Enable nullable annotations

framework/src/Volo.Abp.BackgroundJobs.RabbitMQ/Volo/Abp/BackgroundJobs/RabbitMQ/JobQueue.cs

@@ -180,7 +180,7 @@ public class JobQueue<TArgs> : IJobQueue<TArgs>
             exchange: "",
             routingKey: routingKey,
             basicProperties: basicProperties,
-            body: Serializer.Serialize(args)
+            body: Serializer.Serialize(args!)
         );
 
         return Task.CompletedTask;

framework/src/Volo.Abp.HangFire/Volo/Abp/Hangfire/AbpHangfireBackgroundJobServer.cs

@@ -4,9 +4,9 @@ namespace Volo.Abp.Hangfire;
 
 public class AbpHangfireBackgroundJobServer
 {
-    public BackgroundJobServer HangfireJobServer { get; }
+    public BackgroundJobServer? HangfireJobServer { get; }
 
-    public AbpHangfireBackgroundJobServer(BackgroundJobServer hangfireJobServer)
+    public AbpHangfireBackgroundJobServer(BackgroundJobServer? hangfireJobServer)
     {
         HangfireJobServer = hangfireJobServer;
     }

framework/src/Volo.Abp.HangFire/Volo/Abp/Hangfire/AbpHangfireOptions.cs

@@ -19,11 +19,11 @@ public class AbpHangfireOptions
     public JobStorage? Storage { get; set; }
 
     [NotNull]
-    public Func<IServiceProvider, BackgroundJobServer> BackgroundJobServerFactory {
+    public Func<IServiceProvider, BackgroundJobServer?> BackgroundJobServerFactory {
         get => _backgroundJobServerFactory;
         set => _backgroundJobServerFactory = Check.NotNull(value, nameof(value));
     }
-    private Func<IServiceProvider, BackgroundJobServer> _backgroundJobServerFactory;
+    private Func<IServiceProvider, BackgroundJobServer?> _backgroundJobServerFactory;
 
     public AbpHangfireOptions()
     {