fix classpath

README.txt

@@ -4,8 +4,9 @@
   
   It has 2 major examples:
   
-  1. Quickstart a minimal CRUD Todo-List web application.
-  3. Showcase demonstrate many other interesting technologies.
+  1. Quickstart -- a minimal CRUD Todo-List web application.
+  3. Showcase -- demonstrate many other interesting technologies.
  
 -------------------------------
-Offical Site: http://www.springside.org.cn
\ No newline at end of file
+Offical Site: http://www.springside.org.cn
+Document: https://github.com/springside/springside4/wiki
\ No newline at end of file

modules/core/src/main/java/org/springside/modules/security/utils/Digests.java

@@ -11,7 +11,7 @@ import java.security.GeneralSecurityException;
 import java.security.MessageDigest;
 import java.security.SecureRandom;
 
-import org.apache.commons.lang.Validate;
+import org.apache.commons.lang3.Validate;
 import org.springside.modules.utils.Exceptions;
 
 /**