SPRINGMVC Back to JSON debugging

spring-web-5.0.6.release.jar!/org/springframework/web/method/support/ Handlermethodreturnvaluehandlercomposite.class

public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws Exception {        HandlerMethodReturnValueHandler handler = this.selectHandler(returnValue, returnType);        if (handler == null) {            throw new IllegalArgumentException("Unknown return value type: " + returnType.getParameterType().getName());        } else {            handler.handleReturnValue(returnValue, returnType, mavContainer, webRequest);        }    }

spring-webmvc-5.0.6.release.jar!/org/springframework/web/servlet/mvc/method/annotation/ Requestresponsebodymethodprocessor.class

    public void handleReturnValue(@Nullable Object returnValue, MethodParameter returnType, ModelAndViewContainer mavContainer, NativeWebRequest webRequest) throws IOException, HttpMediaTypeNotAcceptableException, HttpMessageNotWritableException {        mavContainer.setRequestHandled(true);        ServletServerHttpRequest inputMessage = this.createInputMessage(webRequest);        ServletServerHttpResponse outputMessage = this.createOutputMessage(webRequest);        this.writeWithMessageConverters(returnValue, returnType, inputMessage, outputMessage);    }

spring-webmvc-5.0.6.release.jar!/org/springframework/web/servlet/mvc/method/annotation/ Abstractmessageconvertermethodprocessor.class

protected <T> void Writewithmessageconverters (@Nullable T value, Methodparameter returntype, Servletserverhttprequest inputmessage, Servletserverhttpresponse outputmessage) throws IOException,        Httpmediatypenotacceptableexception, httpmessagenotwritableexception {Object outputvalue;        Class ValueType;        Object Declaredtype;            if (value instanceof charsequence) {outputvalue = Value.tostring ();            ValueType = String.class;        Declaredtype = String.class;            } else {outputvalue = value;            ValueType = This.getreturnvaluetype (value, returntype);        Declaredtype = This.getgenerictype (returntype); } if (This.isresourcetype (value, ReturnType)) {outputmessage.getheaders (). Set ("Accept-ranges", "bytes")            ; if (value! = null && inputmessage.getheaders (). GetFirst ("Range")! = null) {Resource Resource = (Re                source) value;               try {     list

Serializes the object.
Jackson-databind-2.9.5-sources.jar!/com/fasterxml/jackson/databind/ser/beanserializer.java

public final void serialize(Object bean, JsonGenerator gen, SerializerProvider provider) throws IOException { if (_objectIdWriter != null) { gen.setCurrentValue(bean); // [databind#631] _serializeWithObjectId(bean, gen, provider, true); return; } gen.writeStartObject(bean); if (_propertyFilterId != null) { serializeFieldsFiltered(bean, gen, provider); } else { serializeFields(bean, gen, provider); } gen.writeEndObject(); }

The field of the serialized object.
Jackson-databind-2.9.5-sources.jar!/com/fasterxml/jackson/databind/ser/std/beanserializerbase.java

protected void Serializefields (Object bean, Jsongenerator gen, Serializerprovider provider) throws IOException { Final beanpropertywriter[] props; if (_filteredprops! = null && provider.getactiveview () = null) {props = _filteredprops; } else {props = _props; } int i = 0; try {for (final int len = props.length; i < Len; ++i) {Beanpropertywriter prop = Props[i]; if (prop! = null) {//Can has nulls in filtered list Prop.serializeasfield (Bean, Gen, Provider); }} if (_anygetterwriter! = null) {_anygetterwriter.getandserialize (bean, Gen, provi der); }} catch (Exception e) {String name = (i = = props.length)? "[Anysetter]": props[i].getname (); Wrapandthrow (provider, E, Bean, name); } catch (Stackoverflowerror e) {//04-sep-2009, TAtu:dealing with the tricky, since we don't have many//stacks frames to spare ... just one or both; Can ' t make many calls. 10-DEC-2015, Tatu:and due to above, avoid ' from ' method, call ctor directly://jsonmappingexception MapE = Jsonmappingexception.from (Gen, "Infinite recursion (Stackoverflowerror)", e); Jsonmappingexception MapE = new Jsonmappingexception (gen, "Infinite recursion (Stackoverflowerror)", e); String name = (i = = props.length)? "[Anysetter]": props[i].getname (); Mape.prependpath (New Jsonmappingexception.reference (bean, name)); Throw MapE; } }

Serialize a field
Jackson-databind-2.9.5-sources.jar!/com/fasterxml/jackson/databind/ser/beanpropertywriter.java

public void Serializeasfield (Object bean, Jsongenerator gen, Serializerprovider Prov) throws Exception { inlined ' Get () ' final Object value = (_accessormethod = = null)? _field.get (Bean): _accessormethod.invoke (Bean, (object[]) null); Null handling is bit different, check that first if (value = = null) {if (_nullserializer! = null) { Gen.writefieldname (_name); _nullserializer.serialize (null, gen, Prov); } return; }/Then find serializer-use jsonserializer<object> ser = _serializer; if (Ser = = null) {class<?> CLS = Value.getclass (); Propertyserializermap m = _dynamicserializers; Ser = m.serializerfor (CLS); if (Ser = = null) {Ser = _findandadddynamic (M, CLS, Prov); }}//And then see if we must suppress certain values (default, empty) if (_suppressablevalue! = null) {if (Marker_for_empty = = _suppressablevalue) {if (ser.ise Mpty (Prov, value)) {return; }} else if (_suppressablevalue.equals (value)) {return; }}//For non-nulls:simple check for direct cycles if (value = = Bean) {//three choices : Exception; handled by call; or pass-through if (_handleselfreference (Bean, gen, Prov, Ser)) {return; }} gen.writefieldname (_name); if (_typeserializer = = null) {ser.serialize (value, gen, Prov); } else {Ser.serializewithtype (value, gen, Prov, _typeserializer); } }

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