Initial exception
org.springframework.http.converter.HttpMessageNotWritableException: No converter for [class com.cdw.common.core.model.Resp] with preset Content-Type 'text/json;charset=UTF-8'Solution:
Set ↓
resp.setContentType("text/json");Change to ↓
resp.setContentType("application/json");Then another exception occurs
java.lang.IllegalStateException: getOutputStream() has already been called for this responseSolution:
Set ↓
this.writeObjectToJson(resp, this.reportProviders);Change to ↓
this.writeObjectToJson(resp, JSONObject.toJSON(this.reportProviders));Full screenshot after modification:
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