SQL & PL/SQL :: Invoking Java Class From Oracle Server?

I need to invoke a JavaMail code from oracle server. Conditions are :

On insertion of a row in a table a TRIGGER is to be run. This trigger would invoke a java code, that shoots an email, with desired credentials and login.

The code to send email, is based on JavaMail API, and is compiled on JVM version, 1.6.

The javaMail code can be loaded in oracle server using:

loadjava -user scott@TESTDB SendMailSSL.class

Another code doscmd.class is written and loaded in oracle, that is compiled in java 1.5. It is intended to call the SendMailSSL.class

import java.util.Properties;
import javax.mail.Message;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;

[code].....

Is there a way to invoke SendMailSSL.class, without upgrading the oracle Java version