https://github.com/google/guava/guava: Guava is a suite of core and expanded libraries that include utility classes, google's collections, io classes, and much much more. 
final class com.google.common.io.ByteSource$EmptyByteSource extends com.google.common.io.ByteSource$ByteArrayByteSource
  minor version: 0
  major version: 59
  flags: flags: (0x0030) ACC_FINAL, ACC_SUPER
  this_class: com.google.common.io.ByteSource$EmptyByteSource
  super_class: com.google.common.io.ByteSource$ByteArrayByteSource
{
  static final com.google.common.io.ByteSource$EmptyByteSource INSTANCE;
    descriptor: Lcom/google/common/io/ByteSource$EmptyByteSource;
    flags: (0x0018) ACC_STATIC, ACC_FINAL

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=2, locals=0, args_size=0
         0: .line 642
            new com.google.common.io.ByteSource$EmptyByteSource
            dup
            invokespecial com.google.common.io.ByteSource$EmptyByteSource.<init>:()V
            putstatic com.google.common.io.ByteSource$EmptyByteSource.INSTANCE:Lcom/google/common/io/ByteSource$EmptyByteSource;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  void <init>();
    descriptor: ()V
    flags: (0x0000) 
    Code:
      stack=2, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$EmptyByteSource this
         0: .line 645
            aload 0 /* this */
            iconst_0
            newarray 8
            invokespecial com.google.common.io.ByteSource$ByteArrayByteSource.<init>:([B)V
         1: .line 646
            return
        end local 0 // com.google.common.io.ByteSource$EmptyByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lcom/google/common/io/ByteSource$EmptyByteSource;

  public com.google.common.io.CharSource asCharSource(java.nio.charset.Charset);
    descriptor: (Ljava/nio/charset/Charset;)Lcom/google/common/io/CharSource;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=2, args_size=2
        start local 0 // com.google.common.io.ByteSource$EmptyByteSource this
        start local 1 // java.nio.charset.Charset charset
         0: .line 650
            aload 1 /* charset */
            invokestatic com.google.common.base.Preconditions.checkNotNull:(Ljava/lang/Object;)Ljava/lang/Object;
            pop
         1: .line 651
            invokestatic com.google.common.io.CharSource.empty:()Lcom/google/common/io/CharSource;
            areturn
        end local 1 // java.nio.charset.Charset charset
        end local 0 // com.google.common.io.ByteSource$EmptyByteSource this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    2     0     this  Lcom/google/common/io/ByteSource$EmptyByteSource;
            0    2     1  charset  Ljava/nio/charset/Charset;
    MethodParameters:
         Name  Flags
      charset  

  public byte[] read();
    descriptor: ()[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$EmptyByteSource this
         0: .line 656
            aload 0 /* this */
            getfield com.google.common.io.ByteSource$EmptyByteSource.bytes:[B
            areturn
        end local 0 // com.google.common.io.ByteSource$EmptyByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/ByteSource$EmptyByteSource;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // com.google.common.io.ByteSource$EmptyByteSource this
         0: .line 661
            ldc "ByteSource.empty()"
            areturn
        end local 0 // com.google.common.io.ByteSource$EmptyByteSource this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lcom/google/common/io/ByteSource$EmptyByteSource;
}
SourceFile: "ByteSource.java"
NestHost: com.google.common.io.ByteSource
InnerClasses:
  private ByteArrayByteSource = com.google.common.io.ByteSource$ByteArrayByteSource of com.google.common.io.ByteSource
  private final EmptyByteSource = com.google.common.io.ByteSource$EmptyByteSource of com.google.common.io.ByteSource