Useful links

Guidelines : Designing Web Services with the J2EE(TM) 1.4 Platform : JAX-RPC, SOAP, and XML Technologies

http://java.sun.com/blueprints/guidelines/designing_webservices/html/

If you are deploying Axis2 in a WAR/EAR under Websphere 6.1 with Web services feature pack or Websphere 7.0, please read the following tech notes:

• T​h​e​ ​A​p​a​c​h​e​ ​A​x​i​s​2​ ​s​e​r​v​l​e​t​ ​i​s​ ​n​o​t​ ​a​c​c​e​s​s​i​b​l​e​ ​a​f​t​e​r​ ​d​e​p​l​o​y​i​n​g​ ​t​h​e​ ​A​p​a​c​h​e​ ​A​x​i​s​2​ ​e​n​g​i​n​e
• D​e​p​l​o​y​i​n​g​ ​a​n​ ​a​p​p​l​i​c​a​t​i​o​n​ ​t​h​a​t​ ​c​o​n​t​a​i​n​s​ ​t​h​e​ ​A​p​a​c​h​e​ ​A​x​i​s​2​ ​r​u​n​t​i​m​e​ ​m​i​g​h​t​ ​c​r​e​a​t​e​ ​a​ ​c​l​a​s​s​ ​c​a​s​t​ ​e​x​c​e​p​t​i​o​n

http://davanum.wordpress.com/2009/03/12/technotes-about-axis2-and-websphere-co-existence/

Understanding Axis2 Deployment Architecture

http://www.developer.com/services/article.php/10928_3557741_1/Understanding-Axis2-Deployment-Architecture.htm

Embedding Apache Axis2 into Existing Applications

http://www.developer.com/open/article.php/10930_3777111_1/Embedding-Apache-Axis2-into-Existing-Applications.htm

Web services authentication

http://www.javaranch.com/journal/200709/web-services-authentication-axis2.html

HTTP Authentication using AXIS2 :

http://amilachinthaka.blogspot.com/2010/01/axis2-authentication.html

Method types defined by W3.org

http://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html

Character encoding gotchas - what I needed to do to handle orders from China

A nice article by blogger at : http://wwwilpower.blogspot.in/2011/03/character-encoding-gotchas-what-i.html 

Tutorials on Java

Covers Oauth, exception handling stategies.. etc in a simple language http://tutorials.jenkov.com/oauth2/authorization.html

Good Hints for developers : 

http://rdafbn.blogspot.gr/2012/08/these-are-just-some-tips-and-tricks-i.html