https://github.com/eclipse-vertx/vertx-sql-client: The Reactive PostgreSQL client (Eclipse) 
class io.vertx.pgclient.impl.codec.InitCommandCodec extends io.vertx.pgclient.impl.codec.PgCommandCodec<io.vertx.sqlclient.impl.Connection, io.vertx.sqlclient.impl.command.InitCommand>
  minor version: 0
  major version: 59
  flags: flags: (0x0020) ACC_SUPER
  this_class: io.vertx.pgclient.impl.codec.InitCommandCodec
  super_class: io.vertx.pgclient.impl.codec.PgCommandCodec
{
  private io.vertx.pgclient.impl.codec.PgEncoder encoder;
    descriptor: Lio/vertx/pgclient/impl/codec/PgEncoder;
    flags: (0x0002) ACC_PRIVATE

  private java.lang.String encoding;
    descriptor: Ljava/lang/String;
    flags: (0x0002) ACC_PRIVATE

  void <init>(io.vertx.sqlclient.impl.command.InitCommand);
    descriptor: (Lio/vertx/sqlclient/impl/command/InitCommand;)V
    flags: (0x0000) 
    Code:
      stack=2, locals=2, args_size=2
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // io.vertx.sqlclient.impl.command.InitCommand cmd
         0: .line 34
            aload 0 /* this */
            aload 1 /* cmd */
            invokespecial io.vertx.pgclient.impl.codec.PgCommandCodec.<init>:(Lio/vertx/sqlclient/impl/command/CommandBase;)V
         1: .line 35
            return
        end local 1 // io.vertx.sqlclient.impl.command.InitCommand cmd
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    2     0  this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0    2     1   cmd  Lio/vertx/sqlclient/impl/command/InitCommand;
    MethodParameters:
      Name  Flags
      cmd   

  void encode(io.vertx.pgclient.impl.codec.PgEncoder);
    descriptor: (Lio/vertx/pgclient/impl/codec/PgEncoder;)V
    flags: (0x0000) 
    Code:
      stack=6, locals=2, args_size=2
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // io.vertx.pgclient.impl.codec.PgEncoder encoder
         0: .line 39
            aload 0 /* this */
            aload 1 /* encoder */
            putfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoder:Lio/vertx/pgclient/impl/codec/PgEncoder;
         1: .line 40
            aload 1 /* encoder */
            new io.vertx.pgclient.impl.codec.StartupMessage
            dup
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.username:()Ljava/lang/String;
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.database:()Ljava/lang/String;
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.properties:()Ljava/util/Map;
            invokespecial io.vertx.pgclient.impl.codec.StartupMessage.<init>:(Ljava/lang/String;Ljava/lang/String;Ljava/util/Map;)V
            invokevirtual io.vertx.pgclient.impl.codec.PgEncoder.writeStartupMessage:(Lio/vertx/pgclient/impl/codec/StartupMessage;)V
         2: .line 41
            return
        end local 1 // io.vertx.pgclient.impl.codec.PgEncoder encoder
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    3     0     this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0    3     1  encoder  Lio/vertx/pgclient/impl/codec/PgEncoder;
    MethodParameters:
         Name  Flags
      encoder  

  public void handleAuthenticationMD5Password(byte[]);
    descriptor: ([B)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=2, args_size=2
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // byte[] salt
         0: .line 45
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoder:Lio/vertx/pgclient/impl/codec/PgEncoder;
            new io.vertx.pgclient.impl.codec.PasswordMessage
            dup
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.username:()Ljava/lang/String;
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.password:()Ljava/lang/String;
            aload 1 /* salt */
            invokespecial io.vertx.pgclient.impl.codec.PasswordMessage.<init>:(Ljava/lang/String;Ljava/lang/String;[B)V
            invokevirtual io.vertx.pgclient.impl.codec.PgEncoder.writePasswordMessage:(Lio/vertx/pgclient/impl/codec/PasswordMessage;)V
         1: .line 46
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoder:Lio/vertx/pgclient/impl/codec/PgEncoder;
            invokevirtual io.vertx.pgclient.impl.codec.PgEncoder.flush:()V
         2: .line 47
            return
        end local 1 // byte[] salt
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0    3     1  salt  [B
    MethodParameters:
      Name  Flags
      salt  

