java - J2EE : Issue with reading file - charset.MalformedInputException

Question

I have an issue with this line of code :

Map<String, Long> wordCounts = Files.lines(Paths.get(fileSource))
                .flatMap(line -> pattern.splitAsStream(line))
                .collect(Collectors.groupingBy(String::toLowerCase,
                    TreeMap::new, Collectors.counting()));

If I run from Intellij it works fine.
If I package my application (Maven) and run it with :

java -jar myapp.war

I am getting this error :

Caused by: java.nio.charset.MalformedInputException: Input length = 1

I don't know why.

[UPDATE] This way, the file is being created.

Path path = Paths.get(newTxtName);
try {
    BufferedWriter writer = Files.newBufferedWriter(path, StandardCharsets.UTF_8);
    writer.append(parsedDocx);
    writer.close();
} catch (IOException e) {
    e.printStackTrace();
}

But there is something wrong with this line when I execute the war file on a different Server(windows 10 family) (not my pc) :

 Map<String, Long> wordCounts = Files.lines(Paths.get(fileSource), Charset.forName("UTF-8"))

I get a

java.nio.file.AccessDeniedException: <fileName>

It works fine on my computer (windows 10 family) though, with the same war.

Answer 1

If you know the character encoding of the file you are reading, then use method lines(Path, Charset) in class java.nio.file.Files. From your comment it appears that the file encoding is UTF-8. So the code in your question should be:

Map<String, Long> wordCounts = Files.lines(Paths.get(fileSource),
                                           Charset.forName("UTF-8"))
                                    .flatMap(line -> pattern.splitAsStream(line))
                                    .collect(Collectors.groupingBy(String::toLowerCase,
                                             TreeMap::new, Collectors.counting()));