fix: solved TODO

src/main/java/com/application/munera/repositories/UserRepository.java

@@ -4,13 +4,11 @@ import com.application.munera.data.User;
 import org.springframework.data.jpa.repository.JpaRepository;
 import org.springframework.stereotype.Repository;
 
+import javax.annotation.Nonnull;
 import java.util.Optional;
 
 @Repository
 public interface UserRepository extends JpaRepository<User, Long> {
 
-    User findByUsername(final String username);
+    Optional<User> findByUsername(final @Nonnull String username);
-
-    //TODO: join these two methods
-    Optional<User> findOptionalByUsername(final String username);
 }

src/main/java/com/application/munera/security/SecurityConfiguration.java

@@ -42,10 +42,9 @@ public class SecurityConfiguration extends VaadinWebSecurity {
         return new InMemoryUserDetailsManager() {
             @Override
             public UserDetails loadUserByUsername(String username) throws UsernameNotFoundException {
-                 com.application.munera.data.User user = userRepository.findByUsername(username);
+                final var user = userRepository.findByUsername(username)
-                if (user == null) {
+                        .orElseThrow(() -> new UsernameNotFoundException("User not found"));
-                    throw new UsernameNotFoundException("User not found");
+
-                }
                 return User.withUsername(user.getUsername())
                         .password(user.getPassword())
                         .roles(user.getRoles().split(","))

src/main/java/com/application/munera/services/ExpenseService.java

@@ -1,16 +1,17 @@
 package com.application.munera.services;
 
-import com.application.munera.security.SecurityUtils;
 import com.application.munera.data.Expense;
 import com.application.munera.data.ExpenseType;
 import com.application.munera.data.Person;
 import com.application.munera.repositories.ExpenseRepository;
 import com.application.munera.repositories.PersonRepository;
 import com.application.munera.repositories.UserRepository;
+import com.application.munera.security.SecurityUtils;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.domain.Specification;
 import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 
 import javax.annotation.Nonnull;
@@ -225,7 +226,8 @@ public class ExpenseService {
             throw new IllegalStateException("No logged-in user found");
         }
         // Fetch the logged-in user
-        final var loggedInUserId = userRepository.findByUsername(userDetails.getUsername()).getId();
+        final var loggedInUserId = userRepository.findByUsername(userDetails.getUsername())
+                .orElseThrow(() -> new UsernameNotFoundException("User not found")).getId();
         Person loggedInPerson = this.personRepository.findByUserId(loggedInUserId).orElse(null);
 
         if (loggedInPerson == null) throw new IllegalStateException("No associated Person entity found for logged-in user");

src/main/java/com/application/munera/services/PersonService.java

@@ -6,6 +6,7 @@ import com.application.munera.repositories.PersonRepository;
 import org.springframework.data.domain.Page;
 import org.springframework.data.domain.Pageable;
 import org.springframework.data.jpa.domain.Specification;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.springframework.stereotype.Service;
 
 import java.math.BigDecimal;
@@ -88,7 +89,7 @@ public class PersonService {
      * @return Person entity of the logged-in user, or null if not found.
      */
     public Person getLoggedInPerson() {
-        final var user = userService.getLoggedInUser();
+        final var user = userService.getLoggedInUser().orElseThrow(() -> new UsernameNotFoundException("User not found"));
         return Objects.requireNonNull(personRepository.findByUserId(user.getId()).orElse(null));
     }
 

src/main/java/com/application/munera/services/UserService.java

@@ -7,6 +7,8 @@ import com.application.munera.repositories.UserRepository;
 import org.springframework.security.core.userdetails.UserDetails;
 import org.springframework.stereotype.Service;
 
+import java.util.Optional;
+
 import static com.application.munera.security.SecurityUtils.getLoggedInUserDetails;
 
 @Service
@@ -20,15 +22,16 @@ public class UserService {
         this.personRepository = personRepository;
     }
 
