Java write byte[] to file - empty file

Question

// Open bin file for writing:
String s = "Hello";
FileOutputStream binOutput = new FileOutputStream("out.txt");
byte[] b;
b = s.getBytes();
binOutput.write(b);
binOutput.close();

The above code was run from a java servlet page After this, I checked "out.txt" but it remained empty. It seems like a trivial task. What am I missing?

Answer 1

Flush it:

binOutput.write(b);
binOutput.flush();
binOutput.close();