UPGRADE FROM 4.1 to 4.2

Cache

Deprecated CacheItem::getPreviousTags(), use CacheItem::getMetadata() instead.

Config

Deprecated constructing a TreeBuilder without passing root node information.

Console

Deprecated the setCrossingChar() method in favor of the setDefaultCrossingChar() method in TableStyle.
Deprecated the setHorizontalBorderChar() method in favor of the setDefaultCrossingChars() method in TableStyle.
Deprecated the getHorizontalBorderChar() method in favor of the getBorderChars() method in TableStyle.
Deprecated the setVerticalBorderChar() method in favor of the setVerticalBorderChars() method in TableStyle.
Deprecated the getVerticalBorderChar() method in favor of the getBorderChars() method in TableStyle.
Deprecated passing a command as a string to ProcessHelper::run(), pass it the command as an array of arguments instead.

Before:
```
$processHelper->run($output, 'ls -l');
```
After:
```
$processHelper->run($output, array('ls', '-l'));
```

DoctrineBridge

The lazy attribute on doctrine.event_listener tags was removed. Listeners are now lazy by default. So any lazy attributes can safely be removed from those tags.

Form

Deprecated calling FormRenderer::searchAndRenderBlock for fields which were already rendered. Instead of expecting such calls to return empty strings, check if the field has already been rendered.

Before:

{% for field in fieldsWithPotentialDuplicates %}
   {{ form_widget(field) }}
{% endfor %}

After:

{% for field in fieldsWithPotentialDuplicates if not field.rendered %}
   {{ form_widget(field) }}
{% endfor %}

Process

Deprecated the Process::setCommandline() and the PhpProcess::setPhpBinary() methods.
Deprecated passing commands as strings when creating a Process instance.

Before:
```
$process = new Process('ls -l');
```
After:
```
$process = new Process(array('ls', '-l'));
```

Security

Using the has_role() function in security expressions is deprecated, use the is_granted() function instead.
Not returning an array of 3 elements from FirewallMapInterface::getListeners() is deprecated, the 3rd element must be an instance of LogoutListener or null.
Passing custom class names to the Symfony\Component\Security\Core\Authentication\AuthenticationTrustResolver to define custom anonymous and remember me token classes is deprecated. To use custom tokens, extend the existing Symfony\Component\Security\Core\Authentication\Token\AnonymousToken or Symfony\Component\Security\Core\Authentication\Token\RememberMeToken.

SecurityBundle

Passing a FirewallConfig instance as 3rd argument to the FirewallContext constructor is deprecated, pass a LogoutListener instance instead.
Using the security.authentication.trust_resolver.anonymous_class and security.authentication.trust_resolver.rememberme_class parameters to define the token classes is deprecated. To use custom tokens extend the existing AnonymousToken and RememberMeToken.

Serializer

Relying on the default value (false) of the "as_collection" option is deprecated since 4.2. You should set it to false explicitly instead as true will be the default value in 5.0.

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