  public void handleAuthenticationClearTextPassword();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=6, locals=1, args_size=1
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
         0: .line 51
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoder:Lio/vertx/pgclient/impl/codec/PgEncoder;
            new io.vertx.pgclient.impl.codec.PasswordMessage
            dup
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.username:()Ljava/lang/String;
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.password:()Ljava/lang/String;
            aconst_null
            invokespecial io.vertx.pgclient.impl.codec.PasswordMessage.<init>:(Ljava/lang/String;Ljava/lang/String;[B)V
            invokevirtual io.vertx.pgclient.impl.codec.PgEncoder.writePasswordMessage:(Lio/vertx/pgclient/impl/codec/PasswordMessage;)V
         1: .line 52
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoder:Lio/vertx/pgclient/impl/codec/PgEncoder;
            invokevirtual io.vertx.pgclient.impl.codec.PgEncoder.flush:()V
         2: .line 53
            return
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;

  public void handleAuthenticationOk();
    descriptor: ()V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=0, locals=1, args_size=1
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
         0: .line 59
            return
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    1     0  this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;

  public void handleParameterStatus(java.lang.String, java.lang.String);
    descriptor: (Ljava/lang/String;Ljava/lang/String;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // java.lang.String key
        start local 2 // java.lang.String value
         0: .line 63
            aload 1 /* key */
            ldc "client_encoding"
            invokevirtual java.lang.String.equals:(Ljava/lang/Object;)Z
            ifeq 2
         1: .line 64
            aload 0 /* this */
            aload 2 /* value */
            putfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoding:Ljava/lang/String;
         2: .line 66
      StackMap locals:
      StackMap stack:
            return
        end local 2 // java.lang.String value
        end local 1 // java.lang.String key
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    3     0   this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0    3     1    key  Ljava/lang/String;
            0    3     2  value  Ljava/lang/String;
    MethodParameters:
       Name  Flags
      key    
      value  

  public void handleBackendKeyData(int, int);
    descriptor: (II)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // int processId
        start local 2 // int secretKey
         0: .line 70
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.connection:()Lio/vertx/sqlclient/impl/SocketConnectionBase;
            checkcast io.vertx.pgclient.impl.PgSocketConnection
            iload 1 /* processId */
            putfield io.vertx.pgclient.impl.PgSocketConnection.processId:I
         1: .line 71
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.connection:()Lio/vertx/sqlclient/impl/SocketConnectionBase;
            checkcast io.vertx.pgclient.impl.PgSocketConnection
            iload 2 /* secretKey */
            putfield io.vertx.pgclient.impl.PgSocketConnection.secretKey:I
         2: .line 72
            return
        end local 2 // int secretKey
        end local 1 // int processId
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot       Name  Signature
            0    3     0       this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0    3     1  processId  I
            0    3     2  secretKey  I
    MethodParameters:
           Name  Flags
      processId  
      secretKey  

  public void handleErrorResponse(io.vertx.pgclient.impl.codec.ErrorResponse);
    descriptor: (Lio/vertx/pgclient/impl/codec/ErrorResponse;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=2
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // io.vertx.pgclient.impl.codec.ErrorResponse errorResponse
         0: .line 76
            aload 1 /* errorResponse */
            invokevirtual io.vertx.pgclient.impl.codec.ErrorResponse.toException:()Lio/vertx/pgclient/PgException;
            invokestatic io.vertx.sqlclient.impl.command.CommandResponse.failure:(Ljava/lang/Throwable;)Lio/vertx/sqlclient/impl/command/CommandResponse;
            astore 2 /* resp */
        start local 2 // io.vertx.sqlclient.impl.command.CommandResponse resp
         1: .line 77
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.completionHandler:Lio/vertx/core/Handler;
            aload 2 /* resp */
            invokeinterface io.vertx.core.Handler.handle:(Ljava/lang/Object;)V
         2: .line 78
            return
        end local 2 // io.vertx.sqlclient.impl.command.CommandResponse resp
        end local 1 // io.vertx.pgclient.impl.codec.ErrorResponse errorResponse
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot           Name  Signature
            0    3     0           this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0    3     1  errorResponse  Lio/vertx/pgclient/impl/codec/ErrorResponse;
            1    3     2           resp  Lio/vertx/sqlclient/impl/command/CommandResponse<Lio/vertx/sqlclient/impl/Connection;>;
    MethodParameters:
               Name  Flags
      errorResponse  

