Calling Java class stored in directory from PL/SQL

Is it possible to call Java class that is stored in directory from PL/SQL
or must those Java classes be stored in Database?
Has anyone any information considering this?
Cheers,

user529557,
You have the following options:
* Web Services
* Servlets
* EJB
* RMI
* JMS
There may be others.
Good Luck,
Avi.

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