My custom module is not showing in system->configuration->advanced->advanced

[aishwaryacedcoss]

I have created a module in parallel to magento folder inside the app->code .I have created module.xml,config.xml in the etc folder.Is this is enough for creating the configuration for any module.Then why It is not showing..Please help me....????

[antonmakarenko]

In order for module to be registered in the Magento instance, you need to perform installation. When you install normally, it will automatically discover all modules and enable them by default (as long as your app/code/Your/Module/etc/module.xml file is correct).

But for an existing Magento instance, you'll need to register it as follows:

• Edit the app/etc/config.php file and find "modules" section. Add your module there and specify value "1" (enabled)
• Clean var/cache directory
• Run command: php -f setup/index.php update

[aishwaryacedcoss]

Thanx for this,
Now the Problem is this that I have created a simple controller inside app->Controller->Hello
inside that I have write

But then also after giving frontname in url it displays error:-Class Magentozend\Hello\Controller\Hello does not exist";i:1;s:1170:"#0 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/Code/Reader/ClassReader.php(37): ReflectionClass->__construct('Magentozend\Hello...')
Please solve this error.....asap

[aishwaryacedcoss]

Sometimes when I put frontname in the controller,It give errroe 404 not found...:(

[kandy]

Looks like classes from Magentozend namespace are not autoloading. To do this, please add a namespace to composer.json and rerun composer install.
Example config:

     "psr-4": {
            "Magentozend\\": "app/code/Magentozend"
        }

[aishwaryacedcoss]

Is there any other way to do this...accept composer.json.....and I have to run this command "composer install." from the root of my magento2 directory????

[aishwaryacedcoss]

After adding this in my composer.json under the root directory of magento2 parallel to app,
"autoload": {
"psr-4": {
"Magento\Framework": "lib/internal/Magento/Framework/",
"Alankent": "app/code/Alankent"

    }

},

It is giving same error,as above,Please solve this issue ..its urgent..???

[kandy]

Maybe you don't declare route for your module.
see routes.xml fro example

[aishwaryacedcoss]

I have declared in the etc->frontend->routes.xml

as bt then also...???

[otoolec]

In one comment it was suggested to add a PSR mapping for "magentozend" but in a response to that I only saw "Alankent" added. To handle all cases, please add the following to your root composer.json file, just after the "psr-4" section:

    "psr-0": {
       "": ["app/code/", "var/generation"]
    }

After adding this you'll need to run composer install again or composer dump-autoload from your root magento 2 directory.

[buskamuza]

One more clarification - when you change composer.json you should run composer update, not composer install.
@aishwaryacedcoss , please, try composer update.

[aishwaryacedcoss]

I am giving You my module ,Please tell where I am wrong ,I have created the Module by the namespace Alankent
having module.xml file,routes.xml inside etc->frontend,
and controller file inside Controller folder ,
put 1 for module in config.php,and do
"autoload": {
"psr-4": {
"Magento\Framework": "lib/internal/Magento/Framework/",
"Alankent": "app/code/Alankent"

    },
   "psr-0": {
   "": ["app/code/", "var/generation"]
}

in my composer.json of magento2 directory,and run composer update,in the terminal which results,
Loading composer repositories with package information
Updating dependencies (including require-dev)
Nothing to install or update
Writing lock file
Generating autoload files
But results in the error:-

Class AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController does not exist";i:1;s:1170:"#0 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/Code/Reader/ClassReader.php(38): ReflectionClass->__construct('AlanKent\ShowAp...')
#1 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/ObjectManager/Definition/Runtime.php(63): Magento\Framework\Code\Reader\ClassReader->getConstructor('AlanKent\ShowAp...')
#2 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/ObjectManager/Factory/Factory.php(186): Magento\Framework\ObjectManager\Definition\Runtime->getParameters('AlanKent\ShowAp...')
#3 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/ObjectManager/ObjectManager.php(87): Magento\Framework\ObjectManager\Factory\Factory->create('AlanKent\ShowAp...')
#4 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Http.php(132): Magento\Framework\ObjectManager\ObjectManager->get('Magento\Framewo...')
#5 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Bootstrap.php(265): Magento\Framework\App\Http->launch()
#6 /opt/lampp/htdocs/workspace/magento2/index.php(45): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#7 {main}";s:3:"url";s:32:"/workspace/magento2/showappstate";s:11:"script_name";s:29:"/workspace/magento2/index.php";}

[buskamuza]

@aishwaryacedcoss , you request class in namespace AlanKent, but in autoloader you defined it as Alankent. Please, fix letter case everywhere (in name of class, usage of class, files and directories names) to be consistent and let us know if it helped.

