Changing error message when JWT expires

[alessandroderoma]

I tried the GET example on a secured resource:

@GET
@Produces(MediaType.APPLICATION_JSON)
public DefaultJwtCookiePrincipal getPrincipal(@Auth DefaultJwtCookiePrincipal principal) {
	return principal;
}

When the current JWT is valid I get a correct JSON, when it's expired I get Credentials are required to access this resource., and the response gets transferred as text, making the httpclient (which expects a JSON output from the service) to fail.

How can I solve this?