https://openjdk.java.net/ 
public interface jdk.internal.net.http.frame.FramesDecoder$FrameProcessor
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: jdk.internal.net.http.frame.FramesDecoder$FrameProcessor
  super_class: java.lang.Object
{
  public abstract void processFrame(jdk.internal.net.http.frame.Http2Frame);
    descriptor: (Ljdk/internal/net/http/frame/Http2Frame;)V
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
    Exceptions:
      throws java.io.IOException
    MethodParameters:
       Name  Flags
      frame  
}
SourceFile: "FramesDecoder.java"
NestHost: jdk.internal.net.http.frame.FramesDecoder
InnerClasses:
  public abstract FrameProcessor = jdk.internal.net.http.frame.FramesDecoder$FrameProcessor of jdk.internal.net.http.frame.FramesDecoder
    RuntimeVisibleAnnotations: 
      java.lang.FunctionalInterface()