[aishwaryacedcoss]

Thanku for that..It my mistake...Bt Now also my controller is not echo any thing it looks like in the construct fuction ar any function ang gives error:-
What to do,????
Error log record number: 259577184682:-

a:4:{i:0;s:34:"Incorrect theme identification key";i:1;s:3298:"#0 /opt/lampp/htdocs/workspace/magento2/app/code/Magento/Core/Model/View/Design.php(162): Magento\Framework\View\Design\Theme\FlyweightFactory->create(NULL, 'showapplication...')
#1 /opt/lampp/htdocs/workspace/magento2/app/code/Magento/Core/Model/View/Design.php(226): Magento\Core\Model\View\Design->setDesignTheme(NULL)
#2 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Area.php(267): Magento\Core\Model\View\Design->setDefaultDesignTheme()
#3 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Area.php(225): Magento\Framework\App\Area->_initDesign()
#4 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Area.php(149): Magento\Framework\App\Area->_loadPart('design')
#5 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/View/DesignLoader.php(72): Magento\Framework\App\Area->load('design')
#6 /opt/lampp/htdocs/workspace/magento2/app/code/Magento/Core/App/Action/Plugin/Design.php(56): Magento\Framework\View\DesignLoader->load()
#7 [internal function]: Magento\Core\App\Action\Plugin\Design->aroundDispatch(Object(AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#8 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/Interception/Chain/Chain.php(81): call_user_func_array(Array, Array)
#9 /opt/lampp/htdocs/workspace/magento2/var/generation/AlanKent/ShowApplicationState/Controller/ShowApplicationStateFrontController/Interceptor.php(88): Magento\Framework\Interception\Chain\Chain->invokeNext('AlanKent\ShowAp...', 'dispatch', Object(AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController\Interceptor), Array, 'storeCheck')
#10 /opt/lampp/htdocs/workspace/magento2/app/code/Magento/Store/App/Action/Plugin/StoreCheck.php(62): AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController\Interceptor->AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController{closure}(Object(Magento\Framework\App\Request\Http))
#11 [internal function]: Magento\Store\App\Action\Plugin\StoreCheck->aroundDispatch(Object(AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController\Interceptor), Object(Closure), Object(Magento\Framework\App\Request\Http))
#12 /opt/lampp/htdocs/workspace/magento2/var/generation/AlanKent/ShowApplicationState/Controller/ShowApplicationStateFrontController/Interceptor.php(93): call_user_func_array(Array, Array)
#13 /opt/lampp/htdocs/workspace/magento2/var/generation/AlanKent/ShowApplicationState/Controller/ShowApplicationStateFrontController/Interceptor.php(115): AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController\Interceptor->___call('dispatch', Array, Array)
#14 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Http.php(133): AlanKent\ShowApplicationState\Controller\ShowApplicationStateFrontController\Interceptor->dispatch(Object(Magento\Framework\App\Request\Http))
#15 /opt/lampp/htdocs/workspace/magento2/lib/internal/Magento/Framework/App/Bootstrap.php(265): Magento\Framework\App\Http->launch()
#16 /opt/lampp/htdocs/workspace/magento2/index.php(45): Magento\Framework\App\Bootstrap->run(Object(Magento\Framework\App\Http))
#17 {main}";s:3:"url";s:68:"/workspace/magento2/showappstate/showapplicationstatefrontController";s:11:"script_name";s:29:"/workspace/magento2/index.php";}

[aishwaryacedcoss]

I dont why it is very difficult to create a module in magento2???