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.MqttConnectPayload
  minor version: 0
  major version: 59
  flags: flags: (0x0031) ACC_PUBLIC, ACC_FINAL, ACC_SUPER
  this_class: io.netty.handler.codec.mqtt.MqttConnectPayload
  super_class: java.lang.Object
{
  private final java.lang.String clientIdentifier;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.lang.String willTopic;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final byte[] willMessage;
    descriptor: [B
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final java.lang.String userName;
    descriptor: Ljava/lang/String;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final byte[] password;
    descriptor: [B
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  public void <init>(java.lang.String, java.lang.String, java.lang.String, java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=7, locals=6, args_size=6
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
        start local 1 // java.lang.String clientIdentifier
        start local 2 // java.lang.String willTopic
        start local 3 // java.lang.String willMessage
        start local 4 // java.lang.String userName
        start local 5 // java.lang.String password
         0: .line 43
            aload 0 /* this */
         1: .line 44
            aload 1 /* clientIdentifier */
         2: .line 45
            aload 2 /* willTopic */
         3: .line 46
            aload 3 /* willMessage */
            getstatic io.netty.util.CharsetUtil.UTF_8:Ljava/nio/charset/Charset;
            invokevirtual java.lang.String.getBytes:(Ljava/nio/charset/Charset;)[B
         4: .line 47
            aload 4 /* userName */
         5: .line 48
            aload 5 /* password */
            getstatic io.netty.util.CharsetUtil.UTF_8:Ljava/nio/charset/Charset;
            invokevirtual java.lang.String.getBytes:(Ljava/nio/charset/Charset;)[B
            invokespecial io.netty.handler.codec.mqtt.MqttConnectPayload.<init>:(Ljava/lang/String;Ljava/lang/String;[BLjava/lang/String;[B)V
         6: .line 49
            return
        end local 5 // java.lang.String password
        end local 4 // java.lang.String userName
        end local 3 // java.lang.String willMessage
        end local 2 // java.lang.String willTopic
        end local 1 // java.lang.String clientIdentifier
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    7     0              this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;
            0    7     1  clientIdentifier  Ljava/lang/String;
            0    7     2         willTopic  Ljava/lang/String;
            0    7     3       willMessage  Ljava/lang/String;
            0    7     4          userName  Ljava/lang/String;
            0    7     5          password  Ljava/lang/String;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()
    MethodParameters:
                  Name  Flags
      clientIdentifier  
      willTopic         
      willMessage       
      userName          
      password          

  public void <init>(java.lang.String, java.lang.String, byte[], java.lang.String, byte[]);
    descriptor: (Ljava/lang/String;Ljava/lang/String;[BLjava/lang/String;[B)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=6, args_size=6
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
        start local 1 // java.lang.String clientIdentifier
        start local 2 // java.lang.String willTopic
        start local 3 // byte[] willMessage
        start local 4 // java.lang.String userName
        start local 5 // byte[] password
         0: .line 51
            aload 0 /* this */
            invokespecial java.lang.Object.<init>:()V
         1: .line 57
            aload 0 /* this */
            aload 1 /* clientIdentifier */
            putfield io.netty.handler.codec.mqtt.MqttConnectPayload.clientIdentifier:Ljava/lang/String;
         2: .line 58
            aload 0 /* this */
            aload 2 /* willTopic */
            putfield io.netty.handler.codec.mqtt.MqttConnectPayload.willTopic:Ljava/lang/String;
         3: .line 59
            aload 0 /* this */
            aload 3 /* willMessage */
            putfield io.netty.handler.codec.mqtt.MqttConnectPayload.willMessage:[B
         4: .line 60
            aload 0 /* this */
            aload 4 /* userName */
            putfield io.netty.handler.codec.mqtt.MqttConnectPayload.userName:Ljava/lang/String;
         5: .line 61
            aload 0 /* this */
            aload 5 /* password */
            putfield io.netty.handler.codec.mqtt.MqttConnectPayload.password:[B
         6: .line 62
            return
        end local 5 // byte[] password
        end local 4 // java.lang.String userName
        end local 3 // byte[] willMessage
        end local 2 // java.lang.String willTopic
        end local 1 // java.lang.String clientIdentifier
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot              Name  Signature
            0    7     0              this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;
            0    7     1  clientIdentifier  Ljava/lang/String;
            0    7     2         willTopic  Ljava/lang/String;
            0    7     3       willMessage  [B
            0    7     4          userName  Ljava/lang/String;
            0    7     5          password  [B
    MethodParameters:
                  Name  Flags
      clientIdentifier  
      willTopic         
      willMessage       
      userName          
      password          

  public java.lang.String clientIdentifier();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 65
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.clientIdentifier:Ljava/lang/String;
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;

  public java.lang.String willTopic();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 69
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.willTopic:Ljava/lang/String;
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;

  public java.lang.String willMessage();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 77
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.willMessage:[B
            ifnonnull 1
            aconst_null
            goto 2
      StackMap locals:
      StackMap stack:
         1: new java.lang.String
            dup
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.willMessage:[B
            getstatic io.netty.util.CharsetUtil.UTF_8:Ljava/nio/charset/Charset;
            invokespecial java.lang.String.<init>:([BLjava/nio/charset/Charset;)V
      StackMap locals:
      StackMap stack: java.lang.String
         2: areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()

  public byte[] willMessageInBytes();
    descriptor: ()[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 81
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.willMessage:[B
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;

  public java.lang.String userName();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 85
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.userName:Ljava/lang/String;
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;

  public java.lang.String password();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 93
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.password:[B
            ifnonnull 1
            aconst_null
            goto 2
      StackMap locals:
      StackMap stack:
         1: new java.lang.String
            dup
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.password:[B
            getstatic io.netty.util.CharsetUtil.UTF_8:Ljava/nio/charset/Charset;
            invokespecial java.lang.String.<init>:([BLjava/nio/charset/Charset;)V
      StackMap locals:
      StackMap stack: java.lang.String
         2: areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;
    RuntimeVisibleAnnotations: 
      java.lang.Deprecated()

  public byte[] passwordInBytes();
    descriptor: ()[B
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=1, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 97
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.password:[B
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;

  public java.lang.String toString();
    descriptor: ()Ljava/lang/String;
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=1, args_size=1
        start local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
         0: .line 102
            new java.lang.StringBuilder
            dup
            aload 0 /* this */
            invokestatic io.netty.util.internal.StringUtil.simpleClassName:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
         1: .line 103
            bipush 91
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         2: .line 104
            ldc "clientIdentifier="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.clientIdentifier:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         3: .line 105
            ldc ", willTopic="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.willTopic:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         4: .line 106
            ldc ", willMessage="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.willMessage:[B
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
         5: .line 107
            ldc ", userName="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.userName:Ljava/lang/String;
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
         6: .line 108
            ldc ", password="
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            aload 0 /* this */
            getfield io.netty.handler.codec.mqtt.MqttConnectPayload.password:[B
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/Object;)Ljava/lang/StringBuilder;
         7: .line 109
            bipush 93
            invokevirtual java.lang.StringBuilder.append:(C)Ljava/lang/StringBuilder;
         8: .line 110
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
         9: .line 102
            areturn
        end local 0 // io.netty.handler.codec.mqtt.MqttConnectPayload this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0   10     0  this  Lio/netty/handler/codec/mqtt/MqttConnectPayload;
}
SourceFile: "MqttConnectPayload.java"