"Wrong FS... expected: file:///" when trying to read file from HDFS in Java

Try this:

Configuration configuration = new Configuration();
FileSystem fs = FileSystem.get(new URI(<url:port>), configuration);
Path filePath = new Path(<path/to/file>);
FSDataInputStream fsDataInputStream = fs.open(filePath);
BufferedReader br = new BufferedReader(new InputStreamReader(fsDataInputStream));

Please refer to http://techidiocy.com/java-lang-illegalargumentexception-wrong-fs-expected-file/

A similar problem is addressed.