Minor follow-up to A JSON REST client in WebSphere 8.5

I needed to serialize/deserialize name-value properties, ideally into a Java Map. I had hoped this would automatically work, but it does not.

Useful search results


In my case, the JSON field in question is named ‘properties’. It contains name-value string pairs that I want to get into a Map. Inside my POJO, I define:

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

(See third link above, apparently need to initialize the Map explicitly.)

Then add the following methods, with Jackson-specific annotations:

    public Map<String, String> getProperties()  
        return properties;  

    public void add(String key, String value) {  
        properties.put(key, value);  

Then a JSON field like this:

      "properties":       {  
         "id": "12345",  
         "notes": "some notes"  

Will be deserialized by the Wink client Resource methods into my Map, to be accessed like this:

String id = myJsonResponseBean.getProperties().get("id");


  • Apparently only one JSON name/value field can be mapped in this way. But this is sufficient for my needs.
  • Regrettably, this is yet another dependency on proprietary APIs. I usually try to avoid those at all costs, but this JSON Client under WebSphere 8.5.5 now has at least 3 of them. There doesn’t appear to be an alternative at this point.
  • Surprisingly, my earlier technique of adding the @XmlType and @JsonIgnoreProperties(ignoreUnknown = true) annotations to a JsonBase class did not work here. I had to explicitly add those annotations to this POJO class.