**[Dave Syer](https://jira.spring.io/secure/ViewProfile.jspa?name=david_syer)** opened **[SPR-15410](https://jira.spring.io/browse/SPR-15410?redirect=false)** and commented The constructor signature changed here: https://github.com/spring-projects/spring-framework/blob/master/spring-webmvc/src/main/java/org/springframework/web/servlet/mvc/method/annotation/ResponseBodyEmitterReturnValueHandler.java#L65 so there's no way to compile an implementation withSpring 4.3 and run with Spring 5. Probably we could keep the old constructor and add a new one? --- **Affects:** 5.0 RC1 **Referenced from:** commits https://github.com/spring-projects/spring-framework/commit/de6f34893a8fd329822aec3a7875440b2eb86624
