java - "null" value failing to serialize -

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i using jersey client access rest service.

i using jsonobject , setting "null" literal in it. fails while serialized.

upon investigating, found jsonnull.equals() method has "null".equals(value) considers value jsonnull object.

and then, jsonnull#isempty() throws exceptions.

    net.sf.json.jsonobject params = new net.sf.json.jsonobject();     params.put("pghidentifie", "null");

and when serialized throws:

    caused by: com.sun.jersey.api.client.clienthandlerexception: org.codehaus.jackson.map.jsonmappingexception: object null (through reference chain: net.sf.json.jsonobject["pghidentifie"]->net.sf.json.jsonnull["empty"])

how can serialize "null" value inside jsonobject? thanks!

 defaultclientconfig defaultclientconfig = new defaultclientconfig();     defaultclientconfig.getclasses().add(jacksonjsonprovider.class);      client client = client.create(defaultclientconfig);     webresource webresource = client.resource(apiurl);     clientresponse response =                 webresource.path(apiurl).accept("application/json")                 .type("application/json").post(clientresponse.class, params);


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