https://github.com/eclipse-vertx/vertx-sql-client: The Reactive PostgreSQL Client (Eclipse) 
public class io.vertx.pgclient.impl.InitiateSslHandler extends io.netty.channel.ChannelInboundHandlerAdapter
  minor version: 0
  major version: 59
  flags: flags: (0x0021) ACC_PUBLIC, ACC_SUPER
  this_class: io.vertx.pgclient.impl.InitiateSslHandler
  super_class: io.netty.channel.ChannelInboundHandlerAdapter
{
  private static final int code;
    descriptor: I
    flags: (0x001a) ACC_PRIVATE, ACC_STATIC, ACC_FINAL
    ConstantValue: 80877103

  private final io.vertx.sqlclient.impl.SocketConnectionBase conn;
    descriptor: Lio/vertx/sqlclient/impl/SocketConnectionBase;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL

  private final io.vertx.core.Promise<java.lang.Void> upgradePromise;
    descriptor: Lio/vertx/core/Promise;
    flags: (0x0012) ACC_PRIVATE, ACC_FINAL
    Signature: Lio/vertx/core/Promise<Ljava/lang/Void;>;

  public void <init>(io.vertx.sqlclient.impl.SocketConnectionBase, io.vertx.core.Promise<java.lang.Void>);
    descriptor: (Lio/vertx/sqlclient/impl/SocketConnectionBase;Lio/vertx/core/Promise;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=3, args_size=3
        start local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
        start local 1 // io.vertx.sqlclient.impl.SocketConnectionBase conn
        start local 2 // io.vertx.core.Promise upgradePromise
         0: .line 38
            aload 0 /* this */
            invokespecial io.netty.channel.ChannelInboundHandlerAdapter.<init>:()V
         1: .line 39
            aload 0 /* this */
            aload 1 /* conn */
            putfield io.vertx.pgclient.impl.InitiateSslHandler.conn:Lio/vertx/sqlclient/impl/SocketConnectionBase;
         2: .line 40
            aload 0 /* this */
            aload 2 /* upgradePromise */
            putfield io.vertx.pgclient.impl.InitiateSslHandler.upgradePromise:Lio/vertx/core/Promise;
         3: .line 41
            return
        end local 2 // io.vertx.core.Promise upgradePromise
        end local 1 // io.vertx.sqlclient.impl.SocketConnectionBase conn
        end local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
      LocalVariableTable:
        Start  End  Slot            Name  Signature
            0    4     0            this  Lio/vertx/pgclient/impl/InitiateSslHandler;
            0    4     1            conn  Lio/vertx/sqlclient/impl/SocketConnectionBase;
            0    4     2  upgradePromise  Lio/vertx/core/Promise<Ljava/lang/Void;>;
    Signature: (Lio/vertx/sqlclient/impl/SocketConnectionBase;Lio/vertx/core/Promise<Ljava/lang/Void;>;)V
    MethodParameters:
                Name  Flags
      conn            
      upgradePromise  

