YawPitch

public static void setYawAndPitch(Entity en, float newYaw, float newPitch){
        try{
           String path = Bukkit.getServer().getClass().getPackage().getName();
           String version = path.substring(path.lastIndexOf(".") + 1, path.length());
           Class<?> EntityLivingClass = Class.forName("net.minecraft.server." + version +".EntityLiving");
           Class<?> CraftEntityClass = Class.forName("org.bukkit.craftbukkit." + version +".entity.CraftEntity");
           Method getHandle = CraftEntityClass.getMethod("getHandle", new Class<?>[0]);
           Object craftEntityObject = CraftEntityClass.cast(en);
           Object entityLivingObject = EntityLivingClass.cast(getHandle.invoke(craftEntityObject, new Object[0]));
           Field yawField = EntityLivingClass.getField("yaw");
           yawField.setFloat(entityLivingObject, newYaw);
           Field pitchField = EntityLivingClass.getField("pitch");
           pitchField.setFloat(entityLivingObject, newPitch);
        }catch(Exception ex){
            ex.printStackTrace();
        }
}