How to add a custom exception on symfony2

Question

I am new to Symfony(using version 2.2) and trying to add a custom exception listener. I have read the following links but cannot get it to work.

What I'm trying to do is to create a custom Error Exception Listener and use it from my controllers and services like this,

throw new jsonErrorException('invalid_params');

to display json twig template like this.(I'm developing a background program for my native smartphone applications)

{"status": "error", "message": "invalid_params"}

I have registered my CustomEventListener to my src/My/Bundle/Resources/config/services.yml and created a custom exception class as shown on following link(Overriding Symfony 2 exceptions?) but I get the error

symfony exceptions must be valid objects derived from the exception base class

Am I doing something wrong here? Thanks.

Paul Valla · Accepted Answer · 2013-04-19 08:38:12Z

26

You can create custom exception the "symfony way" let's look at how exception or created in symfony:

first create your customExceptionInterface

namespace My\SymfonyBundle\Exception;
/**
 * Interface for my bundle exceptions.
 */
interface MySymfonyBundleExceptionInterface
{
}

And create your jsonErrorException

namespace My\SymfonyBundle\Exception;

class HttpException extends \Exception implements MySymfonyBundleExceptionInterface
{
}

Don't hesitate to browse symfony's exceptions code examples on github

answered Apr 19, 2013 at 8:38

Paul Valla

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3 Comments

Kyosuke Nakajima Over a year ago

Thanks for helping! I'm almost there but I can't find out how to render a custom twig template. (I don't need to use twig, since it's not a long text, but I prefer using it)

Paul Valla Over a year ago

twig configuration to stop rendering the default twig template.

Kyosuke Nakajima Over a year ago

Thank you for the help! I figured out a way to render specific twig template by editing the Exception Listener. link you gave me also helped!

aalaap · Accepted Answer · 2016-07-05 07:40:17Z

6

I recently implemented a custom exception in my Symfony2 service in the following manner:

MemberAlreadyExistsException.php

<?php

namespace Aalaap\MyAppBundle\Services\Membership;

class MemberAlreadyExistsException extends \Exception
{

}

Subscriber.php

<?php

namespace Aalaap\MyAppBundle\Services\Membership;
...
throw new MemberAlreadyExistsException(
    'The member you are trying to subscribe already'
    . ' exists in this list.'
);
...

answered Jul 5, 2016 at 7:40

aalaap

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1 Comment

crafter Over a year ago

Quick and simple.

Ivan Yonkov · Accepted Answer · 2013-04-19 07:59:36Z

0

You have to extend the Exception class, or at least the Symfony's inner exception class

answered Apr 19, 2013 at 7:59

Ivan Yonkov

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Comments

michalzuber · Accepted Answer · 2017-05-17 07:19:19Z

0

I just had to add \ and the global scope worked in a Symfony service

namespace App\CoreBundle\Service;

class CurrencyExchange
{
    const RATES_XML = 'https://www.ecb.europa.eu/stats/eurofxref/eurofxref-daily.xml?849b4b329863b2d60bfd0de486e423c9';

    const RATES_XML_PATH = 'uploads/ecb_currencies.xml';

    /** @var array $rates */
    private $rates;

    public function __construct()
    {
        if (!is_file(self::RATES_XML_PATH)) {
            throw new \Exception('XML '.self::RATES_XML_PATH.' does not exists.');
        }

        if (1 > filesize(self::RATES_XML_PATH)) {
            throw new \Exception('XML '.self::RATES_XML_PATH.' is empty.');
        }

answered May 17, 2017 at 7:19

michalzuber

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