TickEvent spawn anything (cause of arrow hits ground)

@SubscribeEvent
    public void tickupdate(TickEvent evt) {
        Random myrandomgen = new Random();


        for (Entity ee : entitylist) {
            boolean ground = false;



            if (!ee.isDead) {

                double lastposx = ee.lastTickPosX;
                double lastposy = ee.lastTickPosY;
                double lastposz = ee.lastTickPosZ;

                double currentx = ee.posX;
                double currenty = ee.posY;
                double currentz = ee.posZ;
                double diffx = 0;
                double diffy = 0;
                double diffz = 0;
                boolean differencemajor = false;

                //Get difference in X since last Tick
                if (lastposx > currentx) {
                    diffx = lastposx - currentx;
                }
                if (currentx > lastposx) {
                    diffx = currentx - lastposx;
                }

                //Get difference in Y since last Tick
                if (lastposy > currenty) {
                    diffy = lastposy - currenty;
                }
                if (currenty > lastposy) {
                    diffy = currenty - lastposy;
                }
                //Get difference in Z since last Tick
                if (lastposz > currentz) {
                    diffz = lastposz - currentz;
                }
                if (currentz > lastposz) {
                    diffz = currentz - lastposz;
                }

                if (diffx < 1) {
                    if (diffy < 1) {
                        if (diffz < 1) {
                            differencemajor = true;
                        }
                    }

                }


                if (thisplayer != null) {
                    if (thisplayer.getEntityWorld().isRemote == false) {
                        if (differencemajor == true) {
                            EntitySpider tntentity;
                            net.minecraft.entity.Entity thisarrow;
                            net.minecraft.world.World world;
                            world = ee.getEntityWorld();
                            thisarrow = ee;

                            tntentity = new EntitySpider(thisplayer.getEntityWorld());
                            tntentity.setLocationAndAngles(ee.posX, ee.posY, ee.posZ, 0, 0);
                            world.spawnEntityInWorld(tntentity);

                            for (int a=1;a<300;a++){
                                int posx = myrandomgen.nextInt(200);
                                int posy = myrandomgen.nextInt(30);
                                int posz = myrandomgen.nextInt(200);

                                double newx = (double)posx + ee.posX;
                                double newy = (double)posy + ee.posY;
                                double newz = (double)posz + ee.posZ;
                                tntentity = new EntitySpider(thisplayer.getEntityWorld());
                                tntentity.setLocationAndAngles(newx, newy, newz, 0, 0);
                                world.spawnEntityInWorld(tntentity);





                            }



                            ee.setDead();

                        }
                    }
                }


            }
        }
    }