Composer-Fehler beim Aktualisieren von Symfony 2.8 auf 3.0

Question

Ich habe meine Symfony-Version erfolgreich von 2.5 auf 2.8 aktualisiert und alle meine Anrufe auf veraltete Methoden gelöscht. So, jetzt möchte ich auf 3.0 aktualisieren. *. So aktualisiert ich meine composer.json mit "symfony/symfony": "3.0.*" und runned composer update symfony/symfony, aber ich bekomme die folgende Fehlermeldung in der Konsole:

λ composer update symfony/symfony 
Loading composer repositories with package information 
Updating dependencies (including require-dev) 
Your requirements could not be resolved to an installable set of packages. 

    Problem 1 
    - Conclusion: don't install symfony/symfony v3.0.9 
    - Conclusion: don't install symfony/symfony v3.0.8 
    - Conclusion: don't install symfony/symfony v3.0.7 
    - Conclusion: don't install symfony/symfony v3.0.6 
    - Conclusion: don't install symfony/symfony v3.0.5 
    - Conclusion: don't install symfony/symfony v3.0.4 
    - Conclusion: don't install symfony/symfony v3.0.3 
    - Conclusion: don't install symfony/symfony v3.0.2 
    - Conclusion: don't install symfony/symfony v3.0.1 
    - sensio/generator-bundle v2.5.3 requires symfony/framework-bundle ~2.2 -> satisfiable by symfony/symfony[v2.8.8], symfony/framework-bundle[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, v2.4.1, 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, v2.5.1, 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, v2.6.1, 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, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.2, v2.7.3, v2.7.4, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.1, v2.8.2, v2.8.3, v2.8.4, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9]. 
    - sensio/generator-bundle v2.5.3 requires symfony/console ~2.5 -> satisfiable by symfony/symfony[v2.8.8], symfony/console[v2.5.0, 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, v2.6.1, 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, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.2, v2.7.3, v2.7.4, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.1, v2.8.2, v2.8.3, v2.8.4, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9]. 
    - sensio/generator-bundle v2.5.3 requires symfony/framework-bundle ~2.2 -> satisfiable by symfony/symfony[v2.8.8], symfony/framework-bundle[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, v2.4.1, 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, v2.5.1, 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, v2.6.1, 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, v2.7.1, v2.7.10, v2.7.11, v2.7.12, v2.7.13, v2.7.14, v2.7.15, v2.7.16, v2.7.2, v2.7.3, v2.7.4, v2.7.5, v2.7.6, v2.7.7, v2.7.8, v2.7.9, v2.8.0, v2.8.1, v2.8.2, v2.8.3, v2.8.4, v2.8.5, v2.8.6, v2.8.7, v2.8.8, v2.8.9]. 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.10 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.11 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.2.9 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.10 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.11 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.12 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.13 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.14 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.15 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.16 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.17 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.18 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.19 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.20 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.21 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.22 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.23 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.24 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.25 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.26 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.27 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.28 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.29 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.30 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.31 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.32 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.33 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.34 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.35 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.36 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.37 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.38 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.39 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.40 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.41 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.42 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.3.9 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.10 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.4.9 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.10 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.11 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.12 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.5.9 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.10 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.11 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.12 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.13 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.6.9 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.10 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.11 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.12 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.13 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.14 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.15 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.16 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.7.9 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.0 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.1 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.2 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.3 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.4 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.5 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.6 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.7 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.8 
    - don't install symfony/symfony v3.0.0|don't install symfony/framework-bundle v2.8.9 
    - Can only install one of: symfony/symfony[v3.0.0, v2.8.8]. 
    - don't install symfony/console v2.5.0|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.1|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.10|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.11|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.12|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.2|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.3|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.4|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.5|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.6|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.7|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.8|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.5.9|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.0|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.1|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.10|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.11|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.12|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.13|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.2|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.3|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.4|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.5|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.6|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.7|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.8|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.6.9|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.0|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.1|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.10|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.11|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.12|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.13|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.14|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.15|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.16|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.2|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.3|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.4|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.5|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.6|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.7|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.8|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.7.9|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.0|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.1|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.2|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.3|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.4|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.5|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.6|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.7|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.8|don't install symfony/symfony v3.0.0 
    - don't install symfony/console v2.8.9|don't install symfony/symfony v3.0.0 
    - Installation request for symfony/symfony 3.0.* -> satisfiable by symfony/symfony[v3.0.0, 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]. 
    - Installation request for sensio/generator-bundle (locked at v2.5.3, required as ~2.3) -> satisfiable by sensio/generator-bundle[v2.5.3]. 

