https://github.com/spring-projects/spring-framework: Spring Web (Spring IO)
  • Juergen Hoeller 
public interface org.springframework.web.method.support.AsyncHandlerMethodReturnValueHandler extends org.springframework.web.method.support.HandlerMethodReturnValueHandler
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: org.springframework.web.method.support.AsyncHandlerMethodReturnValueHandler
  super_class: java.lang.Object
{
  public abstract boolean isAsyncReturnValue(java.lang.Object, org.springframework.core.MethodParameter);
    descriptor: (Ljava/lang/Object;Lorg/springframework/core/MethodParameter;)Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    RuntimeVisibleParameterAnnotations: 
      0:
        org.springframework.lang.Nullable()
      1:
    MethodParameters:
             Name  Flags
      returnValue  
      returnType   
}
SourceFile: "AsyncHandlerMethodReturnValueHandler.java"