OAuth Simplified

OAuth 2.0 is an authorization protocol which applications can use for accessing each other data. A more common scenario which you all have seen is to login into a website using your Facebook or Google account. In this article we will understand OAuth 2.0 protocol which is release in Oct 2012. It is much simpler than its previous version 1.0, as 1.0 involve certificate which is removed from 2.0. OAuth protocol will have following participants
Resource OwnerResource ServerClient ApplicationAuthorization Server The resource owner can be a user or application which has data that can be share with other application. For example an user on Facebook or Google can be consider as Resource Owner and his profile/account data can be consider as resource. The Resource Server is the application which stores resource like Facebook and Google can be consider as Resource Server. The client application is the application which request for accessing resources. Lastly Authorization server is the server for …

Dive into WSDL

Everybody who is working with web service knows about WSDL document. WSDL stands for web service descriptive language and is used for describing a web service in language & implementation independent way. When I say language independent, means it is an xml document. WSDL document provides a detail description about a web service, about operation supported by web service, input and output parameter of an operation. With number of web service framework available, writing a web service is merely placing some annotations on business java class. Framework like CXF and others application server provides utility to generate a WSDL document using Java code and vice versa. With the use of utility we normally didn’t have to deal with different elements of WSDL document. But knowing about WSDL elements detail will help us to debug our application effectively.
I have created a sample web service project. You can access complete project from Git repository…

Profiling Java Application using annotation

This blog will provide details of measuring a performance of a code snippet while developing. This is will very handy to developer to quickly measure the performance of a method while unit testing.
Benefits: While developing a feature a developer usually missed out performance parameter which is equally and important nonfunctional requirement.  Ideally a developer must make it as a practice to test performance of their code along with unit testing and improved it if it is not fall under acceptance criteria. A quick measurement of performance is to check the elapse time of a method. Most of the time we monitor elapse time using System.currentTimeMillis method.  But for this we need to add unwanted statements in our code. Moreover along with elapse time sometime we also required some further information like mean, minimum, maximum, standard deviation and transactions per second over a set time span.
All above task for testing performance can be easily carried out by using perf4j API. It pr…