Magento 2 - best way to install extension

Question

I've made a new extension for my company, while developing everything seems to work properly. But when I've tried to install my extension I encountered some problems. At the beginning I've tried to install it by Web Setup Wizard, in version 2.1.2 I received some errors, log below:

[2017-01-11 13:40:11 CET] Job "maintenance_mode {"enable":true}" has been started 
[2017-01-11 13:40:11 CET] Magento maintenance mode is
enabled. 
[2017-01-11 13:40:11 CET] Job "maintenance_mode {"enable":true}" has successfully completed 

[2017-01-11 12:41:03 UTC] Job "setup:cache:disable []" has started Changed cache status: 
config: 1 -> 0 
layout: 1 -> 0 
block_html: 1 -> 0 
collections: 1 -> 0
reflection: 1 -> 0 
db_ddl: 1 -> 0 
eav: 1 -> 0 
customer_notification: 1 -> 0 
full_page: 1 -> 0 
config_integration: 1 -> 0 
config_integration_api: 1 -> 0 
translate: 1 -> 0 
config_webservice: 1 -> 0

[2017-01-11 12:41:03 UTC] Job "setup:cache:disable []" has been successfully completed 
[2017-01-11 12:41:03 UTC] Job "setup:module:disable {"components":[{"name":"Salesmanago_Integration"}]}" has started The following modules have been disabled:
- Salesmanago_Integration

Cache cleared successfully. Generated classes cleared successfully.
Please run the 'setup:di:compile' command to generate classes. Info:
Some modules might require static view files to be cleared. To do
this, run 'module:disable' with the --clear-static-content option to
clear them.

[2017-01-11 12:41:04 UTC] Cleaning generated files... 
[2017-01-11 12:41:05 UTC] Complete! [2017-01-11 12:41:05 UTC] Clearing cache...
[2017-01-11 12:41:05 UTC] Complete! [2017-01-11 12:41:05 UTC] Job "setup:module:disable {"components":[{"name":"Salesmanago_Integration"}]}" has been successfully completed
[2017-01-11 12:41:05 UTC] Job "setup:cache:enable ["config layout block_html collections reflection db_ddl eav customer_notification full_page config_integration config_integration_api translate config_webservice"]" has started 
Changed cache status: 
config: 0 -> 1 
layout: 0 -> 1 
block_html: 0 -> 1
collections: 0 -> 1 
reflection: 0 -> 1 
db_ddl: 0 -> 1 
eav: 0 -> 1
customer_notification: 0 -> 1 
full_page: 0 -> 1 
config_integration: 0 -> 1 
config_integration_api: 0 -> 1 
translate: 0 -> 1 
config_webservice: 0 -> 1

[2017-01-11 12:41:05 UTC] An error occurred while executing job
"setup:cache:enable ["config layout block_html collections reflection
db_ddl eav customer_notification full_page config_integration
config_integration_api translate config_webservice"]": Could not
complete setup:cache:enable ["config layout block_html collections
reflection db_ddl eav customer_notification full_page
config_integration config_integration_api translate
config_webservice"] successfully: Warning: ltrim() expects parameter 1
to be string, object given in
/var/www/html/magento-212opt/vendor/magento/framework/Code/Generator/EntityAbstract.php
on line 152 
[2017-01-11 13:42:03 CET] There was an error in previous
Update attempt.

I've read that it was connected with some errors in Magento 2, is this true ?

Later I was looking for alternative installation types.

First option: Copy extension to app/code and add line to etc/config.php

'Salesmanago_Integration' => 1,

And after page reload it was ok on my local machine.

Second Option: Paste extension to app/code and than run:

 php bin/magento setup:upgrade 

 php bin/magentosetup:static-content:deploy 

 chmod -R 777 var pub/static

This one also works on my local machine.

Not the questions, which option is the best? Why Web Wizard doesn't work ? There is a problem with plugin ?

Answer 1

Warning: ltrim() expects parameter 1
to be string, object given in
/var/www/html/magento-212opt/vendor/magento/framework/Code/Generator/EntityAbstract.php
on line 152

This suggests you are passing an object instead instead of the expecting class name.

/**
 * Get fully qualified class name
 *
 * @param string $className
 * @return string
 */
protected function _getFullyQualifiedClassName($className)
{
    $className = ltrim($className, '\\');
    return $className ? '\\' . $className : '';
}

This happen to me when I switched from developer mode to production mode.

I fixed it by deleting the content of var/di folder.