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// goal: to add custom message in case of error, not get rid of exception itself // main exception, whicn need to get through to UI with custom message: Caused by: com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value at com.fasterxml.jackson.core.JsonGenerator._reportError(JsonGenerator.java:1961) at com.fasterxml.jackson.core.json.UTF8JsonGenerator.writeFieldName(UTF8JsonGenerator.java:188) // final catch of exception after which it ignored org.springframework.http.converter.HttpMessageNotWritableException: Could not write JSON: Can not write a field name, expecting a value; nested exception is com.fasterxml.jackson.core.JsonGenerationException: Can not write a field name, expecting a value at org.springframework.http.converter.json.AbstractJackson2HttpMessageConverter.writeInternal(AbstractJackson2HttpMessageConverter.java:296) // endpoint in the controller // exception happens when we try to serialize SettingsObject into json @RequestMapping(value = "", method = RequestMethod.GET) public Wrapper<SettingsObject> getConfig(HttpServletRequest request) // import com.fasterxml.jackson.databind.annotation.JsonDeserialize; import com.fasterxml.jackson.databind.annotation.JsonSerialize; @JsonSerialize(using = WrapperSerializer.class) @JsonDeserialize(using = WrapperDeserializer.class) public class Wrapper<V>
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