-    public User findByUsername (String username) {
+    public Optional<User> findByUsername (String username) {
         return this.userRepository.findByUsername(username);
     }
 
     /**
      * Fetches the logged-in User entity.
+     *
      * @return User entity of the logged-in user, or null if not found.
      */
-    public User getLoggedInUser() {
+    public Optional<User> getLoggedInUser() {
         UserDetails userDetails = getLoggedInUserDetails();
         if (userDetails != null) {
             String username = userDetails.getUsername();
@@ -58,7 +61,7 @@ public class UserService {
         //TODO: look if this method can substitute the one above: updateUser, they seem to do similar things
 
         // Check if the user already exists in the database
-        final var existingUserOptional = userRepository.findOptionalByUsername(user.getUsername());
+        final var existingUserOptional = userRepository.findByUsername(user.getUsername());
 
         User existingUser;
 

src/main/java/com/application/munera/views/expenses/ExpensesView.java

@@ -31,6 +31,7 @@ import jakarta.annotation.security.PermitAll;
 import org.springframework.beans.factory.annotation.Autowired;
 import org.springframework.orm.ObjectOptimisticLockingFailureException;
 import org.springframework.security.core.userdetails.UserDetails;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
 import org.vaadin.klaudeta.PaginatedGrid;
 
 import java.util.Objects;
@@ -319,8 +320,7 @@ public class ExpensesView extends Div implements BeforeEnterObserver {
         UserDetails userDetails = SecurityUtils.getLoggedInUserDetails();
         if (userDetails != null) {
             String username = userDetails.getUsername();
-            final var user = this.userService.findByUsername(username);
+            final var user = this.userService.findByUsername(username).orElseThrow(() -> new UsernameNotFoundException("User not found"));
-            if (user != null) {
                 Optional<Person> loggedInPerson = personService.findByUserId(user.getId());
                 if (loggedInPerson.isPresent()) {
                     Person person = loggedInPerson.get();
@@ -328,7 +328,6 @@ public class ExpensesView extends Div implements BeforeEnterObserver {
                     payer.setValue(person);
                     beneficiary.setValue(person);
                 }
-            }
         }
     }
 }

src/main/java/com/application/munera/views/settings/SettingsView.java

@@ -1,6 +1,5 @@
 package com.application.munera.views.settings;
 
-import com.application.munera.data.User;
 import com.application.munera.services.UserService;
 import com.application.munera.views.MainLayout;
 import com.vaadin.flow.component.button.Button;
@@ -17,6 +16,7 @@ import com.vaadin.flow.router.PageTitle;
 import com.vaadin.flow.router.Route;
 import jakarta.annotation.security.PermitAll;
 import org.springframework.beans.factory.annotation.Autowired;
+import org.springframework.security.core.userdetails.UsernameNotFoundException;
 
 @PageTitle("Settings")
 @PermitAll
@@ -54,9 +54,8 @@ public class SettingsView extends VerticalLayout implements BeforeEnterObserver
     }
 
     private void saveUserData() {
-        User loggedInUser = userService.getLoggedInUser();
+        final var loggedInUser = userService.getLoggedInUser().orElseThrow(() -> new UsernameNotFoundException("User not found"));
 
-        // Assuming you have methods to update user details
         loggedInUser.setFirstName(firstNameField.getValue());
         loggedInUser.setLastName(lastNameField.getValue());
 
@@ -76,7 +75,7 @@ public class SettingsView extends VerticalLayout implements BeforeEnterObserver
 
     @Override
     public void beforeEnter(BeforeEnterEvent event) {
-        final var loggedInUser = userService.getLoggedInUser();
+        final var loggedInUser = userService.getLoggedInUser().orElseThrow(() -> new UsernameNotFoundException("User not found"));
         firstNameField.setValue(loggedInUser.getFirstName());
         lastNameField.setValue(loggedInUser.getLastName());
         monthlyIncomeField.setValue(""); //TODO: implement monthly income