeans 6.

Send SMS from Oracle Forms through USB Connected GSM Devices

A Java Bean to load USB connected GSM Devices and Send unlimited bulk sms to any network.