java - Spring MVC: Is it possible to bind a specific HttpMessageConverter to a @RequestBody-annotated parameter? -

i have spring boot application default abstractjackson2httpmessageconverter. bound jackson objectmapper instance has custom simplemodule registered supports multimap google guava library.

@bean public objectmapper objectmapper() {     return new objectmapper()             .setserializationinclusion(non_null)             .configure(fail_on_unknown_properties, false)             .registermodule(new simplemodule()                     .addserializer(multimaptype, multimapduplicatekeysserializer)                     .adddeserializer(multimaptype, multimapjsondeserializer)             ); } 

and suppose have following method in controller:

@requestmapping(method = post) @responsestatus(ok) public object post(     @requestbody final multimap<string, object> multimap ) {     ... } 

at step fine. have validate multimap empty or blank keys, , return http 400 if there invalid keys found in incoming multimap. trivial operation , can done traversing incoming multimap , throwing exception handled in controller advice. has @ least next flaws:

• i don't want validate multimaps directly somewhere in controller or associated service.
• if it's flaw: couldn't make work spring mvc annotations @valid, @modelattribute etc, don't care these, because of following:
• i don't want multimap validated after it's deserialized, because validate incoming request body @ parser level somewhere in specific httpmessageconverter -- validation need purely json stream validation work big multimaps not requiring whole multimap deserialized before validation. if possible, of course.

is possible bind specific httpmessageconverter specific @requestbody only? like:

@requestmapping(method = post) @responsestatus(ok) public object post(     @somemagicspringannotationhere("specifichttpmessageconverter") @requestbody final multimap<string, object> multimap     or     @anothermagicspringannotationhere("specificobjectmapper") @requestbody final multimap<string, object> multimap     or     @whatevermagicspringannotationhere @requestbody final multimap<string, object> multimap ) {     ... } 

or wrong approach , can accomplished more spring-related , more elegant? suggestions appreciated. in advance!

create specialized annoation i.e @multimaprequestbody

@target(elementtype.parameter) @retention(retentionpolicy.runtime) @documented public @interface multimaprequestbody {      boolean required() default true; 

then create multimaprequestbodymethodargumentresolver knows do.

public class multimaprequestbodymethodargumentresolver implements handlermethodargumentresolver {      public  boolean supportsparameter(methodparameter parameter) {         return parameter.hasparameterannotation(multimaprequestbody.class); // maybe check argument type too.     }      public  object resolveargument(methodparameter parameter, modelandviewcontainer mavcontainer,         nativewebrequest webrequest, webdatabinderfactory binderfactory) throws exception {         // logic validation , converting using jackson         // take @ mappingjackson2httpmessageconverter      } } 

now can handle body conversion , validation yourself. might want take @ mappingjackson2httpmessageconverter inspiration on how read , parse body. or maybe extend 1 of abstract classes used argument conversion.

now in request handling method use @multimaprequestbody instead of @requestbody annotation.

@requestmapping(method = post) @responsestatus(ok) public object post(     @multimaprequestbody final multimap<string, object> multimap ) {     ... }