STRING to ArrayList<String> using TypeReference

Question

str = "[tdr1w6v, tdr1w77]";
ObjectMapper objectMapper = new ObjectMapper();
JavaType type = objectMapper.getTypeFactory().
                constructCollectionType(ArrayList.class, String.class);
ArrayList<String> list = null;
        try {
            list = objectMapper.readValue(str,
                    new TypeReference<ArrayList<String>>(){});
        } catch (IOException e) {
            e.printStackTrace();
        }

Here an exception is thrown :

com.fasterxml.jackson.core.JsonParseException: Unrecognized token 'tdr1w6v': was expecting 'null', 'true', 'false' or NaN

How can I convert str to ArrayList of string ?

It seems that this is not proper JSON. Where do you get it from? Try with "[\"tdr1w6v\", \"tdr1w77\"]";. — Pshemo
– Pshemo, Commented Sep 10, 2015 at 17:51
Actually I mapped JSONArray to ArrayList<String> and dumped the ArrayList<String>.toString to db. — Viveran
– Viveran, Commented Sep 10, 2015 at 17:52
Convert JSONArray to string representing valid JSON structure if you want to retrieve it back using JSON parser. From which package JSONArray comes from? — Pshemo
– Pshemo, Commented Sep 10, 2015 at 17:55
{"path": [ "tdr1w6v", "tdr1w77" ]} Map it to ArrayList<String> path. Then use the model class to create a DAO and push data to data base. In the mapper for DAO implementation, I convert it to path.toString(). That is the format in which this method saves in db. — Viveran
– Viveran, Commented Sep 10, 2015 at 18:02
You can probably get the answer [here][1] [1]: stackoverflow.com/questions/7347856/… — pmartin8
– pmartin8, Commented Sep 10, 2015 at 18:02

Viveran · Accepted Answer · 2015-09-11 09:51:40Z

3

@FedericoPeraltaSchaffner suggestion helped. Now what I do is, in my binder class use objectMapper.writeValueAsString to convert data to store in database. And in my Mapper class while reading from data base I can use the same way as in the question:

ObjectMapper objectMapper = new ObjectMapper();
ArrayList<String> list = null;
try {
        list =objectMapper.readValue(str, new TypeReference<ArrayList<String>>(){});
    } catch (IOException e) {
        e.printStackTrace();
    }

So now I don't have to create a separate DTO class, I can use the same model at service layer and DAO.

edited Sep 11, 2015 at 9:51

answered Sep 11, 2015 at 9:28

Viveran

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Comments

seahawk · Accepted Answer · 2015-09-10 19:07:51Z

1

The requirement can be easily met without using TypeReference

String str="[tdr1w6v, tdr1w77]";
List<String> al=Arrays.asList(str.replaceAll("[\\[\\]]","").split(","));
System.out.println(al);

answered Sep 10, 2015 at 19:07

seahawk

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1 Comment

Viveran Over a year ago

Thanks. Your answer is same as suggested by @pmartin8.

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