//use this code to get the angle in degrees, ive changed it so it reverses the angle to oopsite of facing entitiy

double var16 = this.posX - this.entityToAttack.posX;
               double var18 = this.posZ - this.entityToAttack.posZ;
               this.rotationYaw = (float)(Math.atan2(var18, var16) * 180.0D / 3.1415927410125732D) - 90.0F;



//now, using that angle, get a new relative position based on your entities coords, fyi center = this, in your case

//offset angle
float look = 0F;
//distance, might wanna use 8 or something
double dist = 1F;

double gatherX = center.posX + ((double)(-Math.sin((center.rotationYaw+look) / 180.0F * 3.1415927F) * Math.cos(center.rotationPitch / 180.0F * 3.1415927F)) * dist);

double gatherY = center.posY-0.5 + (double)(-MathHelper.sin(center.rotationPitch / 180.0F * 3.1415927F) * dist) - 0D; //center.posY - 0D;

double gatherZ = center.posZ + ((double)(Math.cos((center.rotationYaw+look) / 180.0F * 3.1415927F) * Math.cos(center.rotationPitch / 180.0F * 3.1415927F)) * dist);

//now you have coords to try, do basic checks like if its a valid movable to location then pathfind to it