diff --git a/.idea/inspectionProfiles/Project_Default.xml b/.idea/inspectionProfiles/Project_Default.xml
index 31f23dfe..2bdf8d01 100644
--- a/.idea/inspectionProfiles/Project_Default.xml
+++ b/.idea/inspectionProfiles/Project_Default.xml
@@ -1,6 +1,9 @@
 <component name="InspectionProjectProfileManager">
   <profile version="1.0">
     <option name="myName" value="Project Default" />
+    <inspection_tool class="AutoCloseableResource" enabled="true" level="WARNING" enabled_by_default="true">
+      <option name="METHOD_MATCHER_CONFIG" value="java.util.Formatter,format,java.io.Writer,append,com.google.common.base.Preconditions,checkNotNull,org.hibernate.Session,close,java.io.PrintWriter,printf,java.io.PrintStream,printf,org.mockito.Mockito,mock" />
+    </inspection_tool>
     <inspection_tool class="ControlFlowStatementWithoutBraces" enabled="true" level="WARNING" enabled_by_default="true" />
     <inspection_tool class="JavadocReference" enabled="true" level="ERROR" enabled_by_default="true">
       <option name="REPORT_INACCESSIBLE" value="false" />
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/Application.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/Application.java
index 0a937169..cf2e5590 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/Application.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/Application.java
@@ -1,38 +1,8 @@
 package com.github.frimtec.android.securesmsproxy.domain;
 
-import androidx.annotation.NonNull;
-
 import java.util.Objects;
 
-public final class Application {
-
-  private final long id;
-  private final String name;
-  private final String listener;
-  private final String secret;
-
-  public Application(long id, String name, String listener, String secret) {
-    this.id = id;
-    this.name = name;
-    this.listener = listener;
-    this.secret = secret;
-  }
-
-  public long getId() {
-    return id;
-  }
-
-  public String getName() {
-    return name;
-  }
-
-  public String getListener() {
-    return listener;
-  }
-
-  public String getSecret() {
-    return secret;
-  }
+public record Application(long id, String name, String listener, String secret) {
 
   @Override
   public boolean equals(Object o) {
@@ -50,15 +20,4 @@ public boolean equals(Object o) {
   public int hashCode() {
     return Objects.hash(id);
   }
-
-  @Override
-  @NonNull
-  public String toString() {
-    return "Application{" +
-        "id=" + id +
-        ", name='" + name + '\'' +
-        ", listener='" + listener + '\'' +
-        ", secret='" + secret + '\'' +
-        '}';
-  }
 }
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRule.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRule.java
index cf94018b..55dced45 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRule.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRule.java
@@ -1,27 +1,9 @@
 package com.github.frimtec.android.securesmsproxy.domain;
 
-import androidx.annotation.NonNull;
-
 import java.util.Objects;
 import java.util.Set;
 
-public final class ApplicationRule {
-
-  private final Application application;
-  private final Set<String> allowedPhoneNumbers;
-
-  public ApplicationRule(Application application, Set<String> allowedPhoneNumbers) {
-    this.application = application;
-    this.allowedPhoneNumbers = allowedPhoneNumbers;
-  }
-
-  public Application getApplication() {
-    return application;
-  }
-
-  public Set<String> getAllowedPhoneNumbers() {
-    return allowedPhoneNumbers;
-  }
+public record ApplicationRule(Application application, Set<String> allowedPhoneNumbers) {
 
   @Override
   public boolean equals(Object o) {
@@ -40,12 +22,4 @@ public int hashCode() {
     return Objects.hash(application);
   }
 
