TYPO3 8.7.16: class from extension is not available - composer-php

Question

I try to load own extensions via composer.json but when I run the application I always get this error:
#1411840171: The class "Bm\AhContentelements\Rendering\VideoTagRenderer" you are trying to
register is not available
I load my ah contentelements extension in json as:
{
"repositories": [
{
"type": "composer",
"url": "https://composer.typo3.org/"
},
{
"type": "package",
"package": {
"name": "Bm/ah-content-api",
"version": "0.0.1",
"type": "typo3-cms-extension",
"source": {
"url": "https://user#bitbucket.org/u/ah_config_typo3.git",
"type": "git",
"reference": "master"
}
}
},
{
"type": "package",
"package": {
"name": "Bm/ah-contentelements",
"version": "0.0.1",
"type": "typo3-cms-extension",
"source": {
"url": "https://user#bitbucket.org/u/ah_contentelements_typo3.git",
"type": "git",
"reference": "master"
}
}
}
],
"name": "typo3/cms-base-distribution",
"description": "TYPO3 CMS Base Distribution",
"license": "GPL-2.0-or-later",
"require": {
"helhum/typo3-console": "^4.9.3 || ^5.2",
"typo3/cms-about": "^8.7.10",
"typo3/cms-belog": "^8.7.10",
"typo3/cms-beuser": "^8.7.10",
"typo3/cms-context-help": "^8.7.10",
"typo3/cms-documentation": "^8.7.10",
"typo3/cms-felogin": "^8.7.10",
"typo3/cms-fluid-styled-content": "^8.7.10",
"typo3/cms-form": "^8.7.10",
"typo3/cms-func": "^8.7.10",
"typo3/cms-impexp": "^8.7.10",
"typo3/cms-info": "^8.7.10",
"typo3/cms-info-pagetsconfig": "^8.7.10",
"typo3/cms-rte-ckeditor": "^8.7.10",
"typo3/cms-setup": "^8.7.10",
"typo3/cms-sys-note": "^8.7.10",
"typo3/cms-t3editor": "^8.7.10",
"typo3/cms-tstemplate": "^8.7.10",
"typo3/cms-viewpage": "^8.7.10",
"typo3/cms-wizard-crpages": "^8.7.10",
"typo3/cms-wizard-sortpages": "^8.7.10",
"typo3/cms": "^8.7",
"dmitryd/typo3-realurl": "2.*",
"GridElementsTeam/Gridelements": "8.2.*",
"clickstorm/cs_seo": "3.*",
"Bm/ah-content-api": "0.0.1",
"Bm/ah-contentelements": "0.0.1"
},
"scripts": {
"typo3-cms-scripts": [
"typo3cms install:fixfolderstructure",
"typo3cms install:generatepackagestates"
],
"post-autoload-dump": [
"#typo3-cms-scripts"
]
},
"extra": {
"typo3/cms": {
"web-dir": "public"
},
"helhum/typo3-console": {
"comment": "This option is not needed ay more for helhum/typo3-console 5.x",
"install-extension-dummy": false
}
},
"autoload": {
"psr-4": {
"Bm\\AhContentelements\\": "public/typo3conf/ext/ah-contentelements/Classes",
"Bm\\AhContentapi\\": "public/typo3conf/ext/ah-contentapi/Classes"
}
}
}
What do I wrong, I'm struggling with this for days now..

Answer 1

I never did it the way you did it. I always include a composer.json in each of my extensions. There the autoload part looks like this:
"autoload": {
"psr-4": {
"Bm\\AhContentelements\\": "Classes"
}
}
In the repositories section of my main composer.json I then have something like this:
{
"type": "path",
"url": "./packages/*"
},
I then require my extension with composer require Bm/ah-contentelements:"#dev". Composer then searches the packages directory for the specified extension.

Answer 2

I think the path is wrong: you have to use the root (the directory on the same level like your composer file and the vendor directory) like "web" or "html".
so instead of
"autoload": {
"psr-4": {
"Bm\\AhContentelements\\": "typo3conf/ext/ah-contentelements/Classes",
"Bm\\AhContentapi\\": "typo3conf/ext/ah-contentapi/Classes"
}
you should use something like
"autoload": {
"psr-4": {
"Bm\\AhContentelements\\": "web/typo3conf/ext/ah-contentelements/Classes",
"Bm\\AhContentapi\\": "web/typo3conf/ext/ah-contentapi/Classes"
}
After changing do not forget to composer dump-autoload