упорядочил папки с кодом.

src/Common/Passes/All/SynchronizeTests.java

@@ -0,0 +1,60 @@
+package Common.Passes.All;
+import Common.Current;
+import Common.UI.UI;
+import Common.Utils.Utils;
+import Repository.ServerCode;
+import Repository.ServerExchangeUnit_2021;
+import Common.Passes.Server.TestingSystemPass;
+import org.apache.commons.io.FileUtils;
+
+import java.io.File;
+public class SynchronizeTests extends TestingSystemPass<Object> {
+    File new_db_file;
+    @Override
+    protected boolean canStart(Object... args) throws Exception {
+        return Current.getAccount().CheckRegistered(Log);
+    }
+    @Override
+    public String getIconPath() {
+        return "/icons/ComponentsActual.png";
+    }
+    @Override
+    public String getButtonText() {
+        return "";
+    }
+    @Override
+    protected void showPreparation() throws Exception {
+        server.db.SaveLastSelections();
+        server.db.configurations.ClearUI();
+        server.db.groups.ClearUI();
+        server.db.sapforConfigurations.ClearUI();
+        server.db.serverSapfors.ClearUI();
+    }
+    @Override
+    protected void ServerAction() throws Exception {
+        Command(new ServerExchangeUnit_2021(ServerCode.ReceiveTestsDatabase));
+        response.Unpack(new_db_file = Utils.getTempFileName("tdb"));
+    }
+    @Override
+    protected void performDone() throws Exception {
+        super.performDone();
+        server.db.Disconnect();
+        Utils.forceDeleteWithCheck(server.db.getFile());
+        FileUtils.moveFile(new_db_file, server.db.getFile());
+        server.db.Connect();
+        server.db.prepareTablesStatements();
+        server.db.Synchronize();
+        //убрать пересоздание таблиц. ибо сносится связь с интерфейсом окна.
+    }
+    @Override
+    protected void showDone() throws Exception {
+        if (UI.HasMainWindow()) {
+            server.db.configurations.ShowUI();
+            server.db.groups.ShowUI();
+            server.db.sapforConfigurations.ShowUI();
+            server.db.serverSapfors.ShowUI();
+            server.db.RestoreLastSelections();
+            UI.getMainWindow().ShowCheckedTestsCount();
+        }
+    }
+}