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 final class io.netty.handler.codec.mqtt.MqttMessageType extends java.lang.Enum<io.netty.handler.codec.mqtt.MqttMessageType>
  minor version: 0
  major version: 59
  flags: flags: (0x4031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER, ACC_ANNOTATION
  this_class: io.netty.handler.codec.mqtt.MqttMessageType
  super_class: java.lang.Enum
{
  public static final io.netty.handler.codec.mqtt.MqttMessageType CONNECT;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType CONNACK;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PUBLISH;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PUBACK;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PUBREC;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PUBREL;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PUBCOMP;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType SUBSCRIBE;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType SUBACK;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType UNSUBSCRIBE;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType UNSUBACK;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PINGREQ;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType PINGRESP;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  public static final io.netty.handler.codec.mqtt.MqttMessageType DISCONNECT;
    descriptor: Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x4019) ACC_PUBLIC, ACC_STATIC, ACC_FINAL, ACC_ANNOTATION

  private final int value;
    descriptor: I
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private static final io.netty.handler.codec.mqtt.MqttMessageType[] ENUM$VALUES;
    descriptor: [Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x101a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL, ACC_SYNTHETIC

  static void <clinit>();
    descriptor: ()V
    flags: (0x0008) ACC_STATIC
    Code:
      stack=5, locals=0, args_size=0
         0: .line 23
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "CONNECT"
            iconst_0
            iconst_1
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.CONNECT:Lio/netty/handler/codec/mqtt/MqttMessageType;
         1: .line 24
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "CONNACK"
            iconst_1
            iconst_2
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.CONNACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
         2: .line 25
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PUBLISH"
            iconst_2
            iconst_3
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBLISH:Lio/netty/handler/codec/mqtt/MqttMessageType;
         3: .line 26
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PUBACK"
            iconst_3
            iconst_4
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
         4: .line 27
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PUBREC"
            iconst_4
            iconst_5
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBREC:Lio/netty/handler/codec/mqtt/MqttMessageType;
         5: .line 28
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PUBREL"
            iconst_5
            bipush 6
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBREL:Lio/netty/handler/codec/mqtt/MqttMessageType;
         6: .line 29
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PUBCOMP"
            bipush 6
            bipush 7
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBCOMP:Lio/netty/handler/codec/mqtt/MqttMessageType;
         7: .line 30
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "SUBSCRIBE"
            bipush 7
            bipush 8
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.SUBSCRIBE:Lio/netty/handler/codec/mqtt/MqttMessageType;
         8: .line 31
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "SUBACK"
            bipush 8
            bipush 9
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.SUBACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
         9: .line 32
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "UNSUBSCRIBE"
            bipush 9
            bipush 10
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.UNSUBSCRIBE:Lio/netty/handler/codec/mqtt/MqttMessageType;
        10: .line 33
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "UNSUBACK"
            bipush 10
            bipush 11
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.UNSUBACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
        11: .line 34
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PINGREQ"
            bipush 11
            bipush 12
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PINGREQ:Lio/netty/handler/codec/mqtt/MqttMessageType;
        12: .line 35
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "PINGRESP"
            bipush 12
            bipush 13
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.PINGRESP:Lio/netty/handler/codec/mqtt/MqttMessageType;
        13: .line 36
            new io.netty.handler.codec.mqtt.MqttMessageType
            dup
            ldc "DISCONNECT"
            bipush 13
            bipush 14
            invokespecial io.netty.handler.codec.mqtt.MqttMessageType.<init>:(Ljava/lang/String;II)V
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.DISCONNECT:Lio/netty/handler/codec/mqtt/MqttMessageType;
        14: .line 22
            bipush 14
            anewarray io.netty.handler.codec.mqtt.MqttMessageType
            dup
            iconst_0
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.CONNECT:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            iconst_1
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.CONNACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            iconst_2
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBLISH:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            iconst_3
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            iconst_4
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBREC:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            iconst_5
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBREL:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 6
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PUBCOMP:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 7
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.SUBSCRIBE:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 8
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.SUBACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 9
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.UNSUBSCRIBE:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 10
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.UNSUBACK:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 11
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PINGREQ:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 12
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.PINGRESP:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            dup
            bipush 13
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.DISCONNECT:Lio/netty/handler/codec/mqtt/MqttMessageType;
            aastore
            putstatic io.netty.handler.codec.mqtt.MqttMessageType.ENUM$VALUES:[Lio/netty/handler/codec/mqtt/MqttMessageType;
            return
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  private void <init>(java.lang.String, int, int);
    descriptor: (Ljava/lang/String;II)V
    flags: (0x0002) ACC_PRIVATE
    Code:
      stack=3, locals=4, args_size=4
        start local 0 // io.netty.handler.codec.mqtt.MqttMessageType this
        start local 3 // int value
         0: .line 40
            aload 0 /* this */
            aload 1
            iload 2
            invokespecial java.lang.Enum.<init>:(Ljava/lang/String;I)V
         1: .line 41
            aload 0 /* this */
            iload 3 /* value */
            putfield io.netty.handler.codec.mqtt.MqttMessageType.value:I
         2: .line 42
            return
        end local 3 // int value
        end local 0 // io.netty.handler.codec.mqtt.MqttMessageType this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lio/netty/handler/codec/mqtt/MqttMessageType;
            0    3     3  value  I
    MethodParameters:
               Name  Flags
      $enum$name     
      $enum$ordinal  
      value          

