How to use external java libraries in Database

Hi,

I am trying to use Apache.Commons or Cern Colt libraries in my database.
Both these libraries are written Java and are available as .jar files. Is it
possible to pull those libraries into Postgres and use the methods in SQL as
functions.

For example I want to use cern.jet.stat.Descriptive.harmonicMean in SQL as
follows:

select harmonicMean(100, 1000);

Please suggest me how to do this.

thanks and regards

BB23850

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