question: public static InputStream openSystemFile ( String filename ) throws FileNotFoundException { try { return new FileInputStream ( filename ) ; } catch ( FileNotFoundException e ) { String resname = filename . replace ( File . separatorChar , '/' ) ; InputStream result = ClassLoader . getSystemResourceAsStream ( resname ) ; if ( result == null ) { throw e ; } return result ; } }
target:  Try to open a file, first trying the file system, then falling back to the classpath.