add not nulls to configruation

service/configuration.yml

@@ -9,6 +9,8 @@ dbHost: 92f653f4-cf83-4801-8475-cd748954c3b6.node.dockerapp.io
 dbPort: 27017
 dbName: db
 
+digestMethod: "MD5"
+
 admins:
   - name: "gpietrus_admin"
     password: "41b450e73c974fca46911eba84e114f2" #gpietrus md5

service/src/main/java/com/telephoners/krakyournet/ctf/core/ApplicationConfiguration.java

@@ -6,17 +6,33 @@ import com.telephoners.krakyournet.ctf.beans.tasks.TextTask;
 import com.telephoners.krakyournet.ctf.beans.tasks.WebTask;
 import io.dropwizard.Configuration;
 
+import javax.validation.constraints.NotNull;
 import java.util.List;
 
 public class ApplicationConfiguration extends Configuration
 {
+    @NotNull
     private String dbHost;
+
+    @NotNull
     private int dbPort;
+
+    @NotNull
     private String dbName;
+
+    @NotNull
     private String digestMethod;
+
+    @NotNull
     private List<Team> teams;
+
+    @NotNull
     private List<TextTask> textTasks;
+
+    @NotNull
     private List<WebTask> webTasks;
+
+    @NotNull
     private List<User> admins;
 
     public List<User> getAdmins()