autoload psr-4 gets lost during install - composer-php

Question

this is the composer.json of my bundle (shortened)
{
"name": "acme/my-bundle",
"type": "library",
"version": "0.5.0",
"autoload": {
"psr-4": {
"Acme\\MyBundle\\": ""
}
}
}
and in my project:
"require": {
"acme/my-bundle": "dev-master"
},
then i run composer install resulting in a installed.json like
[
{
"name": "acme/my-bundle",
"version": "dev-master",
"version_normalized": "9999999-dev",
"type": "library",
"installation-source": "source"
//
// here must be this:
// "autoload": {
// "psr-4": {
// "Acme\\MyBundle\\": ""
// }
// },
// but these lines are missing!
//
}
]
and a autoload-psr4.php:
<?php
// autoload_psr4.php #generated by Composer
$vendorDir = dirname(dirname(__FILE__));
$baseDir = dirname($vendorDir);
return array(
/* here must be this:
* 'Acme\\MyBundle\\' => array($vendorDir . '/acme/my-bundle'),
* but this line is missing!
*/
);
the autoload is gone, and also other keys like require
what am i missing?
i also tried psr-0, but no success. autoload_namespaces.php is just an empty array.

Answer 1

I did not mention, that I wanted to fetch a package from a private repo! This will make the difference!
So I had to re-specify the autoload
"require": {
"acme/my-bundle": "dev-master"
},
"repositories": [
{
"type": "package",
"package": {
"version": "dev-master",
"name": "acme/my-bundle",
"source": {
"url": "ssh://git#example.com/acme/my-bundle",
"type": "git",
"reference": "test"
},
// THIS IS |
// ADDITIONAL V
"autoload": {
"psr-4": {
"Acme\\MyBundle\\": ""
}
}
}
}
]
see https://stackoverflow.com/a/24193122/816362
Thanks #zacharydanger