diff --git a/src/main/java/fr/xephi/authme/api/API.java b/src/main/java/fr/xephi/authme/api/API.java
index f63ac974..7fe3d43e 100644
--- a/src/main/java/fr/xephi/authme/api/API.java
+++ b/src/main/java/fr/xephi/authme/api/API.java
@@ -105,7 +105,7 @@ public class API {
         try {
             player.getInventory().setContents(content);
             player.getInventory().setArmorContents(armor);
-        } catch (NullPointerException npe) {
+        } catch (NullPointerException ignored) {
         }
     }
 
diff --git a/src/main/java/fr/xephi/authme/datasource/FlatFile.java b/src/main/java/fr/xephi/authme/datasource/FlatFile.java
index d6495b9d..2f0b3c47 100644
--- a/src/main/java/fr/xephi/authme/datasource/FlatFile.java
+++ b/src/main/java/fr/xephi/authme/datasource/FlatFile.java
@@ -73,7 +73,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -103,7 +103,7 @@ public class FlatFile implements DataSource {
             if (bw != null) {
                 try {
                     bw.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -165,7 +165,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -231,7 +231,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -276,7 +276,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -318,7 +318,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -364,13 +364,13 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
             if (bw != null) {
                 try {
                     bw.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -417,13 +417,13 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
             if (bw != null) {
                 try {
                     bw.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -468,13 +468,13 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
             if (bw != null) {
                 try {
                     bw.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -523,7 +523,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -582,7 +582,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -636,7 +636,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -673,7 +673,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -710,7 +710,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -737,16 +737,13 @@ public class FlatFile implements DataSource {
                     if (banned.contains(args[0])) {
                         lines.add(line);
                     }
-                } catch (NullPointerException | ArrayIndexOutOfBoundsException exc) {
+                } catch (NullPointerException | ArrayIndexOutOfBoundsException ignored) {
                 }
             }
             bw = new BufferedWriter(new FileWriter(source));
             for (String l : lines) {
                 bw.write(l + "\n");
             }
-        } catch (FileNotFoundException ex) {
-            ConsoleLogger.showError(ex.getMessage());
-            return;
         } catch (IOException ex) {
             ConsoleLogger.showError(ex.getMessage());
             return;
@@ -754,13 +751,13 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
             if (bw != null) {
                 try {
                     bw.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -841,7 +838,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
@@ -909,7 +906,7 @@ public class FlatFile implements DataSource {
             if (br != null) {
                 try {
                     br.close();
-                } catch (IOException ex) {
+                } catch (IOException ignored) {
                 }
             }
         }
diff --git a/src/main/java/fr/xephi/authme/process/quit/ProcessSyncronousPlayerQuit.java b/src/main/java/fr/xephi/authme/process/quit/ProcessSyncronousPlayerQuit.java
index fbbb88f8..5628c201 100644
--- a/src/main/java/fr/xephi/authme/process/quit/ProcessSyncronousPlayerQuit.java
+++ b/src/main/java/fr/xephi/authme/process/quit/ProcessSyncronousPlayerQuit.java
@@ -51,7 +51,7 @@ public class ProcessSyncronousPlayerQuit implements Runnable {
         }
         try {
             player.getVehicle().eject();
-        } catch (Exception e) {
+        } catch (Exception ignored) {
         }
     }
 }
diff --git a/src/main/java/fr/xephi/authme/security/crypts/BCRYPT.java b/src/main/java/fr/xephi/authme/security/crypts/BCRYPT.java
index 0311d9f5..72fec9f0 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/BCRYPT.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/BCRYPT.java
@@ -98,7 +98,7 @@ public class BCRYPT implements EncryptionMethod {
     private static String encode_base64(byte d[], int len)
         throws IllegalArgumentException {
         int off = 0;
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
         int c1, c2;
 
         if (len <= 0 || len > d.length)
@@ -154,7 +154,7 @@ public class BCRYPT implements EncryptionMethod {
      */
     private static byte[] decode_base64(String s, int maxolen)
         throws IllegalArgumentException {
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
         int off = 0, slen = s.length(), olen = 0;
         byte ret[];
         byte c1, c2, c3, c4, o;
@@ -230,7 +230,7 @@ public class BCRYPT implements EncryptionMethod {
         byte passwordb[], saltb[], hashed[];
         char minor = (char) 0;
         int rounds, off = 0;
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
 
