title: Symfony : Upgrading from 2.8 to 3
body: <p>I got errors when I tried to upgrade symfony from 2.8 to 3 :   </p>
  
  <ul>
  <li>Conclusion: don't install symfony/symfony 3.0.x-dev</li>
  <li>Conclusion: don't install symfony/symfony v3.0.9</li>
  <li>Conclusion: don't install symfony/symfony v3.0.8</li>
  <li>Conclusion: don't install symfony/symfony v3.0.7  </li>
  <li>webfactory/exceptions-bundle 4.3.0 requires symfony/twig-bundle ~2.2 -> satisfiable by symfony/symfony[v2.8.13, 2.2.x-dev, 2.3.x-dev,
  2.4.x-dev, 2.5.x-dev, 2.6.x-dev, 2.7.x-dev, 2.8.x-dev], symfony/twig-bundle[2.2.x-dev, 2.3.x-dev, 2.4.x-dev, 2.5.x-dev,
  2.6.x-dev, 2.7.x-dev, 2.8.x-dev, v2.2.0, v2.2.1, v2.2.10, v2.2.11, v2.2.2, v2.2.3, v2.2.4, v2.2.5, v2.2.6, v2.2.7, v2.2.8, v2.2.9,
  v2.3.0, v2.3.1, v2.3.10, v2.3.11, v2.3.12, v2.3.13, v2.3.14, v2.3.15,
  v2.3.16, v2.3.17, v2.3.18, v2.3.19, v2.3.2, v2.3.20, v2.3.21,
  v2.3.22, v2.3.23, v2.3.24, v2.3.25, v2.3.26, v2.3.27, v2.3.28,
  v2.3.29, v2.3.3, v2.3.30, v2.3.31, v2.3.32, v2.3.33, v2.3.34,
  v2.3.35, v2.3.36, v2.3.37, v2.3.38, v2.3.39, v2.3.4, v2.3.40,
  v2.3.41, v2.3.42, v2.3.5, v2.3.6, v2.3.7, v2.3.8, v2.3.9, v2.4.0,
  v2.4.0-BETA1, v2.4.0-BETA2, v2.4.0-RC1, v2.4.1, v2.4.10, v2.4.2,
  v2.4.3, v2.4.4, v2.4.5, v2.4.6, v2.4.7, v2.4.8, v2.4.9, v2.5.0,
  v2.5.0-BETA1, v2.5.0-BETA2, v2.5.0-RC1, v2.5.1, v2.5.10, v2.5.11,
  v2.5.12, v2.5.2, v2.5.3, v2.5.4, v2.5.5, v2.5.6, v2.5.7, v2.5.8,
  v2.5.9, v2.6.0, v2.6.0-BETA1, v2.6.0-BETA2, v2.6.1, v2.6.10, v2.6.11,
  v2.6.12, v2.6.13, v2.6.2, v2.6.3, v2.6.4, v2.6.5, v2.6.6, v2.6.7,
  v2.6.8, v2.6.9, v2.7.0, v2.7.0-BETA1, v2.7.0-BETA2, v2.7.1, v2.7.10,
  v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.17,
  v2.7.18, v2.7.19, v2.7.2, v2.7.20, v2.7.3, v2.7.4, v2.7.5, v2.7.6,
  v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.0-BETA1, v2.8.1, v2.8.10,
  v2.8.11, v2.8.12, v2.8.13, v2.8.2, v2.8.3, v2.8.4, v2.8.5, v2.8.6,
  v2.8.7, v2.8.8, v2.8.9].</li>
  <li>Installation request for symfony/symfony 3.0.* -> satisfiable by symfony/symfony[3.0.x-dev, v3.0.0, v3.0.0-BETA1, v3.0.1, v3.0.2,
  v3.0.3, v3.0.4, v3.0.5, v3.0.6, v3.0.7, v3.0.8, v3.0.9].</li>
  <li>Installation request for webfactory/exceptions-bundle ^4.3 -> satisfiable by webfactory/exceptions-bundle[4.3.0].</li>
  </ul>
  
  <p>This is my composer.json :</p>
  
  <pre><code> "minimum-stability": "dev",
          "require": {
          "php": "&gt;=5.4.26",
          "symfony/symfony": "3.0.*",
          "doctrine/orm": "~2.2,&gt;=2.2.3,&lt;2.5",
          "doctrine/dbal": "&lt;2.5",
          "doctrine/doctrine-bundle": "~1.2",
          "twig/extensions": "~1.2",
          "symfony/assetic-bundle": "~2.3",
          "symfony/swiftmailer-bundle": "~2.3",
          "symfony/monolog-bundle": "~2.4",
          "sensio/distribution-bundle": "~3.0,&gt;=3.0.12",
          "sensio/framework-extra-bundle": "~3.0,&gt;=3.0.2",
          "incenteev/composer-parameter-handler": "~2.0",
  
          "knplabs/knp-paginator-bundle": "dev-master",
          "friendsofsymfony/user-bundle": "^1.3",
          "adesigns/calendar-bundle" : "dev-master",
          "friendsofsymfony/jsrouting-bundle" : "1.5.4",
          "liip/imagine-bundle" : "dev-master",
          "jordillonch/crud-generator" : "dev-master",
          "stof/doctrine-extensions-bundle": "~1.1@dev",
          "kms/froala-editor-bundle": "dev-master",
          "webfactory/exceptions-bundle" : "^4.3",
          "lexik/translation-bundle": "^4.0",
          "jms/i18n-routing-bundle": "dev-master",
          "hwi/oauth-bundle": "dev-master",
          "liuggio/excelbundle": "^2.0",
          "a2lix/translation-form-bundle": "^2.1",
          "besimple/i18n-routing-bundle": "dev-master",
          "knplabs/doctrine-behaviors": "~1.1",
          "doctrine/doctrine-fixtures-bundle": "dev-master",
          "unifik/database-config-bundle": "dev-master",
          "beelab/recaptcha2-bundle": "~1.2",
          "dario_swain/ds-recaptcha-bundle": "dev-master",
          "avocode/form-extensions-bundle": "dev-master",
          "gos/web-socket-bundle": "~1.0",
          "knplabs/knp-snappy-bundle": "^1.4",
          "umpirsky/symfony-upgrade-fixer": "^0.1.5"
      }
  </code></pre>