java - org.springframework.http.converter.HttpMessageNotWritableException -


i using gson maven dependency , apns maven dependency (com.notnoop.apns version 0.2.3 creating error, using version 0.1.6 fine methods want not available here) , want response in json format only, converting tostring() change whole project response 

root cause: com.fasterxml.jackson.databind.jsonmappingexception: jsonobject (through reference chain: com.google.gson.jsonobject["asstring"])  root cause: java.lang.unsupportedoperationexception: jsonobject


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