Classpath resource within jar

Question

I have a project A, which contains some java files and a classpath resource R.txt. Within the project I use ClassLoader.getSystemResource(\"R.txt\"); to retrieve R.txt.

Answer 1

Apparently your JAR is not loaded by the system classloader, so getSystemResource() can't work. This should work:

ClassFromProjectA.class.getClassLoader().getResource("R.txt")

IMO more convenient is putting resources inside the same package as the classes that use them, so you can use the shorter

ClassFromProjectA.class.getResource("R.txt")

(or, inside that class just getClass().getResource("R.txt"))