Hier ist meine composer.json:

{ 
    "name": "symfony/framework-standard-edition", 
    "license": "MIT", 
    "type": "project", 
    "description": "The \"Symfony Standard Edition\" distribution", 
    "autoload": { 
     "psr-0": { "": "src/", "SymfonyStandard": "app/" } 
    }, 
    "require": { 
     "php": ">=5.3.3", 
     "symfony/symfony": "3.0.*", 
     "doctrine/orm": "~2.2,>=2.2.3", 
     "doctrine/doctrine-bundle": "~1.2", 
     "twig/extensions": "~1.0", 
     "symfony/assetic-bundle": "~2.3", 
     "symfony/swiftmailer-bundle": "~2.3", 
     "symfony/monolog-bundle": "~2.4", 
     "sensio/distribution-bundle": "~3.0", 
     "sensio/framework-extra-bundle": "~3.0", 
     "incenteev/composer-parameter-handler": "~2.0", 
     "stof/doctrine-extensions-bundle": "dev-master", 
     "oh/instagram-bundle" : "dev-master", 
     "knplabs/knp-paginator-bundle": "~2.4", 
     "imagine/imagine": "0.6.*", 
     "excelwebzone/recaptcha-bundle": "2.6.*@dev" 
    }, 
    "require-dev": { 
     "sensio/generator-bundle": "~2.3" 
    }, 
    "scripts": { 
     "post-root-package-install": [ 
      "SymfonyStandard\\Composer::hookRootPackageInstall" 
     ], 
     "post-install-cmd": [ 
      "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::removeSymfonyStandardFiles" 
     ], 
     "post-update-cmd": [ 
      "Incenteev\\ParameterHandler\\ScriptHandler::buildParameters", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::buildBootstrap", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::clearCache", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installAssets", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::installRequirementsFile", 
      "Sensio\\Bundle\\DistributionBundle\\Composer\\ScriptHandler::removeSymfonyStandardFiles" 
     ] 
    }, 
    "config": { 
     "bin-dir": "bin" 
    }, 
    "extra": { 
     "symfony-app-dir": "app", 
     "symfony-web-dir": "web", 
     "symfony-var-dir": "var", 
     "symfony-bin-dir": "bin", 
     "incenteev-parameters": { 
      "file": "app/config/parameters.yml", 
      "keep-outdated": true 
     }, 
     "branch-alias": { 
      "dev-master": "2.5-dev" 
     } 
    } 
} 

Findet jemand, was mit meinem Setup nicht stimmt ?

Vielen Dank!

Answer 1

Wie im upgrade from Symfony 2.3 to 2.7 unvereinbar ist, Sie alle zu aktualisieren haben die Abhängigkeiten, nicht nur das symfony/symfony Paket.

Wir GitHub verwenden, um die diff between Symfony 2.8 and 3.0 zu erzeugen (wenn der Unterschied für die composer.json Datei nicht angezeigt wird, klicken Sie auf Dateien Registerkarte geändert, dann 26 geänderten Dateien und schließlich composer.json):

  "psr-4": { "": "src/" }, 
     "classmap": [ "app/AppKernel.php", "app/AppCache.php" ] 
    }, 
+ "autoload-dev": { 
+  "psr-4": { "Tests\\": "tests/" } 
+ }, 
    "require": { 
-  "php": ">=5.3.9", 
-  "symfony/symfony": "2.8.*", 
-  "doctrine/orm": "^2.4.8", 
-  "doctrine/doctrine-bundle": "~1.4", 
-  "symfony/swiftmailer-bundle": "~2.3", 
-  "symfony/monolog-bundle": "~2.4", 
-  "sensio/distribution-bundle": "~5.0", 
+  "php": ">=5.5.9", 
+  "symfony/symfony": "3.0.*", 
+  "doctrine/orm": "^2.5", 
+  "doctrine/doctrine-bundle": "^1.6", 
+  "doctrine/doctrine-cache-bundle": "^1.2", 
+  "symfony/swiftmailer-bundle": "^2.3", 
+  "symfony/monolog-bundle": "^2.8", 
+  "sensio/distribution-bundle": "^5.0", 
     "sensio/framework-extra-bundle": "^3.0.2", 
-  "incenteev/composer-parameter-handler": "~2.0" 
+  "incenteev/composer-parameter-handler": "^2.0" 
    }, 
    "require-dev": { 
-  "sensio/generator-bundle": "~3.0", 
-  "symfony/phpunit-bridge": "~2.7" 
+  "sensio/generator-bundle": "^3.0", 
+  "symfony/phpunit-bridge": "^3.0" 
    }, 
    "scripts": { 
     "post-install-cmd": [ 

So sollten Sie eine composer.json wie folgt verwenden:

"require": { 
     "php": ">=5.3.9", 
     "symfony/symfony": "3.0.*", 
     "doctrine/orm": "^2.5", 
     "doctrine/doctrine-bundle": "^1.6", 
     "doctrine/doctrine-cache-bundle": "^1.2", 
     "twig/extensions": "~1.0", 
     "symfony/swiftmailer-bundle": "^2.3", 
     "symfony/monolog-bundle": "^2.8", 
     "sensio/distribution-bundle": "^5.0", 
     "sensio/framework-extra-bundle": "^3.0.2", 
     "incenteev/composer-parameter-handler": "^2.0", 
     … 
    }, 
    "require-dev": { 
     "sensio/generator-bundle": "^3.0" 
    }, 

Und Konflikte zwischen Paketen sollten nicht mehr auftreten.

Answer 2

Sie haben diese Zeile ändern:

"require-dev": { 
    "sensio/generator-bundle": "~2.3" 
}, 

zu

"require-dev": { 
    "sensio/generator-bundle": "^3.0" 
}, 

Generator Bundle-Version 2.3 mit Symfony 3.0