PacketPlayOutWorldParticles help

I'm trying to play particles threw the packet PacketPlayOutWorldParticles, but I'm not having much luck.

This is my code so far, everytime I run it it D/Cs my game and gives me the error:

"Internal Exception: io.netty.handler.codec.DecoderException:
java.lang.IndexOutOfBoundsException: readerIndex(1) + length(4)
exceeds writerIndex(1): UnpooledHeapByteBuf(ridx: 1, widx: 1, cap: 1)"

Code:

PacketPlayOutWorldParticles particles = new PacketPlayOutWorldParticles();
                       
                        for (Field field : particles.getClass().getDeclaredFields())
                        {
                            try
                            {
                                field.setAccessible(true);
                                String fieldName = field.getName();
                                switch (fieldName)
                                {
                                // dunno what it wants here
                                case "a":
                                    field.set(particles, null);
                                    break;
                                 // float
                                case "b":
                                    field.set(particles, 0F);
                                    break;
                                 // float
                                case "c":
                                    field.set(particles, 0F);
                                    break;
                                 // float
                                case "d":
                                    field.set(particles, 0F);
                                    break;
                                 // float
                                case "e":
                                    field.set(particles, 0F);
                                    break;
                                 // float
                                case "f":
                                    field.set(particles, 0F);
                                    break;
                                 // float
                                case "g":
                                    field.set(particles, 0F);
                                    break;
                                 // float
                                case "h":
                                    field.set(particles, 0F);
                                    break;
                                 // int
                                case "i":
                                    field.set(particles, 0);
                                    break;
                                 // boolean
                                case "j":
                                    field.set(particles, true);
                                    break;
                                 // int[]
                                case "k":
                                    field.set(particles, ef);
                                    break;
                                }         
                            }catch(Exception e){
                                player.sendMessage(e.getMessage());
                            }
                        }
                        cPlayer.getHandle().playerConnection.sendPacket(particles);

Any push / help in the right direction would be great. Thank you.

 

@DarkFuzzyCookie
When handling packets, you should use Protocol Lib. It will make using packets a lot easier.

You can find the parameters for all packets using at this link. Find your packet, and add all the correct objects to the parameter: https://bukkit.org/threads/packetplayout-constructors.397793/