I'm learning about RESTful web services and there is a lot of terminology jumbled up in my head. Can someone briefly provide a distinction between the following technologies.
RESTEasy
JAX-RS & JAX-WS
Jersey
Restlet
JAXB
If I want to develop a RESTful web service and have that web service be consumed by an Android app, which technologies from the above should I use? I do not want to use SOAP...
Can someone briefly provide a distinction between the following
technologies?
JAX-WS (JSR-224)
This is the Java standard for SOAP web services which are different from RESTful web services. There are multiple implementations of this standard.
JAX-RS (JSR-311)
This is the Java standard for RESTful web services. There are multiple implementations of this standard which include:
Jersey (http://jersey.java.net)
Restlet with JAX-RS Extension (http://wiki.restlet.org/docs_1.1/13-restlet/28-restlet/57-restlet.html)
RESTEasy (https://www.jboss.org/resteasy/)
JAXB (JSR-222)
This is the Java standard for converting objects to/from XML. All JAX-RS implementations leverage a JAXB implementation when the JAX-RS service returns Java objects that need to be converted to/from XML. Some even leverage it when converting to/from JSON. There are multiple implementations of this standard.
Project JAXB (http://jaxb.java.net)
EclipseLink JAXB (MOXy) (http://www.eclipse.org/eclipselink/moxy.php)
If I want to develop a RESTful web service and have that web service
be consumed by an Android app, which technologies from the above
should I use?
Any Java EE 6 compliant application server will all the components necessary to create a RESTful web service that can easily be consumed by an Android app. Below is a series of articles I wrote that should help:
Part 1 - The Database
Part 2 - JPA Entities
Part 3 - JAXB Bindings
Part 4 - The RESTFul Service
Part 5 - The Client
JAX-RS are mainly used for web services but you can use it as servlet as you like.
I have used Jersey with Freemarker to develop frontend website and it works perfectly.
I have seen some projects which use Jersey as backend web services and backbone.js to develop frontend website.
Related
I am fairly new in Java EE web service. Right now we have a project to create an API web service that connects to a database and do some retrieve and write functions.
I've heard about the following:
Axis
Struts
Spring
Can someone please enlighten me as to what framework is applicable for the said project? I've tried Google of course but I need opinion on people who have experience on the said framework.
BTW we are going to create a SOAP web service. Additional tips are also appreciated.
Note that Java has the JAX-WS API which is a technology for building web services and clients that communicate using XML. In JAX-WS, a web service operation invocation is represented by an XML-based protocol, such as SOAP.
From the frameworks you mentioned, Spring brings SpringWS which you can use to build a SOAP web service.
However i don't know about Struts 2 core api offering any SOAP capabilities.
But it can be extend with other plugins that handle SOAP.
Axis (use the latest, Axis 2) is a good choice for SOAP. It is a Web Services / SOAP / WSDL engine. It also has some support for the Spring Framework.
There is also Apache CXF. It is the most widely used Web Services Standard Now; Improvement over AXIS2, which is now gradually being replaced by Apache CXF
If you need help deciding between them, read this comparison (Apache CXF vs. Apache AXIS vs. Spring WS) for the pros and cons.
There's also this great answer about cxf and axis 2.
I know that RESTful service is more about creating an architecture. Considering this statement i've extended my plain java class with HTTPServlet and have used doGet&doPost method as my web methods and everything seems working fine. I have tested this service by sending requests and it is also responding with a status line. Now what i am getting confused at, is this really a RESTful web service. And if yes, then what is jsr311 api for ? Isn't it mandatory to use jsr311 api/jar for creating Rest web service ??
JAX-RS is is set of APIs and specifications for implementing RESTful services with Java.
There are several implementations of JAX-RS, Jersey is the Reference Implementation
The first JSR for JAX-RS was "JSR 311: JAX-RS: The JavaTM API for RESTful Web Services". One of the artifacts produced for it is an API implemented by Java Interfaces. This API allows to implemente RESTful services with Java.
The current version of JAX-RS is defined in the "JSR 339: JAX-RS 2.0: The Java API for RESTful Web Services".
Since REST is an architectural style and not a product or a library, you can implement a RESTful HTTP service using plain Servlets. The idea behind JAX-RS is, that using just Servlets is too much work and that it ist usefult to have a standard way to implement a RESTful service using Java. JAX-RS defines this standard.
If you use JAX-RS, then your system will have a dependency on the JAX-RS API library
<dependency>
<groupId>javax.ws.rs</groupId>
<artifactId>javax.ws.rs-api</artifactId>
<version>2.0.1</version>
</dependency>
and deppendencies on the libraries of the JAX-RS implementation you use.
