composer php - symfony 2.7 base bundle class not found in AppKernel -

i've created symfony 2.7 bundle via generator command , got generated under src/bundle/bundlename, want use bundle via composer able use in project moved bundle files created composer.json bundle

{ "name" : "extremesolution/payment-handler-vodafone-bundle", "type" : "symfony-bundle", "description": "vodafone redpoints payment handler bundle", "authors": [     {         "name": "hazem taha",         "email": "hazem.taha@extremesolution.com"     } ], "require" : {     "php": "^5.5" },  "require-dev": {     "phpunit/phpunit": "~3.7" },  "autoload" : {     "psr-4" : {         "extremesolution\\bundle\\extremesolutionpaymenthandlervodafonebundle\\" : ""     }   } } 

and pushed bitbucket private repo , required bundle inside project composer.json , provided repository url , registered bundle inside appkernel.php

new extremesolution\bundle\paymenthandlervodafonebundle\extremesolutionpaymenthandlervodafonebundle()

however whenever run composer update

[runtimeexception]
error occurred when executing "'cache:clear --no-warmup'" command:
fatal error: class 'extremesolution\bundle\paymenthandlervodafonebundle\extremesolutionpaymenthandlervodafonebundle' not found in /home/kan/symfony_
trials/payment-example/app/appkernel.php on line 25
php fatal error: class 'extremesolution\bundle\paymenthandlervodafonebundle\extremesolutionpaymenthandlervodafonebundle' not found in /home/kan/sym
fony_trials/payment-example/app/appkernel.php on line 25
.

i'm using php version 5.5.38 via phpbrew, composer version 1.2.1, , symfony 2.7

am missing ? there custom configuration bundles used via composer ?

in composer.json file, configured psr-4 namespace prefix extremesolution\\bundle\\extremesolutionpaymenthandlervodafonebundle\\. however, according error message, trying load class extremesolution\bundle\paymenthandlervodafonebundle\extremesolutionpaymenthandlervodafonebundle (notice missing extremesolution part).