Re: Jar's path at the runtime

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#738

From: Shankar Unni
Date: Wed, 04 Dec 2002 18:07

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Alexei Akimov wrote:

> I have a following question: Let we have a java application packed into jar
> file or native executable (using JBuilder). Can the application determine
> jar or exe file path at the runtime? 

There is a near-exact equivalent of GetModuleName (which gives you the 
executable or  DLL that defines an entry point) : you can find out where 
a particular loaded class is located, as follows (if you have an object 
of that class)

   obj.getClass().getProtectionDomain().getCodeSource().getLocation()

This expression returns you a java.net.URL of where obj.getClass() was 
loaded from.  For instance, when I run this in a standalone class file 
in the current directory, I get:

   file:/C:/Shankar/

which means that my "bar.class" was loaded from this directory (it's a 
given that "class bar" is in a file called "bar.class").  Similarly, if 
I shove bar.class into an "xxx.jar", put that in my classpath and 
execute the same program, I get

   file:/C:/Shankar/xxx.jar

--
Shankar.

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