How can I know what is causing a null pointer in my entity class getTeamId

Question

I have tried to understand what is causing my getTeamId() method in my entity return null, but I can't seem to crack the code. I have attached my adapter class, entity class and the exception thrown.

    Entity Class TeamEntity
 @SerializedName("idTeam")
    private String teamId;
        public String getTeamId() {
            return teamId;
        }

        public void setTeamId(String teamId) {
            this.teamId = teamId;
    }

And in my adapter class I have the following, it says team is null do i need to add something to it?

public class MatchAdapter extends RecyclerView.Adapter<MatchAdapter.ViewHolder> {
    private Context context;
    private TeamEntity team;
    private List<MatchEntity> matchList;

    public MatchAdapter(Context context, TeamEntity teamEntity) {
        this.context = context;
        this.team = teamEntity;
        matchList = new ArrayList<>();
    }

    public void setList(List<MatchEntity> matchList) {
        this.matchList.addAll(matchList);
        Collections.sort(this.matchList); //date order
        notifyDataSetChanged();
    }

    public void updateMatch(MatchEntity match) {
        matchList.set(matchList.indexOf(match), match);
        notifyItemChanged(matchList.indexOf(match));
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.display_match_items, parent, false);
        return new ViewHolder(view);
    }

    @Override
    public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
        MatchEntity match = matchList.get(position);
        holder.bind(match);
    }

    @Override
    public int getItemCount() {
        return matchList.size();
    }
    @Override
public void onBindViewHolder(@NonNull ViewHolder holder, int position) {
    MatchEntity match = matchList.get(position);
    holder.bind(match);
}

     void bind(MatchEntity match) {

                String homeTeam = match.getHomeTeam() != null ? match.getHomeTeam() : "";


                if (team.getTeamId().equals(match.getIdGuestTeam())) {
                    homeTextView.setText(homeTeam);


                } else {
                    homeTextView.setText(guestTeam);

                }

// Stack Trace

java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String com.sportsapp.data.room.entities.TeamEntity.getTeamId()' on a null object reference
        at com.sportsapp.presentation.ui.adapters.MatchAdapter$ViewHolder.bind(MatchAdapter.java:118)
        at com.sportsapp.presentation.ui.adapters.MatchAdapter.onBindViewHolder(MatchAdapter.java:59)
        at com.sportsapp.presentation.ui.adapters.MatchAdapter.onBindViewHolder(MatchAdapter.java:27)

`team` is `null`. It is unclear where `team` comes from. You might consider posting the entire adapter class. — CommonsWare, Apr 19 '20 at 20:29
`team` must be `null` when you call your `MatchAdapter` constructor. — CommonsWare, Apr 19 '20 at 20:36
Congratulations on using java 14 which gives you a readable explanation on what went wrong. — Thorbjørn Ravn Andersen, Apr 19 '20 at 20:37

score 0 · Answer 1 · answered Apr 19 '20 at 21:02

0

What are you passing to teamEntity?

public MatchAdapter(Context context, TeamEntity teamEntity) {
        this.context = context;
        this.team = teamEntity;
        matchList = new ArrayList<>();
    }

answered Apr 19 '20 at 21:02

Dimitar

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The matchList which is an ArrayList – Maria Apr 19 '20 at 22:23

How can I know what is causing a null pointer in my entity class getTeamId

1 Answers1