  public void channelActive(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=3, locals=3, args_size=2
        start local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 45
            invokestatic io.netty.buffer.Unpooled.buffer:()Lio/netty/buffer/ByteBuf;
            astore 2 /* byteBuf */
        start local 2 // io.netty.buffer.ByteBuf byteBuf
         1: .line 46
            aload 2 /* byteBuf */
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.writeInt:(I)Lio/netty/buffer/ByteBuf;
            pop
         2: .line 47
            aload 2 /* byteBuf */
            ldc 80877103
            invokevirtual io.netty.buffer.ByteBuf.writeInt:(I)Lio/netty/buffer/ByteBuf;
            pop
         3: .line 49
            aload 2 /* byteBuf */
            iconst_0
            aload 2 /* byteBuf */
            invokevirtual io.netty.buffer.ByteBuf.writerIndex:()I
            invokevirtual io.netty.buffer.ByteBuf.setInt:(II)Lio/netty/buffer/ByteBuf;
            pop
         4: .line 50
            aload 1 /* ctx */
            aload 2 /* byteBuf */
            invokeinterface io.netty.channel.ChannelHandlerContext.writeAndFlush:(Ljava/lang/Object;)Lio/netty/channel/ChannelFuture;
            pop
         5: .line 51
            aload 0 /* this */
            aload 1 /* ctx */
            invokespecial io.netty.channel.ChannelInboundHandlerAdapter.channelActive:(Lio/netty/channel/ChannelHandlerContext;)V
         6: .line 52
            return
        end local 2 // io.netty.buffer.ByteBuf byteBuf
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0    7     0     this  Lio/vertx/pgclient/impl/InitiateSslHandler;
            0    7     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            1    7     2  byteBuf  Lio/netty/buffer/ByteBuf;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  public void channelRead(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=4, locals=6, args_size=3
        start local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Object msg
         0: .line 57
            aload 2 /* msg */
            checkcast io.netty.buffer.ByteBuf
            astore 3 /* byteBuf */
        start local 3 // io.netty.buffer.ByteBuf byteBuf
         1: .line 58
            aload 3 /* byteBuf */
            iconst_0
            invokevirtual io.netty.buffer.ByteBuf.getByte:(I)B
            istore 4 /* b */
        start local 4 // byte b
         2: .line 59
            aload 3 /* byteBuf */
            invokevirtual io.netty.buffer.ByteBuf.release:()Z
            pop
         3: .line 60
            iload 4 /* b */
            lookupswitch { // 2
                   78: 7
                   83: 4
              default: 9
          }
         4: .line 62
      StackMap locals: io.netty.buffer.ByteBuf int
      StackMap stack:
            aload 0 /* this */
            aload 1 /* ctx */
            invokedynamic handle(Lio/vertx/pgclient/impl/InitiateSslHandler;Lio/netty/channel/ChannelHandlerContext;)Lio/vertx/core/Handler;
              Bootstrap: invokestatic java.lang.invoke.LambdaMetafactory.metafactory:(Ljava/lang/invoke/MethodHandles$Lookup;Ljava/lang/String;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodType;Ljava/lang/invoke/MethodHandle;Ljava/lang/invoke/MethodType;)Ljava/lang/invoke/CallSite;
                Method arguments:
                  (Ljava/lang/Object;)V
                  io/vertx/pgclient/impl/InitiateSslHandler.lambda$0(Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V (7)
                  (Ljava/lang/Object;)V
            astore 5 /* handler */
        start local 5 // io.vertx.core.Handler handler
         5: .line 73
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.InitiateSslHandler.conn:Lio/vertx/sqlclient/impl/SocketConnectionBase;
            invokevirtual io.vertx.sqlclient.impl.SocketConnectionBase.socket:()Lio/vertx/core/net/impl/NetSocketInternal;
            aload 5 /* handler */
            invokeinterface io.vertx.core.net.impl.NetSocketInternal.upgradeToSsl:(Lio/vertx/core/Handler;)Lio/vertx/core/net/NetSocket;
            pop
         6: .line 74
            goto 10
        end local 5 // io.vertx.core.Handler handler
         7: .line 77
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.InitiateSslHandler.upgradePromise:Lio/vertx/core/Promise;
            new java.lang.Exception
            dup
            ldc "Postgres Server does not handle SSL connection"
            invokespecial java.lang.Exception.<init>:(Ljava/lang/String;)V
            invokeinterface io.vertx.core.Promise.fail:(Ljava/lang/Throwable;)V
         8: .line 78
            goto 10
         9: .line 81
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.InitiateSslHandler.upgradePromise:Lio/vertx/core/Promise;
            new java.lang.Exception
            dup
            ldc "Invalid SSL connection message"
            invokespecial java.lang.Exception.<init>:(Ljava/lang/String;)V
            invokeinterface io.vertx.core.Promise.fail:(Ljava/lang/Throwable;)V
        10: .line 84
      StackMap locals:
      StackMap stack:
            return
        end local 4 // byte b
        end local 3 // io.netty.buffer.ByteBuf byteBuf
        end local 2 // java.lang.Object msg
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
      LocalVariableTable:
        Start  End  Slot     Name  Signature
            0   11     0     this  Lio/vertx/pgclient/impl/InitiateSslHandler;
            0   11     1      ctx  Lio/netty/channel/ChannelHandlerContext;
            0   11     2      msg  Ljava/lang/Object;
            1   11     3  byteBuf  Lio/netty/buffer/ByteBuf;
            2   11     4        b  B
            5    7     5  handler  Lio/vertx/core/Handler;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   
      msg   

