Deserialize string value json to generic java object

Asked Sep 12 '19 at 06:18

Active Sep 12 '19 at 11:09

Viewed 1,182 times

I have records coming in ConsumerRecords for kafka consumer. I have to iterate through the ConsumerRecord and convert string(json) value to generic type object. Please help how this can be done. I don't want to use ClassName but generic type.

for (ConsumerRecord<Integer, String> cr : records) {
                String str = cr.value();
                Gson gson = new Gson();
                ClassName dto = gson.fromJson(str, ClassName.class);
            }
        }

Now I did some changes and wrote the code as below which seems to work fine. Please suggest if there is any flaw in it:

for (ConsumerRecord<Integer, String> cr : records) {
                String str = cr.value();
                Gson gson = new Gson();
                Object dto = gson.fromJson(str, Object.class);
                System.out.println(dto);
            }
        }

edited Sep 12 '19 at 11:09

asked Sep 12 '19 at 06:18

DigitalHelper

I have edited it with the code. – DigitalHelper Sep 12 '19 at 06:39
1

Write a custom deserializer. – Prashant Pandey Sep 12 '19 at 06:41
The only generic types (built into Java) you can use are LinkedHashMap or TreeMap. Without showing your messages to us, that's the best you can do here... Also, please move Gson variable out of the loop – OneCricketeer Sep 12 '19 at 06:53
Or create a plain JsonObject https://stackoverflow.com/questions/4110664/gson-directly-convert-string-to-jsonobject-no-pojo – OneCricketeer Sep 12 '19 at 07:02
Why downvote? Instead you can ask questioner to modify the question. – Ashish Bhosle Sep 12 '19 at 07:09
As said by @PrashantPandey you may want to write custom SERDE – Ashish Bhosle Sep 12 '19 at 07:11
Thanks Prashant, cricket_007 and Ashish. I will try your suggestions and post here about which one worked. – DigitalHelper Sep 12 '19 at 08:31

Deserialize string value json to generic java object

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