http://netty.io/netty-all/: Netty is an asynchronous event-driven network application framework for rapid development of maintainable high performance protocol servers and clients. (The Netty Project) 
public interface io.netty.util.UncheckedBooleanSupplier extends io.netty.util.BooleanSupplier
  minor version: 0
  major version: 59
  flags: flags: (0x0601) ACC_PUBLIC, ACC_INTERFACE, ACC_ABSTRACT
  this_class: io.netty.util.UncheckedBooleanSupplier
  super_class: java.lang.Object
{
  public static final io.netty.util.UncheckedBooleanSupplier FALSE_SUPPLIER;
    descriptor: Lio/netty/util/UncheckedBooleanSupplier;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  public static final io.netty.util.UncheckedBooleanSupplier TRUE_SUPPLIER;
    descriptor: Lio/netty/util/UncheckedBooleanSupplier;
    flags: (0x0019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 32
            new io.netty.util.UncheckedBooleanSupplier$1
            dup
            invokespecial io.netty.util.UncheckedBooleanSupplier$1.<init>:()V
            putstatic io.netty.util.UncheckedBooleanSupplier.FALSE_SUPPLIER:Lio/netty/util/UncheckedBooleanSupplier;
         1: .line 42
            new io.netty.util.UncheckedBooleanSupplier$2
            dup
            invokespecial io.netty.util.UncheckedBooleanSupplier$2.<init>:()V
            putstatic io.netty.util.UncheckedBooleanSupplier.TRUE_SUPPLIER:Lio/netty/util/UncheckedBooleanSupplier;
         2: .line 47
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public abstract boolean get();
    descriptor: ()Z
    flags: (0x0401) ACC_PUBLIC, ACC_ABSTRACT
}
SourceFile: "UncheckedBooleanSupplier.java"
NestMembers:
  io.netty.util.UncheckedBooleanSupplier$1  io.netty.util.UncheckedBooleanSupplier$2
InnerClasses:
  io.netty.util.UncheckedBooleanSupplier$1
  io.netty.util.UncheckedBooleanSupplier$2