-  @Override
-  @NonNull
-  public String toString() {
-    return "ApplicationRule{" +
-        "application=" + application +
-        ", allowedPhoneNumbers=" + allowedPhoneNumbers +
-        '}';
-  }
 }
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDao.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDao.java
index cd10a4f7..5afe9e34 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDao.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDao.java
@@ -66,15 +66,15 @@ public String insertOrUpdate(
         .map(phoneNumberFormatter::toE164)
         .collect(Collectors.toSet());
     if (applicationRule != null) {
-      secret = applicationRule.getApplication().getSecret();
+      secret = applicationRule.application().secret();
       ContentValues applicationValues = new ContentValues();
       applicationValues.put(TABLE_APPLICATION_COLUMN_LISTENER, listener);
       db.update(TABLE_APPLICATION, applicationValues, TABLE_APPLICATION_COLUMN_ID + "=?",
-          new String[]{String.valueOf(applicationRule.getApplication().getId())});
+          new String[]{String.valueOf(applicationRule.application().id())});
       ContentValues ruleValues = new ContentValues();
-      ruleValues.put(TABLE_RULE_COLUMN_APPLICATION_ID, applicationRule.getApplication().getId());
+      ruleValues.put(TABLE_RULE_COLUMN_APPLICATION_ID, applicationRule.application().id());
       allowedPhoneNumbersE164Formatted.stream()
-          .filter(phoneNumber -> !applicationRule.getAllowedPhoneNumbers().contains(phoneNumber))
+          .filter(phoneNumber -> !applicationRule.allowedPhoneNumbers().contains(phoneNumber))
           .forEach(phoneNumber -> {
             ruleValues.put(TABLE_RULE_COLUMN_ALLOWED_PHONE_NUMBER, phoneNumber);
             db.insert(TABLE_RULE, null, ruleValues);
@@ -128,7 +128,7 @@ public Map<String, Set<Application>> byPhoneNumbers(Set<String> phoneNumbers) {
           Application application = Objects.requireNonNull(
               applications.getOrDefault(id, new Application(id, cursor.getString(1), cursor.getString(2), cursor.getString(3)))
           );
-          applications.put(application.getId(), application);
+          applications.put(application.id(), application);
           String phoneNumber = cursor.getString(4);
           Set<Application> set = Objects.requireNonNull(
               applicationsByPhoneNumber.getOrDefault(phoneNumber, new HashSet<>())
@@ -150,7 +150,7 @@ private List<ApplicationRule> toApplicationRules(Cursor cursor) {
         Application application = Objects.requireNonNull(
             applications.getOrDefault(id, new Application(id, cursor.getString(1), cursor.getString(2), cursor.getString(3)))
         );
-        applications.put(application.getId(), application);
+        applications.put(application.id(), application);
         Set<String> phoneNumbers = Objects.requireNonNull(
             applicationPhoneNumbers.getOrDefault(application, new HashSet<>())
         );
@@ -167,6 +167,6 @@ private List<ApplicationRule> toApplicationRules(Cursor cursor) {
 
   public void delete(Application application) {
     SQLiteDatabase db = this.dbFactory.getDatabase(WRITABLE);
-    db.delete(TABLE_APPLICATION, TABLE_APPLICATION_COLUMN_ID + "=?", new String[]{String.valueOf(application.getId())});
+    db.delete(TABLE_APPLICATION, TABLE_APPLICATION_COLUMN_ID + "=?", new String[]{String.valueOf(application.id())});
   }
 }
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsListener.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsListener.java
index b2efa349..258bff68 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsListener.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsListener.java
@@ -27,7 +27,7 @@ public class SmsListener extends BroadcastReceiver {
     Intent intent = new Intent(SecureSmsProxyFacade.ACTION_BROADCAST_SMS_RECEIVED);
     intent.putExtra(Intent.EXTRA_TEXT, serializedSmsList);
     intent.addFlags(Intent.FLAG_INCLUDE_STOPPED_PACKAGES);
-    intent.setComponent(new ComponentName(application.getName(), application.getListener()));
+    intent.setComponent(new ComponentName(application.name(), application.listener()));
     return intent;
   };
 
@@ -83,8 +83,8 @@ public static void broadcastReceivedSms(Context context, Application application
   }
 