No not at all.
Raw Servlets is a fine for implementing a REST architecture. The assorted frameworks and libraries simply make that task a bit easier.
I need to work on webservice project. So going through book to cover the basics of webservice project. But these are questions I am struggling with:-
1.Java API for XML Web Services(JAX-WS):- JAX-WS is nothing but just a java programming language API for creating web services which is now a part of core java starting from version 6 (though originally developed as part of Java Web Services Development Pack). Is it right?
2.All other webservices framework whether it is metro, jersey, glassfish uses the JAX-WS internally. Is it correct?
Q: 1.Java API for XML Web Services(JAX-WS):- JAX-WS is nothing but just a java programming language API for creating web services which is now a
part of core java starting from version 6 (though originally developed
as part of Java Web Services Development Pack). Is it right?
It is correct, JAX-WS is an application programming interfaces (API). That API, together with the JAX-WS reference implementation (JAX-WS RI, RI = reference implementation) is a part of JDK since version 6. To extend a little bit, JAX-WS 2.0 is included in JDK 6 from the beginning, JAX-WS 2.1 comes with JDK 6u4, and you will find JAX-WS 2.2 in JDK 7 (see this link).
Q: 2.All other webservices framework whether it is metro, jersey, glassfish uses the JAX-WS internally. Is it correct?
Strictly speaking, Metro doesn't "use" JAX-WS, but includes already mentioned JAX-WS reference implementation. Jersey included JAX-RS implementation, and Glassfish is not a Web-service framework, but an application server. Glassfish comes with the complete Metro distribution.
JAX-WS is a Web Services framework that provides tools and infrastructure to develop Web Services solutions for the end users and middleware developersJAX-WS stands for Java API for XML Web Services. JAX-WS is a technology for building web services and clients that communicate using XML. JAX-WS allows developers to write message-oriented as well as RPC-oriented web services.
In JAX-WS, a web service operation invocation is represented by an XML-based protocol such as SOAP. The SOAP specification defines the envelope structure, encoding rules, and conventions for representing web service invocations and responses. These calls and responses are transmitted as SOAP messages (XML files) over HTTP.
There is another type of web-service, which is called RESTful.RESTful web services are built to work best on the Web. Representational State Transfer (REST) is an architectural style that specifies constraints, such as the uniform interface, that if applied to a web service induce desirable properties, such as performance, scalability, and modifiability, that enable services to work best on the Web. In the REST architectural style, data and functionality are considered resources and are accessed using Uniform Resource Identifiers (URIs), typically links on the Web. The resources are acted upon by using a set of simple, well-defined operations. The REST architectural style constrains an architecture to a client/server architecture and is designed to use a stateless communication protocol, typically HTTP. In the REST architecture style, clients and servers exchange representations of resources by using a standardized interface and protocol.
Genrally JAX-RS is used for developing RESTful web services. JAX-RS is a Java programming language API designed to make it easy to develop applications that use the REST architecture. The JAX-RS API uses Java programming language annotations to simplify the development of RESTful web services. Developers decorate Java programming language class files with JAX-RS annotations to define resources and the actions that can be performed on those resources. JAX-RS annotations are runtime annotations; therefore, runtime reflection will generate the helper classes and artifacts for the resource. A Java EE application archive containing JAX-RS resource classes will have the resources configured, the helper classes and artifacts generated, and the resource exposed to clients by deploying the archive to a Java EE server.
Different frameworks uses either JAX-WS or JAX-RS. Jersey uses JAX-RS and Metro uses JAXWS.
I would like to build a server with web services using Java EE, but I don't know which is the best Java EE framework.
Important to me are interoperability, performance, security and changeability.
P.s.
My server will not be used for a website, but it will be used to distribute applications (for mobile).
JAX-WS, JAX-RS, JAXB
There are numerous java API for the web services. The varies depends on the data handling formats;
1. SOAP
2. RESTful web services, which is commonly used i.e. JAX-WS and JAX-RS
But mostly used web service is Restful...
I'm looking for java frameworks, patterns or technics which allow a client server architecture to communicate via xml.
Any suggestions?
The relevant Java EE standards supported by most vendors are:
Java API for XML Web Services (JAX-WS)
Java API for RESTFul Web Services (JAX-RS)
I have recently written a series of blog posts explaining how easy this is to do using JAX-RS:
http://bdoughan.blogspot.com/2010/08/creating-restful-web-service-part-15.html