  public void handleReadyForQuery(io.vertx.sqlclient.impl.TxStatus);
    descriptor: (Lio/vertx/sqlclient/impl/TxStatus;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=4, args_size=2
        start local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
        start local 1 // io.vertx.sqlclient.impl.TxStatus txStatus
         0: .line 85
            aconst_null
            astore 2 /* cs */
        start local 2 // java.nio.charset.Charset cs
         1: .line 87
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoding:Ljava/lang/String;
            invokestatic java.nio.charset.Charset.forName:(Ljava/lang/String;)Ljava/nio/charset/Charset;
            astore 2 /* cs */
         2: .line 88
            goto 4
      StackMap locals: io.vertx.pgclient.impl.codec.InitCommandCodec io.vertx.sqlclient.impl.TxStatus java.nio.charset.Charset
      StackMap stack: java.lang.Exception
         3: pop
         4: .line 91
      StackMap locals:
      StackMap stack:
            aload 2 /* cs */
            ifnull 5
            aload 2 /* cs */
            getstatic java.nio.charset.StandardCharsets.UTF_8:Ljava/nio/charset/Charset;
            invokevirtual java.nio.charset.Charset.equals:(Ljava/lang/Object;)Z
            ifne 7
         5: .line 92
      StackMap locals:
      StackMap stack:
            new java.lang.StringBuilder
            dup
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.encoding:Ljava/lang/String;
            invokestatic java.lang.String.valueOf:(Ljava/lang/Object;)Ljava/lang/String;
            invokespecial java.lang.StringBuilder.<init>:(Ljava/lang/String;)V
            ldc " is not supported in the client only UTF8"
            invokevirtual java.lang.StringBuilder.append:(Ljava/lang/String;)Ljava/lang/StringBuilder;
            invokevirtual java.lang.StringBuilder.toString:()Ljava/lang/String;
            invokestatic io.vertx.sqlclient.impl.command.CommandResponse.failure:(Ljava/lang/String;)Lio/vertx/sqlclient/impl/command/CommandResponse;
            astore 3 /* fut */
        start local 3 // io.vertx.sqlclient.impl.command.CommandResponse fut
         6: .line 93
            goto 8
        end local 3 // io.vertx.sqlclient.impl.command.CommandResponse fut
         7: .line 94
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.cmd:Lio/vertx/sqlclient/impl/command/CommandBase;
            checkcast io.vertx.sqlclient.impl.command.InitCommand
            invokevirtual io.vertx.sqlclient.impl.command.InitCommand.connection:()Lio/vertx/sqlclient/impl/SocketConnectionBase;
            invokestatic io.vertx.sqlclient.impl.command.CommandResponse.success:(Ljava/lang/Object;)Lio/vertx/sqlclient/impl/command/CommandResponse;
            astore 3 /* fut */
        start local 3 // io.vertx.sqlclient.impl.command.CommandResponse fut
         8: .line 96
      StackMap locals: io.vertx.sqlclient.impl.command.CommandResponse
      StackMap stack:
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.codec.InitCommandCodec.completionHandler:Lio/vertx/core/Handler;
            aload 3 /* fut */
            invokeinterface io.vertx.core.Handler.handle:(Ljava/lang/Object;)V
         9: .line 97
            return
        end local 3 // io.vertx.sqlclient.impl.command.CommandResponse fut
        end local 2 // java.nio.charset.Charset cs
        end local 1 // io.vertx.sqlclient.impl.TxStatus txStatus
        end local 0 // io.vertx.pgclient.impl.codec.InitCommandCodec this
      LocalVariableTable:
        Start  End  Slot      Name  Signature
            0   10     0      this  Lio/vertx/pgclient/impl/codec/InitCommandCodec;
            0   10     1  txStatus  Lio/vertx/sqlclient/impl/TxStatus;
            1   10     2        cs  Ljava/nio/charset/Charset;
            6    7     3       fut  Lio/vertx/sqlclient/impl/command/CommandResponse<Lio/vertx/sqlclient/impl/Connection;>;
            8   10     3       fut  Lio/vertx/sqlclient/impl/command/CommandResponse<Lio/vertx/sqlclient/impl/Connection;>;
      Exception table:
        from    to  target  type
           1     2       3  Class java.lang.Exception
    MethodParameters:
          Name  Flags
      txStatus  
}
Signature: Lio/vertx/pgclient/impl/codec/PgCommandCodec<Lio/vertx/sqlclient/impl/Connection;Lio/vertx/sqlclient/impl/command/InitCommand;>;
SourceFile: "InitCommandCodec.java"