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I am using java message digest to create MD5 hash, which is used for authentication. The MD5 hash is stored in the database as varchar2. I did a test to create a user on my tomcat server on my local laptop. When I deployed the war to the test tomcat server on linux redhat, the authentication failed due to hash unmatched. I checked the user name and password: they are all correct. Both web server points to the same database. I suspect the hash generated on my local laptop is different from the one generated by the test server. Am I right? Below is the code with which I generated the hash. public static String getMD5Hash(String str) throws Exception { MessageDigest md = MessageDigest.getInstance("MD5"); md.update(str.getBytes()); return new String(md.digest()); } The String returned will be saved in the database table, which is defined below create table authen( passport varchar2(50), constraint pk_au primary key (passport) USING INDEX TABLESPACE xxxxxxx ); Here is the java version output on my laptop C:\Users\XXXX>java -version java version "1.6.0_25" Java(TM) SE Runtime Environment (build 1.6.0_25-b06) Java HotSpot(TM) Client VM (build 20.0-b11, mixed mode, sharing) Here is the java version output on the redhat server [xxxxxx@xxxxxxxxx ~]$ java -version java version "1.6.0_20" Java(TM) SE Runtime Environment (build 1.6.0_20-b02) Java HotSpot(TM) Client VM (build 16.3-b01, mixed mode, sharing)

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