How do I reference a resource in Java?

I need to read a file in my code. It physically resides here:

C:\eclipseWorkspace\ProjectA\src\com\company\somePackage\MyFile.txt

I've put it in a source package so that when I create a runnable jar file (Export->Runnable JAR file) it gets included in the jar. Originally I had it in the project root (and also tried a normal sub folder), but the export wasn't including it in the jar.

If in my code I do:

File myFile = new File("com\\company\\somePackage\\MyFile.txt");

the jar file correctly locates the file, but running locally (Run As->Java Main application) throws a file not found exception because it expects it to be:

File myFile = new File("src\\com\\company\\somePackage\\MyFile.txt");

But this fails in my jar file. So my question is, how do I make this concept work for both running locally and in my jar file?