         if (salt.charAt(0) != '$' || salt.charAt(1) != '2')
             throw new IllegalArgumentException("Invalid salt version");
@@ -283,7 +283,7 @@ public class BCRYPT implements EncryptionMethod {
      * @return an encoded salt value
      */
     public static String gensalt(int log_rounds, SecureRandom random) {
-        StringBuffer rs = new StringBuffer();
+        StringBuilder rs = new StringBuilder();
         byte rnd[] = new byte[BCRYPT_SALT_LEN];
 
         random.nextBytes(rnd);
diff --git a/src/main/java/fr/xephi/authme/security/crypts/PHPFUSION.java b/src/main/java/fr/xephi/authme/security/crypts/PHPFUSION.java
index 682bdc43..fc9440a6 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/PHPFUSION.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/PHPFUSION.java
@@ -50,9 +50,9 @@ public class PHPFUSION implements EncryptionMethod {
             Mac mac = Mac.getInstance(algo);
             mac.init(key);
             byte[] bytes = mac.doFinal(password.getBytes("ASCII"));
-            StringBuffer hash = new StringBuffer();
-            for (int i = 0; i < bytes.length; i++) {
-                String hex = Integer.toHexString(0xFF & bytes[i]);
+            StringBuilder hash = new StringBuilder();
+            for (byte aByte : bytes) {
+                String hex = Integer.toHexString(0xFF & aByte);
                 if (hex.length() == 1) {
                     hash.append('0');
                 }
diff --git a/src/main/java/fr/xephi/authme/security/crypts/XF.java b/src/main/java/fr/xephi/authme/security/crypts/XF.java
index bbfd5901..a1fc45ce 100644
--- a/src/main/java/fr/xephi/authme/security/crypts/XF.java
+++ b/src/main/java/fr/xephi/authme/security/crypts/XF.java
@@ -55,11 +55,11 @@ public class XF implements EncryptionMethod {
         MessageDigest md = MessageDigest.getInstance("SHA-256");
         md.update(password.getBytes());
         byte byteData[] = md.digest();
-        StringBuffer sb = new StringBuffer();
+        StringBuilder sb = new StringBuilder();
         for (byte element : byteData) {
             sb.append(Integer.toString((element & 0xff) + 0x100, 16).substring(1));
         }
-        StringBuffer hexString = new StringBuffer();
+        StringBuilder hexString = new StringBuilder();
         for (byte element : byteData) {
             String hex = Integer.toHexString(0xff & element);
             if (hex.length() == 1) {
diff --git a/src/main/java/fr/xephi/authme/security/pbkdf2/BinTools.java b/src/main/java/fr/xephi/authme/security/pbkdf2/BinTools.java
index 9db3150f..0631bd5a 100644
--- a/src/main/java/fr/xephi/authme/security/pbkdf2/BinTools.java
+++ b/src/main/java/fr/xephi/authme/security/pbkdf2/BinTools.java
@@ -46,13 +46,13 @@ public class BinTools {
         if (b == null) {
             return "";
         }
-        StringBuffer sb = new StringBuffer(2 * b.length);
-        for (int i = 0; i < b.length; i++) {
-            int v = (256 + b[i]) % 256;
-            sb.append(hex.charAt((v / 16) & 15));
-            sb.append(hex.charAt((v % 16) & 15));
+        StringBuffer stringBuffer = new StringBuffer(2 * b.length);
+        for (byte aB : b) {
+            int v = (256 + aB) % 256;
+            stringBuffer.append(hex.charAt((v / 16) & 15));
+            stringBuffer.append(hex.charAt((v % 16) & 15));
         }
-        return sb.toString();
+        return stringBuffer.toString();
     }
 
     /**
diff --git a/src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2Engine.java b/src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2Engine.java
index 67b65f05..1ca3f4ce 100644
--- a/src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2Engine.java
+++ b/src/main/java/fr/xephi/authme/security/pbkdf2/PBKDF2Engine.java
@@ -363,7 +363,7 @@ public class PBKDF2Engine implements PBKDF2 {
      * 3.</a>
      */
     protected void INT(byte[] dest, int offset, int i) {
-        dest[offset + 0] = (byte) (i / (256 * 256 * 256));
+        dest[offset] = (byte) (i / (256 * 256 * 256));
         dest[offset + 1] = (byte) (i / (256 * 256));
         dest[offset + 2] = (byte) (i / (256));
         dest[offset + 3] = (byte) (i);