упорядочил папки с кодом.

src/Repository/SubscriberWorkspace/SubscriberWorkspace.java

@@ -1,8 +0,0 @@
-package Repository.SubscriberWorkspace;
-import Common.Database.iDBObject;
-public class SubscriberWorkspace extends iDBObject {
-    public String email; //почта
-    public String URL;  //адрес:порт машины
-    public String login; // имя пользователя
-    public String path; //рабочая папка на машине
-}

src/Repository/SubscriberWorkspace/SubscriberWorkspaceDBTable.java

@@ -1,13 +0,0 @@
-package Repository.SubscriberWorkspace;
-import Common.Database.iDBTable;
-public class SubscriberWorkspaceDBTable extends iDBTable<SubscriberWorkspace> {
-    public SubscriberWorkspaceDBTable() {
-        super(SubscriberWorkspace.class);
-    }
-    public SubscriberWorkspace findWorkspace(String email, String machineURL, String login) {
-        return this.Data.values().stream().filter(subscriberWorkspace ->
-                subscriberWorkspace.email.equals(email) &&
-                subscriberWorkspace.URL.equals(machineURL) &&
-                subscriberWorkspace.login.equals(login)).findFirst().orElse(null);
-    }
-}