  public int value();
    descriptor: ()I
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttMessageType this
         0: .line 45
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttMessageType.value:I
            ireturn
        end local 0 // io.netty.handler.codec.mqtt.MqttMessageType this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttMessageType;

  public static io.netty.handler.codec.mqtt.MqttMessageType valueOf(int);
    descriptor: (I)Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=5, args_size=1
        start local 0 // int type
         0: .line 49
            invokestatic io.netty.handler.codec.mqtt.MqttMessageType.values:()[Lio/netty/handler/codec/mqtt/MqttMessageType;
            dup
            astore 4
            arraylength
            istore 3
            iconst_0
            istore 2
            goto 5
      StackMap locals: int top int int io.netty.handler.codec.mqtt.MqttMessageType[]
      StackMap stack:
         1: aload 4
            iload 2
            aaload
            astore 1 /* t */
        start local 1 // io.netty.handler.codec.mqtt.MqttMessageType t
         2: .line 50
            aload 1 /* t */
            getfield io.netty.handler.codec.mqtt.MqttMessageType.value:I
            iload 0 /* type */
            if_icmpne 4
         3: .line 51
            aload 1 /* t */
            areturn
        end local 1 // io.netty.handler.codec.mqtt.MqttMessageType t
         4: .line 49
      StackMap locals:
      StackMap stack:
            iinc 2 1
      StackMap locals:
      StackMap stack:
         5: iload 2
            iload 3
            if_icmplt 1
         6: .line 54
            new java.lang.IllegalArgumentException
            dup
            new java.lang.StringBuilder
            dup
            ldc "unknown message type: "
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            iload 0 /* type */
            invokevirtual java.lang.StringBuilder.append:(I)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokespecial java.lang.IllegalArgumentException.<init>:(Ljava/lang/String;)V
            athrow
        end local 0 // int type
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  type  I
            2    4     1     t  Lio/netty/handler/codec/mqtt/MqttMessageType;
    MethodParameters:
      Name  Flags
      type  

  public static io.netty.handler.codec.mqtt.MqttMessageType[] values();
    descriptor: ()[Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=5, locals=3, args_size=0
         0: .line 1
            getstatic io.netty.handler.codec.mqtt.MqttMessageType.ENUM$VALUES:[Lio/netty/handler/codec/mqtt/MqttMessageType;
            dup
            astore 0
            iconst_0
            aload 0
            arraylength
            dup
            istore 1
            anewarray io.netty.handler.codec.mqtt.MqttMessageType
            dup
            astore 2
            iconst_0
            iload 1
            invokestatic java.lang.System.arraycopy:(Ljava/lang/Object;ILjava/lang/Object;II)V
            aload 2
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature

  public static io.netty.handler.codec.mqtt.MqttMessageType valueOf(java.lang.String);
    descriptor: (Ljava/lang/String;)Lio/netty/handler/codec/mqtt/MqttMessageType;
    flags: (0x0009) ACC_PUBLIC, ACC_STATIC
    Code:
      stack=2, locals=1, args_size=1
         0: .line 1
            ldc Lio/netty/handler/codec/mqtt/MqttMessageType;
            aload 0
            invokestatic java.lang.Enum.valueOf:(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;
            checkcast io.netty.handler.codec.mqtt.MqttMessageType
            areturn
      LocalVariableTable:
        Start  End  Slot  Name  Signature
    MethodParameters:
      Name  Flags
      name  
}
Signature: Ljava/lang/Enum<Lio/netty/handler/codec/mqtt/MqttMessageType;>;
SourceFile: "MqttMessageType.java"