NullPointer Exception while deserializing

[Animesh]

Exception in thread “main” com.fasterxml.jackson.databind.exc.ValueInstantiationException: Cannot construct instance of com.crio.warmup.stock.dto.AlphavantageCandle, problem: java.lang.NullPointerException at [Source: (File); line: 11, column: 13] (through reference chain: com.crio.warmup.stock.dto.AlphavantageDailyResponse[“Time Series (Daily)”]->java.util.LinkedHashMap[“2020-03-05”])

Unable to proceed forward, please offer some insight.

[Saurav_Crio.Do]

Can you please refer to the below FAQ link and let me know whether it was helpful or not.

Error: NullPointerException

[Artboard Copy 4] In Java, NullPointerException is a RuntimeException. NullPointerException is thrown when a program attempts to use an object/variable reference that has the null value assigned to it. Null Pointer Exception can be thrown through one of the following reasons: When a method is invoked, from a null object. Accessing or modifying an object field that is null Taking the length of null, as if it were an array When you try to synchronize over a null object. Consider the followin…

[ankushshetkar16]

@Animesh

AlphavantageCandle

Is this an interface?

[shoryajain]

Hi @Animesh,

I believe you are facing this error because you might have missed adding JsonProperty annotations, as specified in the milestone. Possibly, your LinkedHashMap is pointing to a null value when the key is “2020-03-05”.

This may also be happening because you might be trying to access the value at this key, which does not exist.

I’ll recommend you try proceeding on these solutions, see what happens and then inform us. We’ll help accordingly!

[amanagar]

I’m closing this topic due to no response from anyone since last 12 hours. If your query is resolved you can mark any reply as a solution. If you still have the query, please create a new topic paste the link of this topic in the description.