Problem building simple jar from JDev

Question

Hi,
I have an application using bc4j/jclient running under JDev 9.0.2.
Now I want to deploy the whole application into one jar file, including all the used libraries (for bc4j, log4j, ...).
This works fine using the "simple jar wizard". I get one big jar file with everything I need.
The problem occurs when starting the application with something like "java -jar archive1.jar". The application runs fine until the moment, where an ini-file should be read. I get a FileNotFoundException for that ini file. The ini file itself is contained in the jar file, exactly in the directory where I would have supposed it to be (../app/config/app.ini).
From within JDeveloper everything works fine.
Could someone tell me, what I miss? Seems like there is used another "virtual root dir" or do I have to alter the manifest file?
Thanks in advance,
Torsten.

Answer 1

I found the solution for the problem.
If you put an application into a jar file, you can't read images, ini-files, etc. with a kind of File.open(). The files are then searched at runtime in the dir where the jar exists (or in a classpath). You have to use something like "MyClass.class.getResource()" to get the right URL to a resource you want to load.
This is a pure java standard issue, nothing to do with BC4J/JClient or JDeveloper.
Thanks,
Torsten.