Erro ao executar o método Delete

Boa tarde Rodrigo, tudo bem?

Ao executar o método DELETE no postman, estou recebendo a seguinte mensagem no console do Eclipse:

java.lang.NumberFormatException: For input string: "br.com.alura.forum.modelo.Usuario@20"
    at java.lang.NumberFormatException.forInputString(Unknown Source) ~[na:1.8.0_201]
    at java.lang.Long.parseLong(Unknown Source) ~[na:1.8.0_201]
    at java.lang.Long.parseLong(Unknown Source) ~[na:1.8.0_201]
    at br.com.alura.forum.config.TokenSecurity.getUsuarioId(TokenSecurity.java:54) ~[classes/:na]
    at br.com.alura.forum.config.AutenticacaoTokenFilter.autenticarCliente(AutenticacaoTokenFilter.java:44) ~[classes/:na]
    at br.com.alura.forum.config.AutenticacaoTokenFilter.doFilterInternal(AutenticacaoTokenFilter.java:36) ~[classes/:na]
    at org.springframework.web.filter.OncePerRequestFilter.doFilter(OncePerRequestFilter.java:119) ~[spring-web-5.2.10.RELEASE.jar:5.2.10.RELEASE]

Poderia me dar uma luz sobre o que pode estar errado?

Seguem as classes:

@Service
public class TokenSecurity {

    @Value("${forum.jwt.expiration}")
    private String expiration;

    @Value("${forum.jwt.secret}")
    private String secret;


    public String gerarToken(Authentication authentication) {
        Usuario logado = (Usuario) authentication.getPrincipal();
        Date hoje = new Date();
        Date expiracao = new Date(hoje.getTime() + Long.parseLong(expiration));

        return Jwts.builder()
                .setIssuer("API do Fórum da Alura")
                .setSubject(logado.toString())
                .setIssuedAt(hoje)
                .setExpiration(expiracao)
                .signWith(SignatureAlgorithm.HS256, secret)
                .compact();
    }


    public Boolean isTokenValido(String token) {

        try {
            Jwts.parser().setSigningKey(this.secret).parseClaimsJws(token);
            return true;

        } catch (Exception e) {
            return false;
        }

    }


    public Long getUsuarioId(String token) {
        Claims claims = Jwts.parser().setSigningKey(this.secret).parseClaimsJws(token).getBody();
        return Long.parseLong(claims.getSubject());
    }



}

public class AutenticacaoTokenFilter extends OncePerRequestFilter{

    private TokenSecurity tokenSecurity;
    private UsuarioRepository repository;

    public AutenticacaoTokenFilter(TokenSecurity tokenSecurity, UsuarioRepository repository) {
        this.tokenSecurity = tokenSecurity;
        this.repository = repository;
    }

    @Override
    protected void doFilterInternal(HttpServletRequest request, HttpServletResponse response, FilterChain filterChain)
            throws ServletException, IOException {

        String token = recuperarToken(request);

        Boolean valido = tokenSecurity.isTokenValido(token);

        if(valido) {
            autenticarCliente(token);
        }


        filterChain.doFilter(request, response);
    }

    private void autenticarCliente(String token) {
        Long usuarioId = tokenSecurity.getUsuarioId(token);
        Usuario usuario = repository.findById(usuarioId).get();
        UsernamePasswordAuthenticationToken authentication = new UsernamePasswordAuthenticationToken(usuario, null, usuario.getAuthorities());
        SecurityContextHolder.getContext().setAuthentication(authentication);
    }

    private String recuperarToken(HttpServletRequest request) {

        String token = request.getHeader("Authorization");

        if(token == null || token.isEmpty() || !token.startsWith("Bearer ")) {
            return null;
        }

        return token.substring(7, token.length());
    }

}

Desde já agradeço pela ajuda!