diff --git a/tools/ant-sword/src/main/java/com/reajason/javaweb/antsword/Utils.java b/tools/ant-sword/src/main/java/com/reajason/javaweb/antsword/Utils.java
index 8f6b0eb6..02dbfde1 100644
--- a/tools/ant-sword/src/main/java/com/reajason/javaweb/antsword/Utils.java
+++ b/tools/ant-sword/src/main/java/com/reajason/javaweb/antsword/Utils.java
@@ -1,6 +1,10 @@
 package com.reajason.javaweb.antsword;
 
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.Random;
+import java.util.Set;
 
 /**
  * @author ReaJason
@@ -8,15 +12,30 @@ import java.util.Random;
  */
 public class Utils {
 
+    public static final Set<String> JAVA_KEYWORDS = new HashSet<>(Arrays.asList(new String[]{
+            "abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
+            "continue", "default", "do", "double", "else", "enum", "extends", "final", "finally", "float",
+            "for", "goto", "if", "implements", "import", "instanceof", "int", "interface", "long", "native",
+            "new", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super",
+            "switch", "synchronized", "this", "throw", "throws", "transient", "try", "void", "volatile", "while"
+    }));
+
     public static String getRandomAlpha(int length) {
+        String randomString = getRandomStringInternal(length);
+        while (JAVA_KEYWORDS.contains(randomString)) {
+            randomString = getRandomStringInternal(length);
+        }
+        return randomString;
+    }
+
+    private static String getRandomStringInternal(int length) {
         String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
-        Random random = new Random();
+        SecureRandom random = new SecureRandom();
         StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < length; ++i) {
+        for (int i = 0; i < length; i++) {
             int number = random.nextInt(52);
             sb.append(str.charAt(number));
         }
-
         return sb.toString();
     }
 
diff --git a/tools/behinder/src/main/java/com/reajason/javaweb/behinder/Utils.java b/tools/behinder/src/main/java/com/reajason/javaweb/behinder/Utils.java
index 696a20e4..b1e66577 100644
--- a/tools/behinder/src/main/java/com/reajason/javaweb/behinder/Utils.java
+++ b/tools/behinder/src/main/java/com/reajason/javaweb/behinder/Utils.java
@@ -1,6 +1,10 @@
 package com.reajason.javaweb.behinder;
 
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.Random;
+import java.util.Set;
 
 /**
  * @author ReaJason
@@ -8,15 +12,30 @@ import java.util.Random;
  */
 public class Utils {
 
+    public static final Set<String> JAVA_KEYWORDS = new HashSet<>(Arrays.asList(new String[]{
+            "abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
+            "continue", "default", "do", "double", "else", "enum", "extends", "final", "finally", "float",
+            "for", "goto", "if", "implements", "import", "instanceof", "int", "interface", "long", "native",
+            "new", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super",
+            "switch", "synchronized", "this", "throw", "throws", "transient", "try", "void", "volatile", "while"
+    }));
+
     public static String getRandomAlpha(int length) {
+        String randomString = getRandomStringInternal(length);
+        while (JAVA_KEYWORDS.contains(randomString)) {
+            randomString = getRandomStringInternal(length);
+        }
+        return randomString;
+    }
+
+    private static String getRandomStringInternal(int length) {
         String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
-        Random random = new Random();
+        SecureRandom random = new SecureRandom();
         StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < length; ++i) {
+        for (int i = 0; i < length; i++) {
             int number = random.nextInt(52);
             sb.append(str.charAt(number));
         }
-
         return sb.toString();
     }
 
diff --git a/tools/godzilla/src/main/java/com/reajason/javaweb/godzilla/Utils.java b/tools/godzilla/src/main/java/com/reajason/javaweb/godzilla/Utils.java
index 46356680..8afd0479 100644
--- a/tools/godzilla/src/main/java/com/reajason/javaweb/godzilla/Utils.java
+++ b/tools/godzilla/src/main/java/com/reajason/javaweb/godzilla/Utils.java
@@ -1,6 +1,10 @@
 package com.reajason.javaweb.godzilla;
 
+import java.security.SecureRandom;
+import java.util.Arrays;
+import java.util.HashSet;
 import java.util.Random;
+import java.util.Set;
 
 /**
  * @author ReaJason
@@ -8,15 +12,30 @@ import java.util.Random;
  */
 public class Utils {
 
+    public static final Set<String> JAVA_KEYWORDS = new HashSet<>(Arrays.asList(new String[]{
+            "abstract", "assert", "boolean", "break", "byte", "case", "catch", "char", "class", "const",
+            "continue", "default", "do", "double", "else", "enum", "extends", "final", "finally", "float",
+            "for", "goto", "if", "implements", "import", "instanceof", "int", "interface", "long", "native",
+            "new", "package", "private", "protected", "public", "return", "short", "static", "strictfp", "super",
+            "switch", "synchronized", "this", "throw", "throws", "transient", "try", "void", "volatile", "while"
+    }));
+
     public static String getRandomAlpha(int length) {
+        String randomString = getRandomStringInternal(length);
+        while (JAVA_KEYWORDS.contains(randomString)) {
+            randomString = getRandomStringInternal(length);
+        }
+        return randomString;
+    }
+
+    private static String getRandomStringInternal(int length) {
         String str = "abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ";
-        Random random = new Random();
+        SecureRandom random = new SecureRandom();
         StringBuilder sb = new StringBuilder();
-        for (int i = 0; i < length; ++i) {
+        for (int i = 0; i < length; i++) {
             int number = random.nextInt(52);
             sb.append(str.charAt(number));
         }
-
         return sb.toString();
     }