Login doesn't support UTF-8

[ViktorK69]

Hi!
I faced the following issue using spring-lemon's authentication module. I've overriden the user model object and I added a 'username' column to it, and I use this as username at login.
When I add a user with special character (like ő or ű, these are often used characters in Hungarian), the authentication fails with the following response:
{"timestamp":1464383714327,"status":500,"error":"Internal Server Error","exception":"java.io.CharConversionException"
,"message":"Not an ISO 8859-1 character: ő","path":"/userCrudBoot2/login"}

However, I can save or retrieve data with these characters without any problem, the request with the url "/api/core/context" comes back with a perfect response (the characters are all correct), only the login cannot handle them. Also, some of the characters in the response of the login don't cause the error mentioned above, but in the response I see diamond characters with question mark (characters like 'ö' or 'ü'). Again, requesting the context it gives them back all correct.

I tried to override the AuthenticationSuccessHandler, and I replaced this line:
"response.setContentType(MediaType.APPLICATION_JSON_VALUE);" whit this:
"response.setContentType("application/json;charset=UTF-8");"
but it didn't help.

Also, the authentication doesn't make difference - for example- between "admin" and "ádmin", what can be a problem in Hungarian.

What can be the problem?
Thank you in advance!

[naturalprogrammer]

Seems to me like some Spring Security related problem. Did you try googling? For example, I found this stackoverflow post, which seems worth trying out -> http://stackoverflow.com/questions/9772429/spring-security-utf-8-codpage-with-russian-usernames.

[naturalprogrammer]

Not related to Spring Lemon