Juan Ramos created GEODE-7259:
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             Summary: Function Execution Through REST API Limitation
                 Key: GEODE-7259
                 URL: https://issues.apache.org/jira/browse/GEODE-7259
             Project: Geode
          Issue Type: Bug
          Components: docs, rest (dev)
            Reporter: Juan Ramos


Function execution through the {{REST API}} doesn't support nested collections 
as part of the parameters, this is an undocumented limitation.
We basically try to convert the {{JSON}} parameters into a {{Map}} and 
afterwards, based on the {{Map}} contents and the {{@type}} value within the 
JSON string, convert that into the actual {{Object[]}} parameters expected by 
the function. If any of those objects contain an inner collection ([] as JSON) 
or object ({} as JSON), the initial parsing will always fail:

{code:title=AbstractBaseController.java|borderStyle=solid}
private Map<?, ?> convertJsonToMap(final String jsonString) {
    Map<String, String> map = new HashMap<String, String>();

    // convert JSON string to Map
    try {
      map = objectMapper.readValue(jsonString, new 
TypeReference<HashMap<String, String>>() {});
    } catch (JsonParseException e) {
      throw new MalformedJsonException(
          "Bind params specified as JSON document in the request is 
incorrect!", e);
    } catch (JsonMappingException e) {
      throw new MalformedJsonException(
          "Server unable to process bind params specified as JSON document in 
the request!", e);
    } catch (IOException e) {
      throw new GemfireRestException("Server has encountered error while 
process this request!", e);
    }
    return map;
  }
{code}



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