Deserialize list of Nodes

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Active Member

Deserialize list of Nodes

Dear Friends

I Get List of Nodes, then I can not deserialize json response, I get Error

com.fasterxml.jackson.databind.JsonMappingException: No suitable constructor found for type [simple type, class com.alfresco.client.api.common.representation.ResultPaging<com.alfresco.client.api.core.model.representation.NodeRepresentation>]: can not instantiate from JSON object (need to add/enable type information?)

Here is my code

HttpClient httpClient = HttpClientBuilder.create().build();
HttpGet get = new HttpGet("http://localhost:8080/alfresco/api/-default-/public/alfresco/versions/1/nodes/-shared-/children");
String alfrescoUser = "admin";
String pass = "admin";
UsernamePasswordCredentials creds = new UsernamePasswordCredentials(alfrescoUser, pass);
get.setHeader("Accept", "application/json");
get.setHeader("Content-type", "application/json");
get.setHeader(new BasicScheme().authenticate(creds, get, null));
HttpResponse response = httpClient.execute(get);
int statusCode = response.getStatusLine().getStatusCode();
if (statusCode != 200)
throw new RuntimeException("Failed with HTTP error code : " + statusCode);
HttpEntity httpEntity = response.getEntity();
String apiOutput = EntityUtils.toString(httpEntity);
Long total = null;
ObjectMapper om = new ObjectMapper();
om.configure(DeserializationFeature.FAIL_ON_UNKNOWN_PROPERTIES, false);
ResultPaging<NodeRepresentation> nodes = null;

nodes = om.readValue(apiOutput, new TypeReference<ResultPaging<NodeRepresentation>>() {});

Please, can you Help me?

2 Replies

Re: Deserialize list of Nodes

What is the scenario where you would be remotely calling the Alfresco API (in other words, running from a system other than Alfresco) and then wanting to deserialize JSON objects using classes that you should not have access to (ie, Alfresco's)?

If you are in a remote system you should be deserializing JSON responses into your own POJO's, not trying to reconstruct Alfresco's.

If you are calling the remote API from within Alfresco then you shouldn't be doing that either because you've got access to the native API.

Active Member

Re: Deserialize list of Nodes

Thank You Jeff

I solve this problem:

I am in a remote system and I create own POJO class -   Entry.class, then I extract information

List<EnrtyDTo> entryDTos= new ArrayList<EnrtyDTo>();

ObjectMapper om = new ObjectMapper();

JsonNode jsonNodeRoot = om.readTree(apiOutput);
List<JsonNode> nodes = jsonNodeRoot.findValues("entry");
for (JsonNode node : nodes) {
EnrtyDto entryDTo = om.treeToValue(node, EnrtyDto.class);

Thank All