call executable with PL/SQL

Hello.

I'm trying to find a way to call an executable with PL/SQL. Making a schedule job is not an option.

I searched the internet and I found out that it is possible with Java code.

My questions.

1) Can I do it without using Java code?

2) If the first is not possible is there an Oracle documentation explaining how to do this with Java code? In the internet every page has a different scenario and instructions are not so clear.

Thanks