https://projects.eclipse.org/projects/ee4j.grizzly/grizzly-websockets-server: Grizzly Bill of Materials (BOM) (Oracle Corporation) 
public abstract class org.glassfish.grizzly.http.io.NIOReader extends java.io.Reader implements org.glassfish.grizzly.InputSource
  minor version: 0
  major version: 59
  flags: flags: (0x0421) ACC_PUBLIC, ACC_SUPER, ACC_ABSTRACT
  this_class: org.glassfish.grizzly.http.io.NIOReader
  super_class: java.io.Reader
{
  public void <init>();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // org.glassfish.grizzly.http.io.NIOReader this
         0: .line 28
            aload 0 /* this */
            invokespecial java.io.Reader.<init>:()V
            return
        end local 0 // org.glassfish.grizzly.http.io.NIOReader this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lorg/glassfish/grizzly/http/io/NIOReader;
}
SourceFile: "NIOReader.java"