fixed the error that it now get initilized when finished loading components

.idea/dataSources.xml

@@ -5,7 +5,7 @@
       <driver-ref>derby.embedded</driver-ref>
       <synchronize>true</synchronize>
       <jdbc-driver>org.apache.derby.jdbc.EmbeddedDriver</jdbc-driver>
-      <jdbc-url>jdbc:derby:DerbyDb</jdbc-url>
+      <jdbc-url>jdbc:derby:DerbyDb;create=true</jdbc-url>
       <jdbc-additional-properties>
         <property name="com.intellij.clouds.kubernetes.db.enabled" value="false" />
       </jdbc-additional-properties>

src/main/java/at/ionas999/health/controller/MedicalPracticeController.java

@@ -21,7 +21,10 @@ public class MedicalPracticeController implements ChangeObserver<WaitingRoom> {
 
     private WaitingRoom waitingRoom;
 
-    public MedicalPracticeController()
+
+
+    @FXML
+    public void initialize()
     {
         this.waitingRoom = new WaitingRoom();
         this.waitingRoom.addObserver(this);
@@ -29,11 +32,6 @@ public class MedicalPracticeController implements ChangeObserver<WaitingRoom> {
 
     @Override
     public void update(WaitingRoom subject) {
-        if(this.waitingRoomTextField == null)
-        {
-            return;
-        }
-
         waitingRoomTextField.setText(waitingRoom.getPatients().stream()
                 .reduce("", (s, p) -> s + p + "\n", String::concat));
         preparation.setText(waitingRoom.getPatientInPreparation() == null ? "" : waitingRoom.getPatientInPreparation().toString());

src/main/java/at/ionas999/health/repositories/WaitingRoom.java

@@ -41,8 +41,9 @@ public class WaitingRoom {
     {
         patientService = new PatientService();
 
-        this.patients.addAll(this.patientService.GetAllPatients());
+        ArrayList<Patient> allPatients =  this.patientService.GetAllPatients();
-
+        this.patients.addAll(allPatients);
+        notifyObservers();
     }
 
     public void addObserver(ChangeObserver<WaitingRoom> observer) {

src/main/java/at/ionas999/health/services/DatabaseUtilsBase.java

@@ -10,7 +10,7 @@ public abstract class DatabaseUtilsBase {
 
     protected Connection GetDbConnection() throws SQLException {
         Connection connection = DriverManager.getConnection(DatabaseUtilsBase.connectionString);
-
+        connection.setAutoCommit(true);
         if(!ExistAnyTables(connection))
         {
             CreateTables(connection);

src/main/java/at/ionas999/health/services/PatientService.java

@@ -17,13 +17,13 @@ public class PatientService extends DatabaseUtilsBase implements TableCreation {
                 "    name VARCHAR(255) NOT NULL PRIMARY KEY,\n" +
                 "    appointment TIMESTAMP,\n" +
                 "    isEmergency BOOLEAN\n" +
-                ");";
+                ")";
         connection.createStatement().executeQuery(createTableSmt);
     }
 
     public boolean AddPatient(Patient patient) {
         try (Connection connection = this.GetDbConnection()) {
-            String insertStmt = "INSERT INTO Patient (name, appointment, isEmergency) VALUES (?, ?, ?);";
+            String insertStmt = "INSERT INTO Patient (name, appointment, isEmergency) VALUES (?, ?, ?)";
 
             PreparedStatement prepStmt = connection.prepareStatement(insertStmt);
 
@@ -41,7 +41,7 @@ public class PatientService extends DatabaseUtilsBase implements TableCreation {
 
     public void DeletePatient(String name) {
         try (Connection connection = this.GetDbConnection()) {
-            String stmt = "DELETE FROM Patient WHERE name = ?;";
+            String stmt = "DELETE FROM Patient WHERE name = ?";
             PreparedStatement prepStmt = connection.prepareStatement(stmt);
             prepStmt.setString(1, name);
             int updates = prepStmt.executeUpdate();
@@ -57,8 +57,9 @@ public class PatientService extends DatabaseUtilsBase implements TableCreation {
     public ArrayList<Patient> GetAllPatients() {
         ArrayList<Patient> patients = new ArrayList<>();
         try (Connection connection = this.GetDbConnection()) {
-            String stmt = "select name, appointment, isemergency from PATIENT;";
+            String stmt = "SELECT * FROM Patient";
-            ResultSet rs = connection.createStatement().executeQuery(stmt);
+            PreparedStatement prepStmt = connection.prepareStatement(stmt);
+            ResultSet rs = prepStmt.executeQuery();
 
              while (rs.next()) {
                 Patient p = new Patient(rs.getString(1),
@@ -66,7 +67,7 @@ public class PatientService extends DatabaseUtilsBase implements TableCreation {
                         rs.getBoolean(3));
                 patients.add(p);
             }
-
+            prepStmt.close();
             rs.close();
 
         } catch (SQLException e) {