diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
index c281a2e96..9a62b31e8 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/GBApplication.java
@@ -399,7 +399,7 @@ public class GBApplication extends Application {
 
     private static void loadAppsNotifBlackList() {
         GB.log("Loading apps_notification_blacklist", GB.INFO, null);
-        apps_notification_blacklist = (HashSet<String>) sharedPrefs.getStringSet(GBPrefs.PACKAGE_BLACKLIST, null);
+        apps_notification_blacklist = (HashSet<String>) sharedPrefs.getStringSet(GBPrefs.PACKAGE_BLACKLIST, null); // lgtm [java/abstract-to-concrete-cast]
         if (apps_notification_blacklist == null) {
             apps_notification_blacklist = new HashSet<>();
         }
@@ -451,7 +451,7 @@ public class GBApplication extends Application {
 
     private static void loadAppsPebbleBlackList() {
         GB.log("Loading apps_pebblemsg_blacklist", GB.INFO, null);
-        apps_pebblemsg_blacklist = (HashSet<String>) sharedPrefs.getStringSet(GBPrefs.PACKAGE_PEBBLEMSG_BLACKLIST, null);
+        apps_pebblemsg_blacklist = (HashSet<String>) sharedPrefs.getStringSet(GBPrefs.PACKAGE_PEBBLEMSG_BLACKLIST, null); // lgtm [java/abstract-to-concrete-cast]
         if (apps_pebblemsg_blacklist == null) {
             apps_pebblemsg_blacklist = new HashSet<>();
         }
@@ -523,7 +523,7 @@ public static String packageNameToPebbleMsgSender(String packageName) {
 
     private static void loadCalendarsBlackList() {
         GB.log("Loading calendars_blacklist", GB.INFO, null);
-        calendars_blacklist = (HashSet<String>) sharedPrefs.getStringSet(GBPrefs.CALENDAR_BLACKLIST, null);
+        calendars_blacklist = (HashSet<String>) sharedPrefs.getStringSet(GBPrefs.CALENDAR_BLACKLIST, null); // lgtm [java/abstract-to-concrete-cast]
         if (calendars_blacklist == null) {
             calendars_blacklist = new HashSet<>();
         }
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/NotificationFilterActivity.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/NotificationFilterActivity.java
index bbe322f3a..8df741f62 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/NotificationFilterActivity.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/activities/NotificationFilterActivity.java
@@ -185,7 +185,7 @@ public class NotificationFilterActivity extends AbstractGBActivity {
 
             notificationFilterEntryDao.deleteByKeyInTx(mFilterEntryIds);
 
-            Long filterId = notificationFilterDao.insertOrReplace(mNotificationFilter);
+           long filterId = notificationFilterDao.insertOrReplace(mNotificationFilter);
 
             // only save words if filter mode != none
             if (mNotificationFilter.getNotificationFilterMode() != NOTIFICATION_FILTER_MODE_NONE) {
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java
index 25aa223d3..b63cb85cf 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/DeviceCommunicationService.java
@@ -356,7 +356,7 @@ public class DeviceCommunicationService extends Service implements SharedPrefere
     }
 
     /**
-     * @param text: original text
+     * @param text original text
      * @return 'text' or a new String without non supported chars like emoticons, etc.
      */
     private String sanitizeNotifText(String text) {
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/zetime/ZeTimeDeviceSupport.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/zetime/ZeTimeDeviceSupport.java
index 55c3d19ff..7b2d99cac 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/zetime/ZeTimeDeviceSupport.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/service/devices/zetime/ZeTimeDeviceSupport.java
@@ -1044,12 +1044,12 @@ public class ZeTimeDeviceSupport extends AbstractBTLEDeviceSupport {
                     if (musicControlMsg[6] > volume) {
                         musicCmd.event = GBDeviceEventMusicControl.Event.VOLUMEUP;
                         if(volume < 90) {
-                            volume += 10;
+                            volume += (byte) 10;
                         }
                     } else {
                         musicCmd.event = GBDeviceEventMusicControl.Event.VOLUMEDOWN;
                         if(volume > 10) {
-                            volume -= 10;
+                            volume -= (byte) 10;
                         }
                     }
                     try {
diff --git a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/EmojiConverter.java b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/EmojiConverter.java
index 40092b480..2968c71c3 100644
--- a/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/EmojiConverter.java
+++ b/app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/EmojiConverter.java
@@ -88,7 +88,7 @@ public class EmojiConverter {
         try {
             return EmojiUtils.shortCodify(text);
         } catch (Exception e){
-            LOG.warn("An exception occured when converting advanced emoji to ASCII", text);
+            LOG.warn("An exception occured when converting advanced emoji to ASCII: " + text);
             return text;
         }
     }