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.NET Core 2.0 app on Linux with supervisor cannot run due to ArgumentNullException


.NET Core 2.0 app on Linux with supervisor cannot run due to ArgumentNullException

By : lamar washington
Date : November 21 2020, 03:00 PM
seems to work fine Found out that the fix for this was to set the supervisor configuration to the following:
code :
command=/usr/bin/dotnet MyApplication.dll 
directory=/var/www/myapplication.mydomain


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SQL query to get the list of supervisor hierarchy. employee --> supervisor --> supervisor

SQL query to get the list of supervisor hierarchy. employee --> supervisor --> supervisor


By : Abid Ali
Date : March 29 2020, 07:55 AM
This might help you , This is the solution to my question
code :
  with recursive p as (
WITH emp_dept as(
SELECT employee_id,manager_id 
FROM employee,department
WHERE employee.dept_id= department.dept_id
) 

select e1.employee_id, e1.manager_id
from   emp_dept e1
where  e1.employee_id = 202

union 

select e2.employee_id , e2.manager_id
from   p
join   emp_dept e2 ON e2.employee_id = p.manager_id

)
select manager_id
  from   p
Can't install supervisor in Amazon Linux as a service manager for ASP .Net Core project

Can't install supervisor in Amazon Linux as a service manager for ASP .Net Core project


By : user2025434
Date : March 29 2020, 07:55 AM
around this issue I want to run a ASP.Net Core application with supervisor package manager in Amazon Linux 2. Execute following command to install supervisor , epel-release is available in Amazon Linux Extra topic "epel"
code :
$sudo amazon-linux-extras install epel
$sudo yum install supervisor
Loaded plugins: extras_suggestions, langpacks, priorities, update-motd
150 packages excluded due to repository priority protections
Resolving Dependencies
--> Running transaction check
---> Package supervisor.noarch 0:3.1.4-1.el7 will be installed
--> Processing Dependency: python-meld3 >= 0.6.5 for package: supervisor-3.1.4-1.el7.noarch
--> Running transaction check
---> Package python-meld3.x86_64 0:0.6.10-1.el7 will be installed
--> Finished Dependency Resolution

Dependencies Resolved

=============================================================================================================================================================================================================================================
 Package                                                      Arch                                                   Version                                                      Repository                                            Size
=============================================================================================================================================================================================================================================
Installing:
 supervisor                                                   noarch                                                 3.1.4-1.el7                                                  epel                                                 446 k
Installing for dependencies:
 python-meld3                                                 x86_64                                                 0.6.10-1.el7                                                 epel                                                  73 k

Transaction Summary
=============================================================================================================================================================================================================================================
Install  1 Package (+1 Dependent package)

Total download size: 519 k
Installed size: 2.5 M
Is this ok [y/d/N]: y
Downloading packages:
warning: /var/cache/yum/x86_64/2/epel/packages/python-meld3-0.6.10-1.el7.x86_64.rpm: Header V3 RSA/SHA256 Signature, key ID 352c64e5: NOKEY
Public key for python-meld3-0.6.10-1.el7.x86_64.rpm is not installed
(1/2): python-meld3-0.6.10-1.el7.x86_64.rpm                                                                                                                                                                           |  73 kB  00:00:00
(2/2): supervisor-3.1.4-1.el7.noarch.rpm                                                                                                                                                                              | 446 kB  00:00:00
---------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------
Total                                                                                                                                                                                                        1.5 MB/s | 519 kB  00:00:00
Retrieving key from file:///etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
Importing GPG key 0x352C64E5:
 Userid     : "Fedora EPEL (7) <epel@fedoraproject.org>"
 Fingerprint: 91e9 7d7c 4a5e 96f1 7f3e 888f 6a2f aea2 352c 64e5
 Package    : epel-release-7-11.noarch (@amzn2extra-epel)
 From       : /etc/pki/rpm-gpg/RPM-GPG-KEY-EPEL-7
Is this ok [y/N]: y
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
  Installing : python-meld3-0.6.10-1.el7.x86_64                                                                                                                                                                                          1/2
  Installing : supervisor-3.1.4-1.el7.noarch                                                                                                                                                                                             2/2
  Verifying  : python-meld3-0.6.10-1.el7.x86_64                                                                                                                                                                                          1/2
  Verifying  : supervisor-3.1.4-1.el7.noarch                                                                                                                                                                                             2/2

Installed:
  supervisor.noarch 0:3.1.4-1.el7

Dependency Installed:
  python-meld3.x86_64 0:0.6.10-1.el7

Complete!
ArgumentNullException for ConnectionString When trying to remotely connect to .net core API

ArgumentNullException for ConnectionString When trying to remotely connect to .net core API


By : user2343954
Date : March 29 2020, 07:55 AM
To fix the issue you can do you didn't tell the application to use appsettings.json. change below configuration
code :
var configuration = new ConfigurationBuilder()
    .AddCommandLine(args)
    .Build();
var configuration = new ConfigurationBuilder()
    .SetBasePath(env.ContentRootPath)
    .AddJsonFile("appsettings.json", optional: false, reloadOnChange: true)
    .AddJsonFile($"appsettings.{env.EnvironmentName}.json", optional: true)
    .AddCommandLine(args)
    .Build();
ef core plus: ArgumentNullException: Value cannot be null. Parameter name: property

ef core plus: ArgumentNullException: Value cannot be null. Parameter name: property


By : Parithimal Saravanan
Date : March 29 2020, 07:55 AM
around this issue Our library can update value but cannot update value using navigation property at this moment
This doesn't work
code :
.UpdateAsync(c => new Critique() { User = deletedUser });
.UpdateAsync(c => new Critique() { UserID = deletedUserID });
Two connections ASP.NET Core, EF core, ArgumentNullException error

Two connections ASP.NET Core, EF core, ArgumentNullException error


By : user2641456
Date : March 29 2020, 07:55 AM
Does that help There is no Data:DefaultConnection element in your appsettings.json file. Instead, try using Configuration["ConnectionStrings:DefaultConnection"]. This counts for LocalConnection as well.
Even easier might be to use the GetConnectionString() extension method. For example:
code :
Configuration.GetConnectionString("DefaultConnection")
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