How to use Exception / own Exception in laravel? - php

Question

I'd like to know what went wrong is it.
I want to use own Exception in try catch but I can't catch it.
Or maybe I catch it but is not what I want.
My php version is 7.4.30, laravel is 6.20.44.
Here is my code , I write a api to find a product , it's a get method.
api route
Route::get('/product/{id}', 'ProductCategoryController#find');
Execption
<?php
namespace App\Exceptions;
use Exception;
class ProductException extends Exception
{
public function render()
{
return response()->json([
'status' => 404,
'message' => 'product not found',
], 404);
}
}
Service
public static function find($id)
{
$product = ProductCategory::find($id);
if (!$product) {
throw new ProductException('ProductException', 400);
}
}
Controller
public function find($id)
{
return $this->ProductCategoryService->find($id);
try {
return $this->ProductCategoryService->find($id);
} catch (ProductException $e) {
return response()->json(['message' => $e->getMessage(), 'code' => $e->getCode()], 400);
}
}
I want to know my controller just use
return $this->ProductCategoryService->find($id);
I can get my onw exception response like this
When I commented off change to use try catch i will get
Why try catch catch exception is catch I throw parameters not catch
public function render()
{
return response()->json([
'status' => 404,
'message' => 'product not found',
], 404);
}
I want to know how it happened? and how to fix it
Thanks