Storing configuration in JSF - what is the best practice

Question

Hello,
I would like to know how I should store my webapp configuration. At the time being I have the settings in a .properties file. The problem is that it is compiled in the war file. Thus, I do not know how I could edit the file via my application. I want to enable the user to change the configuration.
Another possibility would be to store that in a database. But I do not believe it is the best available solution. Though, I cannot find any satisfying answer to this question anywhere.
Jan

Answer 1

I am sorry, I wrote that in short. I used the way of File -> FileOutputStream but it did not work.
Now it is working, hooray. Thank you! But I would like to have the possibility to determine where exactly the properties file should be.
I have three paths in my classpath - two of them are some Tomcat folders. I do not have the root path there (C:/).
// the file is found in the classpath: F:/Program Files/Apache Software Foundation/Tomcat 5.5/shared/classes/
InputStream is = getClass().getResourceAsStream("/prop.properties");
// Then writing:
// try-catch etc. left out here
File file = new File("propx.properties");
OutputStream os = new FileOutputStream(file);
prop.store(os, null);I set a different file name to be sure it is that new one.
That creates the property file in F:\Program Files\Apache Software Foundation\Tomcat 5.5\bin directory which I consider being strange because it is not in the classpath.
When I used "/propx.properties" (the slash at the beginning), the file was saved to C:/ which is not in the classpath either.
It would be great to be able to determine where exactly it should be created.