Added some missing defaults to switch cases.

src/main/java/com/gmail/nossr50/skills/gathering/Mining.java

@@ -397,6 +397,9 @@ public class Mining {
                 if (mcMMO.spoutEnabled) {
                     SpoutSounds.playSoundForPlayer(SoundEffect.POP, player, block.getLocation());
                 }
+
+            default:
+                break;
             }
         }
     }

src/main/java/com/gmail/nossr50/util/BlockChecks.java

@@ -92,6 +92,9 @@ public class BlockChecks {
         case WOODEN_DOOR:
         case WORKBENCH:
             return false;
+
+        default:
+            break;
         }
 
         if (block.getTypeId() == Config.getInstance().getRepairAnvilId()) {

src/main/java/com/gmail/nossr50/util/Combat.java

@@ -192,6 +192,9 @@ public class Combat {
             archeryCheck((Player) shooter, target, event);
 
             break;
+
+        default:
+            break;
         }
 
         if (targetIsPlayer) {