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Question

Getting an Exception when calling look()

  • 26 July 2019
  • 4 replies
  • 167 views
M

I follow the direction below, as recommended by Looker, to generate my Java SDK:







I am able to successfully call on allLooks(), and runLook() just fine. However, when I call on look(), I am getting this exception:



com.fasterxml.jackson.databind.JsonMappingException: Can not deserialize instance of java.lang.String out of START_OBJECT token


at [Source: sun.net.www.protocol.http.HttpURLConnection$HttpInputStream@3b77a04f; line: 1, column: 3798] (through reference chain: io.swagger.client.model.LookWithQuery[“query”]->io.swagger.client.model.Query[“vis_config”])



My sample Java code:



private void resetFilters(LookApi lookApi, ArrayList<LooksData> looks) {		





    try {


    	


    	LookWithQuery thisLook = lookApi.look(Long.valueOf(50), null); 


    	


    } catch (Exception e) {        	


    	System.out.println("Exception: " + e);        


    }    	


	


}


I looked at the generated Java classes and it appeared that the LookWithQuery class contains Query which has visConfig defined as:



private Map<String, String> visConfig = new HashMap<String, String>();



I am thinking that may be the exception is resulted from the returned json containing visConfig not being a map of String,String?



Has anyone see this error before?

4 replies

izzy
Userlevel 7
Badge +1

I think you actually may have to nest with parentheses. So query(vis_config). I am admittedly not totally sure about that, but see if it resolves and let us know!

M

Hello Izzy,



Thank you for responding back.



Can you clarify further on your suggestion?



So, the LookApi class has the method look() defined as followed:



public LookWithQuery look(Long lookId, String fields) throws ApiException



The returned LookWithQuery class contains the Query object as:



public class LookWithQuery {


private Query query = null;



The Query class defines visConfig as:



public class Query {


private Long id = null;


private Map<String, String> visConfig = new HashMap<String, String>();



Note that all of the above classes are generated automatically by swagger-codegen. How are you suggesting I should change?

David_Stocker

I’m seeing the same problem. It looks like vis_config is a map rather than a string, like the swagger generated SDK expects. I’m interested in learning a good solution too.

izzy
Userlevel 7
Badge +1

Just checked in with our engineers, and it looks like this is related to a bug we’re working on fixing. Basically, the collection is tagged as a string in the API spec that feeds the generator, when really it’s a JSON object that’s being passed as a string. It’s on us to correct that type annotation so that it functions as expected, and we’re working on it.



In the meantime, you could try explicitly converting that part of the payload with a different deserializer.



I’ll update here when it’s fixed/released.

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