   private static void broadcastReceivedSms(Context context, Application application, List<Sms> smsList, BiFunction<Application, String, Intent> smsBroadcastIntentFactory) {
-    Log.i(TAG, "broadcastReceivedSms,  count: " + smsList.size() + "; to application: " + application.getName());
-    AesOperations aes = new Aes2(application.getSecret());
+    Log.i(TAG, "broadcastReceivedSms,  count: " + smsList.size() + "; to application: " + application.name());
+    AesOperations aes = new Aes2(application.secret());
     String serializedEncryptedSmsList = aes.encrypt(Sms.toJsonArray(smsList));
     context.sendOrderedBroadcast(smsBroadcastIntentFactory.apply(application, serializedEncryptedSmsList), null);
   }
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsSender.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsSender.java
index 5e975b96..89d250b7 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsSender.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/service/SmsSender.java
@@ -69,19 +69,19 @@ public void onReceive(Context context, Intent intent) {
           Log.w(TAG, String.format("SMS sending blocked because of unregistered sender application: %s.", applicationName));
           return;
         }
-        AesOperations aes = new Aes2(applicationRule.getApplication().getSecret());
+        AesOperations aes = new Aes2(applicationRule.application().secret());
         try {
           Sms sms = Sms.fromJson(aes.decrypt(text));
           if (PHONE_NUMBER_LOOPBACK.equals(sms.getNumber())) {
-            SmsListener.broadcastReceivedSms(context, applicationRule.getApplication(), Collections.singletonList(sms));
+            SmsListener.broadcastReceivedSms(context, applicationRule.application(), Collections.singletonList(sms));
           } else {
             PhoneNumberFormatter phoneNumberFormatter = this.phoneNumberFormatterProvider.apply(context);
             String number = phoneNumberFormatter.toE164(sms.getNumber());
-            if (applicationRule.getAllowedPhoneNumbers().contains(number)) {
+            if (applicationRule.allowedPhoneNumbers().contains(number)) {
               send(context, sms.getSubscriptionId(), number, sms.getText());
             } else {
               Log.w(TAG, String.format("SMS sending blocked because of not allowed phone number %s of application %s.",
-                  number, applicationRule.getApplication().getName()));
+                  number, applicationRule.application().name()));
             }
           }
         } catch (Exception e) {
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/AboutActivity.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/AboutActivity.java
index fcd54f57..c7774d02 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/AboutActivity.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/AboutActivity.java
@@ -22,15 +22,6 @@ protected void onCreate(Bundle savedInstanceState) {
     setupDisclaimer();
   }
 
-  @Override
-  public boolean onOptionsItemSelected(MenuItem item) {
-    if (item.getItemId() == android.R.id.home) {
-      onBackPressed();
-      return true;
-    }
-    return super.onOptionsItemSelected(item);
-  }
-
   private void setupAppInfo() {
     TextView textView = findViewById(R.id.app_info);
     String version = BuildConfig.VERSION_NAME;
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/ApplicationRuleArrayAdapter.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/ApplicationRuleArrayAdapter.java
index 3e3fdad3..ed34ff65 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/ApplicationRuleArrayAdapter.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/ApplicationRuleArrayAdapter.java
@@ -45,18 +45,18 @@ public View getView(int position, @Nullable View convertView, @NonNull ViewGroup
     }
     ApplicationRule applicationRule = getItem(position);
     if (applicationRule != null) {
-      Application application = applicationRule.getApplication();
+      Application application = applicationRule.application();
       ImageView logo = convertView.findViewById(R.id.application_logo);
-      packageInfoAccessor.getIcon(application.getName()).ifPresent(logo::setImageDrawable);
+      packageInfoAccessor.getIcon(application.name()).ifPresent(logo::setImageDrawable);
       TextView label = convertView.findViewById(R.id.application_label);
 
-      CharSequence labelText = this.packageInfoAccessor.getLabel(application.getName());
-      if (!packageInfoAccessor.isInstalled(application.getName())) {
+      CharSequence labelText = this.packageInfoAccessor.getLabel(application.name());
+      if (!packageInfoAccessor.isInstalled(application.name())) {
         labelText = labelText + "\n(not installed)";
       }
       label.setText(labelText);
       TextView phoneNumbers = convertView.findViewById(R.id.application_allowed_phone_numbers);
-      phoneNumbers.setText(applicationRule.getAllowedPhoneNumbers()
+      phoneNumbers.setText(applicationRule.allowedPhoneNumbers()
           .stream()
           .map(phoneNumber -> PhoneNumberUtils.formatNumber(phoneNumber, Locale.getDefault().getCountry()))
           .collect(Collectors.joining("\n"))
diff --git a/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/MainActivity.java b/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/MainActivity.java
index b21ee9ec..8a0ed99d 100644
--- a/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/MainActivity.java
+++ b/app/src/main/java/com/github/frimtec/android/securesmsproxy/ui/MainActivity.java
@@ -101,14 +101,14 @@ public boolean onContextItemSelected(MenuItem item) {
   }
 
