…s already been passed into response body.

… java-jwt fire any exception now it is encapsulated in this one.

The java-jwt throws some exceptions when the token is invalid. Because of that we need to use this TokenException to catch when token is invalid.

…oJson().

…ted.

The sets of content type and character encoding were moved to begin of method because it is the same in "if" and "else" statements.

…ecessary just if we need to pass headers to next filter (or servlet).

Added try catch to JWTUtil.decode, because we need to know when token is invalid (and send error to the frontend).

…ends with "login". If yes it just go to next filter, if not, it does the filter logic.