gson - Why spring mvc automatically add GsonHttpMessageConverter? -

i want use gson in web application.when config gsonhttpmessageconverter in webconfig extend webmvcconfigureradapter,i found strang problem，that before add gsonhttpmessageconverter converters in extendmessageconverters,there 1 in converters,and 1 not have config date style. enter image description here why happen? want gsonhttpmessageconverter have date style "yyyy-mm-dd hh:mm:ss",how can it?

spring automatically creates gsonhttpmessageconverter if detects gson in classpath.

to customize converter creating own, can override following method in webmvcconfigurationsupport:

@override public void configuremessageconverters(list<httpmessageconverter<?>> converters) {     gson gson = new gsonbuilder().setdateformat("yyyy-mm-dd hh:mm:ss").create();     gsonhttpmessageconverter gsonhttpmessageconverter = new gsonhttpmessageconverter();     gsonhttpmessageconverter.setgson(gson);     converters.add(gsonhttpmessageconverter); }