   private void deleteApplicationRule(ApplicationRule applicationRule) {
-    dao.delete(applicationRule.getApplication());
+    dao.delete(applicationRule.application());
   }
 
   private void refresh() {
     List<ApplicationRule> all = dao.all();
     listView.setAdapter(new ApplicationRuleArrayAdapter(this, all,
         (adapter, applicationRule) -> view -> AlertDialogHelper.areYouSure(adapter.getContext(), (dialog, which) -> {
-          dao.delete(applicationRule.getApplication());
+          dao.delete(applicationRule.application());
           adapter.remove(applicationRule);
           adapter.notifyDataSetChanged();
           Toast.makeText(adapter.getContext(), R.string.general_entry_deleted, Toast.LENGTH_SHORT).show();
diff --git a/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRuleTest.java b/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRuleTest.java
index d72d1699..b9481afb 100644
--- a/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRuleTest.java
+++ b/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationRuleTest.java
@@ -15,8 +15,8 @@ void testProperties() {
     Application application = new Application(12L, "name", "listener", "secret");
     Set<String> allowedPhoneNumbers = Collections.singleton("number");
     ApplicationRule applicationRule = new ApplicationRule(application, allowedPhoneNumbers);
-    assertThat(applicationRule.getApplication()).isEqualTo(application);
-    assertThat(applicationRule.getAllowedPhoneNumbers()).isEqualTo(allowedPhoneNumbers);
+    assertThat(applicationRule.application()).isEqualTo(application);
+    assertThat(applicationRule.allowedPhoneNumbers()).isEqualTo(allowedPhoneNumbers);
   }
 
   @Test
diff --git a/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationTest.java b/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationTest.java
index 748c96d4..7f7c4915 100644
--- a/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationTest.java
+++ b/app/src/test/java/com/github/frimtec/android/securesmsproxy/domain/ApplicationTest.java
@@ -10,10 +10,10 @@ class ApplicationTest {
   @Test
   void testProperties() {
     Application application = new Application(12L, "name", "listener", "secret");
-    assertThat(application.getId()).isEqualTo(12L);
-    assertThat(application.getName()).isEqualTo("name");
-    assertThat(application.getListener()).isEqualTo("listener");
-    assertThat(application.getSecret()).isEqualTo("secret");
+    assertThat(application.id()).isEqualTo(12L);
+    assertThat(application.name()).isEqualTo("name");
+    assertThat(application.listener()).isEqualTo("listener");
+    assertThat(application.secret()).isEqualTo("secret");
   }
 
   @Test
diff --git a/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDaoTest.java b/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDaoTest.java
index 3b4b5efc..20530cd1 100644
--- a/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDaoTest.java
+++ b/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/ApplicationRuleDaoTest.java
@@ -17,7 +17,6 @@
 import java.util.List;
 import java.util.Map;
 import java.util.Set;
-import java.util.stream.Collectors;
 
 import static com.github.frimtec.android.securesmsproxy.service.ApplicationRuleDao.ALL_COLUMNS;
 import static com.github.frimtec.android.securesmsproxy.service.ApplicationRuleDao.SECRET_LENGTH;
@@ -259,19 +258,19 @@ private Cursor createCursor(List<List<Object>> expectedApplicationRuleValues) {
       values[values.length - 1] = false;
       when(cursor.moveToNext()).thenReturn(expectedApplicationRuleValues.size() > 1, values);
 
-      List<Long> ids = expectedApplicationRuleValues.stream().map(row -> (Long) row.get(0)).collect(Collectors.toList());
+      List<Long> ids = expectedApplicationRuleValues.stream().map(row -> (Long) row.get(0)).toList();
       when(cursor.getLong(0)).thenReturn(ids.get(0), ids.subList(1, ids.size()).toArray(new Long[0]));
 
-      List<String> names = expectedApplicationRuleValues.stream().map(row -> (String) row.get(1)).collect(Collectors.toList());
+      List<String> names = expectedApplicationRuleValues.stream().map(row -> (String) row.get(1)).toList();
       when(cursor.getString(1)).thenReturn(names.get(0), names.subList(1, names.size()).toArray(new String[0]));
 
