How to execute a system command inside a SQL statement

Hi all!

I want to execute 'java MyApp' everytime one row is inserted on a table.
What is the correct function to do it?

I want something like this:

CREATE TRIGGER executeJava
     AFTER INSERT ON mytable
     FOR EACH ROW
     BEGIN
     SYSTEM('java MyApp');
     END;

I suppose SYSTEM('java MyApp') is not correct syntax. What is the correct
syntax to get it? Sorry, I'm relatively new on PostgreSQL.

Anyone can help me, please?
Thank you in advance.

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