Problemas com atribuição de valor no getter

Boa tarde.

Quando envio meu formulario via POST, ele não está atribuindo os valores dos campos para que eu possa comparar no lado servidor, e ele me retorna undefined, alguma luz? Segue o código:

function foundUser(){

    $.ajax({
        type: "POST",
        url: "rest/authenticationRest/searchUser",
        data: JSON.stringify($("#authentication")),
        contentType: "application/json",
        success:function(date){

            alert(date.login)
        },error(err){
            console.log(err);
            alert("Erro ao processar a requisição " + err.responseText);
        }

    });
}

package br.com.festivalRest.jdbc;

import java.sql.Connection;
import java.sql.PreparedStatement;
import java.sql.ResultSet;
import java.sql.SQLException;
import java.sql.Statement;
import java.util.ArrayList;
import java.util.List;
import br.com.festivalRest.rest.jdbcinterface.FestivalDAO;
import br.com.festivalRest.objetos.User;

public class JDBCAuthenticationDAO implements FestivalDAO {
    private Connection conexao;

    public JDBCAuthenticationDAO(Connection conexao){
        this.conexao = conexao;
    }

    public boolean searchUser(User user){

        boolean checkUser = false;

        String selectUser = "select * from usuarios where login = ? and senha = ?";
        PreparedStatement p;

        try{

            p = this.conexao.prepareStatement(selectUser);
            p.setString(1, user.getLogin());
            p.setString(2, user.getSenha());
            ResultSet rs = p.executeQuery();

            while(rs.next()){
                System.out.println(user);
                checkUser = true;
            }

        } catch(Exception e){
            e.printStackTrace();
        }

        return checkUser;
    }

}

package br.com.festivalRest.rest.authentication;

import java.sql.Connection;
import java.util.ArrayList;
import java.util.List;

import javax.ws.rs.Consumes;
import javax.ws.rs.core.Response;

import com.google.gson.Gson;

import javax.ws.rs.POST;
import javax.ws.rs.Path;
import javax.ws.rs.PathParam;
import javax.ws.rs.Produces;
import javax.ws.rs.core.MediaType;

import br.com.festivalRest.bd.conexao.Conexao;
import br.com.festivalRest.jdbc.JDBCAuthenticationDAO;
import br.com.festivalRest.objetos.User;

@Path("authenticationRest")
public class AuthenticationRest extends UtilRest {

    public AuthenticationRest(){
    }

    @POST
    @Path("/searchUser")
    @Consumes(MediaType.APPLICATION_JSON)
    public Response foundUser(String usuarioParam){
        try{

            Conexao conec = new Conexao();
            Connection conexao = conec.abrirConexao();
            JDBCAuthenticationDAO jdbcAuthentication = new JDBCAuthenticationDAO(conexao);

            Gson gson = new Gson();
            User user = gson.fromJson(usuarioParam, User.class);

            jdbcAuthentication.searchUser(user);
            conec.fecharConexao();

            return this.buildResponse("OK");

        }catch(Exception e){
            e.printStackTrace();
            return this.buildErrorResponse("Falha");
        }
    }
}

                <div class="modal fade" id="modal-authentication" role="dialog">
                    <div class="modal-dialog">
                        <div class="modal-content">
                            <div class="modal-header">
                                <button type="button" class="close" data-dismiss="modal">&times;</button>
                                <h4 class="modal-title">Faça seu login</h4>
                            </div>
                            <div class="modal-body">
                                <form id="authentication" class="form">                                
                                    <div class="form-group">
                                        <label for="usuario">Usuario</label>
                                        <input type="text" class="form-control" id="login" name="login" placeholder="Informe seu usuario" >
                                    </div>
                                    <div class="form-group">
                                        <label for="password">Senha</label>
                                        <input type="password" class="form-control" id="senha" name="senha" placeholder="********" >
                                    </div>
                                </form>
                                <div class="modal-footer">
                                    <button type="button" class="btn btn-primary" data-dismiss="modal" onclick="foundUser()">Enviar</button> 
                                </div>
                            </div>
                        </div>
                    </div>
                </div>