-      List<String> listeners = expectedApplicationRuleValues.stream().map(row -> (String) row.get(2)).collect(Collectors.toList());
+      List<String> listeners = expectedApplicationRuleValues.stream().map(row -> (String) row.get(2)).toList();
       when(cursor.getString(2)).thenReturn(listeners.get(0), listeners.subList(1, listeners.size()).toArray(new String[0]));
 
-      List<String> secrets = expectedApplicationRuleValues.stream().map(row -> (String) row.get(3)).collect(Collectors.toList());
+      List<String> secrets = expectedApplicationRuleValues.stream().map(row -> (String) row.get(3)).toList();
       when(cursor.getString(3)).thenReturn(secrets.get(0), secrets.subList(1, secrets.size()).toArray(new String[0]));
 
-      List<String> numbers = expectedApplicationRuleValues.stream().map(row -> (String) row.get(4)).collect(Collectors.toList());
+      List<String> numbers = expectedApplicationRuleValues.stream().map(row -> (String) row.get(4)).toList();
       when(cursor.getString(4)).thenReturn(numbers.get(0), numbers.subList(1, numbers.size()).toArray(new String[0]));
     }
     return cursor;
diff --git a/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/IsAllowedPhoneNumberContentProviderTest.java b/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/IsAllowedPhoneNumberContentProviderTest.java
index 1c2fd848..e81f46ce 100644
--- a/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/IsAllowedPhoneNumberContentProviderTest.java
+++ b/app/src/test/java/com/github/frimtec/android/securesmsproxy/service/IsAllowedPhoneNumberContentProviderTest.java
@@ -31,6 +31,7 @@ void onCreate() {
   @Test
   void queryNotMatchingUri() {
     IsAllowedPhoneNumberContentProvider provider = new IsAllowedPhoneNumberContentProvider(null, (uri) -> false);
+    //noinspection resource
     assertThrows(IllegalArgumentException.class, () -> provider.query(mock(Uri.class), new String[0], null, null, null));
   }
 
diff --git a/app/src/test/java/com/github/frimtec/android/securesmsproxy/state/DbHelperTest.java b/app/src/test/java/com/github/frimtec/android/securesmsproxy/state/DbHelperTest.java
index 992e3db1..21697cc5 100644
--- a/app/src/test/java/com/github/frimtec/android/securesmsproxy/state/DbHelperTest.java
+++ b/app/src/test/java/com/github/frimtec/android/securesmsproxy/state/DbHelperTest.java
@@ -18,20 +18,22 @@ class DbHelperTest {
 
   @Test
   void onCreate() {
-    DbHelper dbHelper = new DbHelper(mock(Context.class));
-    SQLiteDatabase db = mock(SQLiteDatabase.class);
-    dbHelper.onCreate(db);
-    verify(db).execSQL(Mockito.startsWith("CREATE TABLE " + TABLE_APPLICATION));
-    verify(db).execSQL(Mockito.startsWith("CREATE TABLE " + TABLE_RULE));
-    verify(db).execSQL(Mockito.startsWith("CREATE VIEW " + VIEW_APPLICATION_RULE));
-    verifyNoMoreInteractions(db);
+    try (DbHelper dbHelper = new DbHelper(mock(Context.class))) {
+      SQLiteDatabase db = mock(SQLiteDatabase.class);
+      dbHelper.onCreate(db);
+      verify(db).execSQL(Mockito.startsWith("CREATE TABLE " + TABLE_APPLICATION));
+      verify(db).execSQL(Mockito.startsWith("CREATE TABLE " + TABLE_RULE));
+      verify(db).execSQL(Mockito.startsWith("CREATE VIEW " + VIEW_APPLICATION_RULE));
+      verifyNoMoreInteractions(db);
+    }
   }
 
   @Test
   void onUpgradeV1ToV1() {
-    DbHelper dbHelper = new DbHelper(mock(Context.class));
-    SQLiteDatabase db = mock(SQLiteDatabase.class);
-    dbHelper.onUpgrade(db, 1, 1);
-    verifyNoInteractions(db);
+    try (DbHelper dbHelper = new DbHelper(mock(Context.class))) {
+      SQLiteDatabase db = mock(SQLiteDatabase.class);
+      dbHelper.onUpgrade(db, 1, 1);
+      verifyNoInteractions(db);
+    }
   }
 }
\ No newline at end of file