I still did not get the point regarding dependency resolution, so i simply “composed” the composer file by writing down my own requirements (“i want only the hottest, newest stuff!!”, then tracked down the error messages, removing them by explicetly writing down the missing dependencies by using the latest “dev-*” versions. After that i tried to run the project, which actually did not work, but selective downgrade of some of the bundles (framework, security-extra blahblah) finally did the job.

Feel free to use it in your own projects:

{
	"require" : {
              "symfony/symfony" : "v2.0.12",
              "doctrine/common" : "2.1.4",
              "doctrine/orm" : "2.1.6",
              "symfony/finder" : "v2.0.12",

              "symfony/assetic-bundle" : "2.0-dev",
              "twig/extensions" : "dev-master",
              "jms/security-extra-bundle" : "1.1.0",
              "sensio/framework-extra-bundle" : "2.0-dev",
              "sensio/distribution-bundle" : "2.0-dev",
              "sensio/generator-bundle" : "2.0-dev"

 	},
        "autoload" : {
            "psr-0" : {
                "Acme" : "src/",
            }
        }
}

Create a file named “composer.json” in your project’s root directory, then paste the above code into it and save it.

Now run

$ curl -s http://getcomposer.org/installer | php

After that, download all dependencies by typing

$ php composer.phar install

The easiest way to create a full project including AcmeDemoBundle, AppKernel and the whole stuff is to download the symfony 2 standard distribution without vendors and calling the script from there. The only thing to do is to modify the path to autoload.php, which should point to vendor/.composer/autoload.php.

Now you are able to upgrade your project’s dependencies to the newest versions by simply modifying the composer.json file. Have fun!.