  public void exceptionCaught(io.netty.channel.ChannelHandlerContext, java.lang.Throwable);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Throwable;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=2, locals=4, args_size=3
        start local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
        start local 2 // java.lang.Throwable cause
         0: .line 88
            aload 2 /* cause */
            instanceof io.netty.handler.codec.DecoderException
            ifeq 3
         1: .line 89
            aload 2 /* cause */
            checkcast io.netty.handler.codec.DecoderException
            astore 3 /* err */
        start local 3 // io.netty.handler.codec.DecoderException err
         2: .line 90
            aload 3 /* err */
            invokevirtual io.netty.handler.codec.DecoderException.getCause:()Ljava/lang/Throwable;
            astore 2 /* cause */
        end local 3 // io.netty.handler.codec.DecoderException err
         3: .line 92
      StackMap locals:
      StackMap stack:
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.InitiateSslHandler.upgradePromise:Lio/vertx/core/Promise;
            aload 2 /* cause */
            invokeinterface io.vertx.core.Promise.tryFail:(Ljava/lang/Throwable;)Z
            pop
         4: .line 93
            return
        end local 2 // java.lang.Throwable cause
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
      LocalVariableTable:
        Start  End  Slot   Name  Signature
            0    5     0   this  Lio/vertx/pgclient/impl/InitiateSslHandler;
            0    5     1    ctx  Lio/netty/channel/ChannelHandlerContext;
            0    5     2  cause  Ljava/lang/Throwable;
            2    3     3    err  Lio/netty/handler/codec/DecoderException;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
       Name  Flags
      ctx    
      cause  

  public void channelInactive(io.netty.channel.ChannelHandlerContext);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;)V
    flags: (0x0001) ACC_PUBLIC
    Code:
      stack=5, locals=2, args_size=2
        start local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
        start local 1 // io.netty.channel.ChannelHandlerContext ctx
         0: .line 97
            aload 0 /* this */
            aload 1 /* ctx */
            invokespecial io.netty.channel.ChannelInboundHandlerAdapter.channelInactive:(Lio/netty/channel/ChannelHandlerContext;)V
         1: .line 99
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.InitiateSslHandler.upgradePromise:Lio/vertx/core/Promise;
            new io.vertx.core.VertxException
            dup
            ldc "SSL handshake failed"
            iconst_1
            invokespecial io.vertx.core.VertxException.<init>:(Ljava/lang/String;Z)V
            invokeinterface io.vertx.core.Promise.tryFail:(Ljava/lang/Throwable;)Z
            pop
         2: .line 100
            return
        end local 1 // io.netty.channel.ChannelHandlerContext ctx
        end local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    3     0  this  Lio/vertx/pgclient/impl/InitiateSslHandler;
            0    3     1   ctx  Lio/netty/channel/ChannelHandlerContext;
    Exceptions:
      throws java.lang.Exception
    MethodParameters:
      Name  Flags
      ctx   

  private void lambda$0(io.netty.channel.ChannelHandlerContext, java.lang.Object);
    descriptor: (Lio/netty/channel/ChannelHandlerContext;Ljava/lang/Object;)V
    flags: (0x1002) ACC_PRIVATE, ACC_SYNTHETIC
    Code:
      stack=2, locals=4, args_size=3
        start local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
        start local 2 // java.lang.Object o
         0: .line 63
            aload 2 /* o */
            instanceof io.vertx.core.AsyncResult
            ifeq 4
         1: .line 64
            aload 2 /* o */
            checkcast io.vertx.core.AsyncResult
            astore 3 /* res */
        start local 3 // io.vertx.core.AsyncResult res
         2: .line 65
            aload 3 /* res */
            invokeinterface io.vertx.core.AsyncResult.failed:()Z
            ifeq 4
         3: .line 67
            return
        end local 3 // io.vertx.core.AsyncResult res
         4: .line 70
      StackMap locals:
      StackMap stack:
            aload 1
            invokeinterface io.netty.channel.ChannelHandlerContext.pipeline:()Lio/netty/channel/ChannelPipeline;
            aload 0 /* this */
            invokeinterface io.netty.channel.ChannelPipeline.remove:(Lio/netty/channel/ChannelHandler;)Lio/netty/channel/ChannelPipeline;
            pop
         5: .line 71
            aload 0 /* this */
            getfield io.vertx.pgclient.impl.InitiateSslHandler.upgradePromise:Lio/vertx/core/Promise;
            invokeinterface io.vertx.core.Promise.complete:()V
         6: .line 72
            return
        end local 2 // java.lang.Object o
        end local 0 // io.vertx.pgclient.impl.InitiateSslHandler this
      LocalVariableTable:
        Start  End  Slot  Name  Signature
            0    7     0  this  Lio/vertx/pgclient/impl/InitiateSslHandler;
            0    7     2     o  Ljava/lang/Object;
            2    4     3   res  Lio/vertx/core/AsyncResult;
}
SourceFile: "InitiateSslHandler.java"
InnerClasses:
  public final Lookup = java.lang.invoke.MethodHandles$Lookup of java.lang.invoke.MethodHandles