Exception java.util.LinkedHashMap cannot be cast to java.util.List

Question

While working around following code I got the exception given below.

List<Map<String, Object>> obj = mapper.readValue(result.getBody(), new TypeReference<Map<String,Object>>(){});

for (Map<String, Object> map : obj) {
    for(Map.Entry<String, Object> entry : map.entrySet()){
        System.out.println("Key : "+entry.getKey()+" Value is: "+entry.getValue());
    }
}

Stacktrace: java.lang.ClassCastException: java.util.LinkedHashMap cannot be cast to java.util.List

Which line is throwing the exception? The first one? Have you tried replacing new TypeReference<Map<String,Object>>(){} with new TypeReference<List<Map<String,Object>>>(){}? — Boris Pavlović
– Boris Pavlović, Commented Feb 23, 2016 at 7:12
@BorisPavlović, Yes I tried it now and I am getting exception telling: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token at [Source: {"total":1,"movies":[{"id":"771390242","title":"Deadpool"}] — Vamsi
– Vamsi, Commented Feb 23, 2016 at 7:18
Use Map<String, Object> obj = mapper.readValue(result.getBody(), new TypeReference<Map<String,Object>>(){}); — user4910279
– user4910279, Commented Feb 23, 2016 at 7:32

Lilia · Accepted Answer · 2020-12-12 16:02:55Z

2

You need to use only a Map instead of List of Map.

 Map<String, Object> object = mapper.readValue(result.getBody(), new TypeReference<Map<String,Object>>(){});
 for(Map.Entry<String, Object> entry : object.entrySet()){
    System.out.println("Key : "+entry.getKey()+" Value is:"+entry.getValue());
}

edited Dec 12, 2020 at 16:02

answered Apr 24, 2017 at 8:53

Lilia

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Comments

Benjamin · Accepted Answer · 2016-02-23 07:27:47Z

1

Try This : Are you trying to Store MapObject in List.so instead of Map store in List.

instead of:

List<Map<String, Object>> obj = mapper.readValue(result.getBody(),
new TypeReference<Map<String,Object>>(){});

Use This :

List<Map<String, Object>> obj = mapper.readValue(result.getBody(), 
new TypeReference<List<Map<String,Object>>>(){});

For Demo example This Link

edited Feb 23, 2016 at 7:27

answered Feb 23, 2016 at 7:26

Benjamin

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1 Comment

Vamsi Over a year ago

Hey @Benjamin, I tried it. After trying that I got this error: Can not deserialize instance of java.util.ArrayList out of START_OBJECT token at [Source: {"total":1,"movies":[{"id":"771390242","title":"Deadpool"}]

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