Custom application subscriptions returns NullPointerException

Question

Hi 
 
 I have custom application type with custom content. 
 I implemented ISubscribableContentType public bool CanSubscribe(Guid contentId, int userId) {
 return true;
 }

public bool CanDeleteSubscription(Guid contentId, int subscribedUserId, int userId) {
 return true;

}

public bool SupportsSubscriptions => true; But then I call Apis . Get < IApplicationSubscriptions >() . Create ( Guid . Parse ( "21BB7313-F73A-419B-B860-0CFC6E901885" ), Guid . Parse ( "00f28038-aa20-5c2b-9f80-cb16f194c6f4" ) ) 
 I recive NullPointerException in result's errors. Same with $core_v2_applicationSubscription.Create($applicationId, $applicationTypeId, "%{}")) App of course exists and correctly retrives from internal calls from my services. While debugging I found that issue comes from stored procedure te_Content_Content_Get - it checks application from te_Content_Contents and it absent. Can someone suggest what should I do with that?

Iurii Luzan · Accepted Answer

Found solution: 
 I have to call 
 Services.Get<IContentService>().EnsureExists(newApp); 
 after app created. Still don't know how it should works automatically, but that call helps to add required row into te_Content_Contents table. Also should have that field with "this" value 
 newApp.Application = this

Mathew D&#39;Amico · Answer

Does the entity for your custom application that implements IApplication and IContent return itself for the IContent.Applcation implementation. 
 Something like this: 
 public class Blog : IContent, IApplication
{

	IApplication IContent.Application
	{
 get { return this; }
	}

Custom application subscriptions returns NullPointerException

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