java - How can I call the class's default Jackson serializer from inside custom serializer for that class? -

this question has answer here:

• jackson custom jsonserializer - conditionally call default serializer 1 answer
• how access default jackson serialization in custom serializer 1 answer

i need write custom jackson json serializer class following:

• if object iscustomjson(), should encoded string "custom" (obviously, assuming object's class has boolean iscustomjson() method)
• if object isn't iscustomjson(), should encoded using default jackson json serializer class have been used if didn't have registered custom serializer.

i'm guessing code this:

public class itemserializer extends stdserializer<item> { // add boilerplate     @override     public void serialize (         item value, jsongenerator jgen, serializerprovider provider) { // add throws         if (value.iscustomjson()) {             jgen.writestring("custom");         } else {             jgen.needtowritestandardencodedjsonserialization(value);             // profit???          }     } } 

how implement jgen.needtowritestandardencodedjsonserialization(value); piece?

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_{side note: in case i'm wrestling x-y problem, reason behind doing weird logic need add support old api in code, expects different json encoding default 1 class structure provides, due class restructuring in server (old code can't changed include new class structure). approach to: 1. detect old api request; 2. flag old api in data via iscustomjson() , 3. write custom jackson json serializer outputs json old api can understand; while letting requests new api use default normal json serializer default class. if x-y problem; please center answers around "how technically achieve asked" since want know answer not solve problem improve knowledge of jackson}