Java filter NullPointer

Question

Trying to create filter, need to choose records which type is not equals "N". I trying do it by this way, but I getting NullPointer. I think this is because in my database Type sometimes is null. How can I fix this filter to not get NullPointer?

Collection<Plan> plan = packet.getPlan().stream() //    
            .filter(item -> !item.getType().equals("N")) //
            .map(packetPlan -> Plan.newInstance( //
                    packetPlan, //
                    activePlan.contains(packetPlan.getType()))) //
            .collect(Collectors.toList());

"_I think this is because in my database Type sometimes is null._" - correct. "_How can I fix this filter to not get NullPointer_" - add a check for `null` in your `filter()` before getting the type. — maloomeister, Sep 13 '21 at 08:07
did you try check if object is not null before getting the type? — Timor, Sep 13 '21 at 08:08
What if I need to select those records, which have `Type` null or not equal "N"? Then adding this check is not good for me. — Deividas.r, Sep 13 '21 at 08:13

score 1 · Answer 1 · answered Sep 13 '21 at 08:07

1

Just add another filter

Collection<Plan> plan = packet.getPlan().stream() //    
            .filter(item -> item != null) //
            .filter(item -> !item.getType().equals("N")) //
            .map(packetPlan -> Plan.newInstance( //
                    packetPlan, //
                    activePlan.contains(packetPlan.getType()))) //
            .collect(Collectors.toList())

answered Sep 13 '21 at 08:07

Antoniossss

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Alternatively: `filter(Objects::nonNull)` – Thomas Sep 13 '21 at 08:08
What if I need to select those records, which have `Type` null or not equal "N"? Then adding this check is not good for me. – Deividas.r Sep 13 '21 at 08:13
Your filter says you dont. Your filter says t cannot be null. Anyway, it is up to you how you filter your stream. – Antoniossss Sep 13 '21 at 08:15

Java filter NullPointer

1 Answers1