And a little more...

src/main/java/com/gmail/nossr50/config/treasure/TreasureConfig.java

@@ -442,13 +442,10 @@ public class TreasureConfig extends ConfigLoader {
     }
 
     private boolean noErrorsInTreasure(List<String> issues) {
-        if (issues.isEmpty()) {
-            return true;
-        }
-
         for (String issue : issues) {
             plugin.getLogger().warning(issue);
         }
-        return false;
+
+        return issues.isEmpty();
     }
 }

src/main/java/com/gmail/nossr50/datatypes/spout/huds/McMMOHud.java

@@ -56,11 +56,7 @@ public class McMMOHud {
     }
 
     public boolean isMenuOpened() {
-        if (menu != null) {
-            return true;
-        }
-
-        return false;
+        return (menu != null);
     }
 
     public void openMenu() {

src/main/java/com/gmail/nossr50/party/PartyManager.java

@@ -381,11 +381,7 @@ public final class PartyManager {
      * @return true if the player can invite
      */
     public static boolean canInvite(Player player, Party party) {
-        if (party.isLocked() && !party.getLeader().equalsIgnoreCase(player.getName())) {
-            return false;
-        }
-
-        return true;
+        return !(party.isLocked() && !party.getLeader().equalsIgnoreCase(player.getName()))
     }
 
     /**

src/main/java/com/gmail/nossr50/skills/repair/config/RepairConfig.java

@@ -88,21 +88,14 @@ public class RepairConfig extends ConfigLoader {
     }
 
     protected List<Repairable> getLoadedRepairables() {
-        if (repairables == null) {
-            return new ArrayList<Repairable>();
-        }
-
-        return repairables;
+        return repairables == null ? new ArrayList<Repairable>() : repairables;
     }
 
     private boolean noErrorsInRepairable(List<String> issues) {
-        if (issues.isEmpty()) {
-            return true;
-        }
-
         for (String issue : issues) {
             plugin.getLogger().warning(issue);
         }
-        return false;
+
+        return issues.isEmpty();
     }
 }

src/main/java/com/gmail/nossr50/skills/woodcutting/Woodcutting.java

@@ -230,14 +230,10 @@ public final class Woodcutting {
 
         short finalDurability = (short) (inHand.getDurability() + durabilityLoss);
         short maxDurability = ModUtils.isCustomTool(inHand) ? ModUtils.getToolFromItemStack(inHand).getDurability() : inHandMaterial.getMaxDurability();
+        boolean overMax = (finalDurability >= maxDurability);
 
-        if (finalDurability >= maxDurability) {
-            inHand.setDurability(maxDurability);
-            return false;
-        }
-
-        inHand.setDurability(finalDurability);
-        return true;
+        inHand.setDurability(overMax ? maxDurability : finalDurability);
+        return overMax;
     }
 
     /**

src/main/java/com/gmail/nossr50/util/skills/CombatUtils.java

@@ -591,9 +591,7 @@ public final class CombatUtils {
             if (tamer instanceof Player) {
                 Player owner = (Player) tamer;
 
-                if (owner == attacker || PartyManager.inSameParty(attacker, owner)) {
-                    return true;
-                }
+                return (owner == attacker || PartyManager.inSameParty(attacker, owner));
             }
         }