Load a config file into the classpath while using an executable jar

Question

I am building an assembly in Maven for a command line utility. I can run it as an executable jar, but it fails because I need to load the config file externally. Assuming the following config, how would I run the jar?

Jar is in /opt/myapp/lib/myapp-assembly.jar
Config is in /etc/myapp/config/settings.xml
I'm loading the code from the classpath using ClassPathResource("/settings.xml");

Any help is appreciated!

score 1 · Accepted Answer · 2011-06-30 19:01:26Z

I see two ways you could do it:

Launch the program using the jar as an archive rather than an executable jar, specifying the main class at run time. In other words, do java -classpath /opt/myapp/lib/myapp-assembly.jar:/etc/myapp/config [name of your main class].
Use the Class-Path field of the jar manifest file. Entries in it are directly added to the run time classpath, and there's nothing stopping you from specifying a filesystem directory rather than another jar file. So your manifest would contain: Class-Path: /etc/myapp/config/

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