ERROR 500 - But I do not know where it is wrong, someone helps me!

@PostMapping//Create
public ResponseEntity<Categoria> criar(@RequestBody Categoria categoria, HttpServletResponse response) {
    Categoria categoriaSalva = categoriaRepository.save(categoria);
    URI uri = ServletUriComponentsBuilder.fromCurrentRequestUri().path("/{codigo}").buildAndExpand(categoriaSalva.getCodigo()).toUri();
    return ResponseEntity.created(uri).body(categoriaSalva);
}

Category.java file

package com.example.demo.model;

import javax.persistence.Entity;
import javax.persistence.GeneratedValue;
import javax.persistence.GenerationType;
import javax.persistence.Id;
import javax.persistence.Table;

@Entity
@Table(name = "categoria")
public class Categoria {
    @Id
    @GeneratedValue(strategy = GenerationType.IDENTITY)
    private Long codigo;
    private String nome;
    public Long getCodigo() {
        return codigo;
    }
    public void setCodigo(Long codigo) {
        this.codigo = codigo;
    }
    public String getNome() {
        return nome;
    }
    public void setNome(String name) {
        this.nome = nome;
    }
    @Override
    public int hashCode() {
        final int prime = 31;
        int result = 1;
        result = prime * result + ((codigo == null) ? 0 : codigo.hashCode());
        return result;
    }
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        Categoria other = (Categoria) obj;
        if (codigo == null) {
            if (other.codigo != null)
                return false;
        } else if (!codigo.equals(other.codigo))
            return false;
        return true;
    }
}