I need to learn Web Services in Java What are the different types in it

Question

Recently  I decided to start learning about java web services and when I started to search a tutorial for java web-services in google  I found out that there are many types of webservices XML based  SOAP based  also RESTful webservices    Also  I found that there is a JAX-WS specification for xml based web-services  and JAX-RS specification for creating RESTful webservices    Q1  I got confused  it would be great if anybody can help me understanding the difference between these different type of webservices  so that I can decide which one to learn first   Q2  Also  I want to learn in-depth about creating different types of web-services in java  Is there any tutorial or resources which can give an insight to each kind of webservice and a comparison between them     Q3  based on what scenarios and conditions should I decide that I want to create an XML based web-service rather than a SOAP service or I should go with RESTful service

User · Answer

Q1  Here are couple things to read or google more    Main differences between SOAP and RESTful web services in java http   www ajaxonomy com 2008 xml web-services-part-1-soap-vs-rest  It s up to you what do you want to learn first  I d recommend you take a look at the CXF framework  You can build both rest soap services   Q2  Here are couple of good tutorials for soap  I had them bookmarked     http   united-coders com phillip-steffensen developing-a-simple-soap-webservice-using-spring-301-and-apache-cxf-226  http   www benmccann com blog web-services-tutorial-with-apache-cxf   http   www mastertheboss com web-interfaces 337-apache-cxf-interceptors html  Best way to learn is not just reading tutorials  But you would first go trough tutorials to get a basic idea so you can see that you re able to produce something or not  and that would get you motivated   SO is great way to learn particular technology  or more   people ask lot of wierd questions  and there are ever weirder answers  But overall you ll learn about ways to solve issues on other way  Maybe you didn t know of that way  maybe you couldn t thought of it by yourself    Subscribe to couple of tags that are interesting to you and be persistent  ask good questions and try to give good answers and I guarantee you that you ll learn this as time passes  if you re persistent that is    Q3  You will have to answer this one yourself  First by deciding what you re going to build  after all you will need to think of some mini project or something and take it from there    If you decide to use CXF as your framework for building either REST SOAP services I d recommend you look up this book Apache CXF Web Service Development   It s fantastic  not hard to read and not too big either  win win

User · Answer

SOAP Web Services are standard-based and supported by almost every software platform  They rely heavily in XML and have support for transactions  security  asynchronous messages and many other issues  It   s a pretty big and complicated standard  but covers almost every messaging situation  On the other side  RESTful services relies of HTTP protocol and verbs  GET  POST  PUT  DELETE  to interchange messages in any format  preferable JSON and XML  It   s a pretty simple and elegant architectural approach  As in every topic in the Java World  there are several libraries to build consume Web Services  In the SOAP Side you have the JAX-WS standard and Apache Axis  and in REST you can use Restlets or Spring REST Facilities among other libraries    With question 3  this article states that RESTful Services are appropiate in this scenarios    If you have limited bandwidth If your operations are stateless  No information is preserved from one invocation to the next one  and each request is treated independently   If your clients require caching    While SOAP is the way to go when    If you require asynchronous processing  If you need formal contract Interfaces  In your service operations are stateful  For example  you store information data on a request and use that stored data on the next one

User · Answer

The SOAP WS supports both remote procedure call  i e  RPC  and message oriented middle-ware  MOM  integration styles  The Restful Web Service supports only RPC integration style   The SOAP WS is transport protocol neutral  Supports multiple protocols like HTTP S    Messaging  TCP  UDP SMTP  etc  The REST is transport protocol specific  Supports only HTTP or HTTPS protocols   The SOAP WS permits only XML data format You define operations  which tunnels through the POST  The focus is on accessing the named operations and exposing the application logic as a service  The REST permits multiple data formats like XML  JSON data  text  HTML  etc  Any browser can be used because the REST approach uses the standard GET  PUT  POST  and DELETE Web operations  The focus is on accessing the named resources and exposing the data as a service  REST has AJAX support  It can use the XMLHttpRequest object  Good for stateless CRUD  Create  Read  Update  and Delete  operations           GET - represent            POST - acceptRepresention            PUT - storeRepresention            DELETE - removeRepresention     SOAP based reads cannot be cached  REST based reads can be cached  Performs and scales better  SOAP WS supports both SSL security and WS-security  which adds some enterprise security features like maintaining security right up to the point where it is needed  maintaining identities through intermediaries and not just point to point SSL only  securing different parts of the message with different security algorithms  etc  The REST supports only point-to-point SSL security  The SSL encrypts the whole message  whether all of it is sensitive or not  The SOAP has comprehensive support for both ACID based  transaction management  for short-lived transactions and compensation based transaction management for long-running transactions  It also supports two-phase commit across distributed resources  The REST supports transactions  but it  is neither ACID compliant nor can provide two phase commit across distributed transactional resources as it is limited by its HTTP protocol   The SOAP has success or retry logic built in and provides end-to-end reliability even through SOAP intermediaries  REST does not have a standard messaging system  and expects clients invoking the service to deal with communication failures by retrying   source http   java-success blogspot in 2012 02 java-web-services-interview-questions html

User · Answer

If your application often uses http protocol then REST is best because of its light weight  and knowing that your application uses only http protocol choosing SOAP is not so good because it heavy Better to make decision on web service selection based on the protocols we use in our applications

[java] I need to learn Web Services in Java. What are the different types in it?

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