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So, guys, it’s kind of a beat-up question I know, but I couldn’t find a solution to my code here. I need to get the information that’s inside node 5883, but apparently it populates my class with the information that’s on the outside and ends up making the mistake W/ClassMapper: No setter/field for 5883 found on class com.mycomics.rest.model.ComicVineIssueModel and I can’t make the comparison I need. 
Firebase:
Comicvinemodel:
public class ComicVineModel{
    private Long id;
    private String name;
    private String api_detail_url;
    public ComicVineModel() {
    }
    public Long getId() {
        return id;
    }
    public void setId(Long id) {
        this.id = id;
    }
    public String getName() {
        return name;
    }
    public void setName(String name) {
        this.name = name;
    }
    public String getApi_detail_url() {
        return api_detail_url;
    }
    public void setApi_detail_url(String api_detail_url) {
        this.api_detail_url = api_detail_url;
    }
}
Comicvineissuemodel
public class ComicVineIssueModel extends ComicVineModel{
private ComicVineModel volume;
private Integer issue_number;
private String store_date;
private String cover_date;
private ComicVineImageModel image;
private String description;
public ComicVineIssueModel() {
}
public Integer getIssue_number() {
    return issue_number;
}
public void setIssue_number(Integer issue_number) {
    this.issue_number = issue_number;
}
@Exclude
public ComicVineModel getVolume() {
    return volume;
}
public void setVolume(ComicVineModel volume) {
    this.volume = volume;
}
@Exclude
public String getStore_date() {
    return store_date;
}
public void setStore_date(String store_date) {
    this.store_date = store_date;
}
@Exclude
public ComicVineImageModel getImage() {
    return image;
}
public void setImage(ComicVineImageModel image) {
    this.image = image;
}
@Exclude
public String getDescription() {
    return description;
}
public void setDescription(String description) {
    this.description = description;
}
@Exclude
public String getCover_date() {
    return cover_date;
}
public void setCover_date(String cover_date) {
    this.cover_date = cover_date;
}
}
Issueadapter (where I am saving and searching the data)
public class IssueAdapter extends RecyclerView.Adapter<IssueAdapter.MyViewHolder> {
    private List<ComicVineIssueModel> issue;
    private Context context;
    private boolean isExpand;
    private String textoFormatado = "";
    private FirebaseAuth autenticacao;
    private DatabaseReference firebase;
    private ChildEventListener childListenerEdicao;
    private ComicVineIssueModel issueModel = new ComicVineIssueModel();
    private ArrayList<ComicVineIssueModel> listIssue = new ArrayList();
    private String volume;
    private String idEdicao;
    public IssueAdapter(List<ComicVineIssueModel> issue, Context context, String volume) {
        this.issue = issue;
        this.context = context;
        this.volume = volume;
        setHasStableIds(true);
    }
    @NonNull
    @Override
    public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View itemLista = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_issue, parent, false);
        firebase = ConfigFirebase.getFirebase();
        return new MyViewHolder(itemLista);
    }
    @Override
    public void onBindViewHolder(@NonNull final MyViewHolder holder, final int position) {
        issueModel = issue.get(position);
       /*Código retirado para uma melhor visualização de onde pode estar o problema*/
        idEdicao = issueModel.getId().toString();
        holder.check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                if(holder.check.getTag().equals("isChecked")){
                    holder.check.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.uncheck));
                    firebase.child(usuario()).child(volume).child(issue.get(position).getId().toString()).removeValue();
                    holder.check.setTag("uncheck");
                    Toast.makeText(context, issue.get(position).getName() + " deletado com sucesso!", Toast.LENGTH_LONG).show();
                }else {
                    holder.check.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.check));
                    holder.check.setTag("isChecked");
                    issueModel.setIssue_number(issue.get(position).getIssue_number());
                    issueModel.setName(issue.get(position).getName());
                    issueModel.setId(issue.get(position).getId());
                    //salva a revista no Firebase no formato de: usuario - id da revista - id da edição - dados da revista
                    DatabaseReference firebaseSalvaRevista = FirebaseDatabase.getInstance().getReference(usuario());
                    firebaseSalvaRevista.child(volume).child(issue.get(position).getId().toString()).setValue(issueModel);
                    Toast.makeText(context, issue.get(position).getName() + " está nos favoritos!", Toast.LENGTH_LONG).show();
                }
            }
        });
        firebase.child(usuario()).child(volume).child(idEdicao);
        recuperarDados(idEdicao, holder.check);
        firebase.addChildEventListener(childListenerEdicao);
    }
    @Override
    public int getItemViewType(int position) {
        return position;
    }
    @Override
    public long getItemId(int position) {
        return position;
    }
    @Override
    public int getItemCount() {
        return issue.size();
    }
    public class MyViewHolder extends RecyclerView.ViewHolder{
        private TextView ano;
        private TextView titulo;
        private TextView edicao;
        private ImageView capa;
        private ImageView check;
        private TextView informacoes;
        private ImageView seta;
        public MyViewHolder(View itemView) {
            super(itemView);
            ano = itemView.findViewById(R.id.idAnoEdicao);
            titulo = itemView.findViewById(R.id.idTitulo);
            capa = itemView.findViewById(R.id.idImagemEdicao);
            edicao = itemView.findViewById(R.id.idEdicao);
            informacoes = itemView.findViewById(R.id.idInformacoes);
            seta = itemView.findViewById(R.id.idSetaInformacoes);
            check = itemView.findViewById(R.id.idUncheck);
        }
    }
    public String usuario(){
        autenticacao = ConfigFirebase.getFirebaseAutenticacao();
        String usuario = autenticacao.getCurrentUser().getEmail().toString();
        usuario = Base64Custom.codificarBase64(usuario);
        return usuario;
    }
    public void recuperarDados(final String id, final ImageView check){
        childListenerEdicao = new ChildEventListener() {
            @Override
            public void onChildAdded(DataSnapshot dataSnapshot, String s) {
                listIssue.clear();
                for(DataSnapshot dados : dataSnapshot.getChildren()) {
                    issueModel = dados.getValue(ComicVineIssueModel.class);
                    listIssue.add(issueModel);
                    if(issueModel.getId().toString().equals(id)){
                        check.setImageDrawable(ContextCompat.getDrawable(context, R.drawable.check));
                        check.setTag("isChecked");
                    }
                }
                IssueAdapter.this.notifyDataSetChanged();
            }
            @Override
            public void onChildChanged(DataSnapshot dataSnapshot, String s) {
            }
            @Override
            public void onChildRemoved(DataSnapshot dataSnapshot) {
            }
            @Override
            public void onChildMoved(DataSnapshot dataSnapshot, String s) {
            }
            @Override
            public void onCancelled(DatabaseError databaseError) {
            }
        };
    }
}

Hello, I think you have a problem in the way you save the data, but to solve your problem, you can pick up the values with a Map...
– Eduardo Ceolin
Dude, I’m kind of new at this and I don’t know how to use Map, would you give me an example? Thanks!
– Arthurfmg
I’ve been searching the net and managed to solve my problem using Map. Thanks for the tip!
– Arthurfmg