Why cxf

Can you please tell me what is Reference implementation and What is Metro framework? In other words, it covers all parts of appropriate specification that is, JSR That means, at least in theory, that Metro-built Web service can normally communicate with.

NET-built Web service client and vice versa. Sign up or log in Sign up using Google. Sign up using Facebook. Sign up using Email and Password. Post as a guest Name. Email Required, but never shown. The Overflow Blog. The second part is the concrete binding of those abstract definitions of operations to concrete network protocol, where the service is located, and message format for the service. Typically, the WSDL files would be created using the tool provided by the web service framework.

Please refer to the inline comments for an explanation of the elements in the below WSDL file:. REST Representational State Transfer is neither a technology nor a standard; it's an architectural style—a set of guidelines for exposing resources over the Web. The resource can be any piece of information such as a book, order, customer, employee, and so on.

The client queries or updates the resource through the URI and, therefore, influences a state change in its representation. All resources share a uniform interface for the transfer of state between client and resource. HTTP provides a uniform interface and set of methods to manipulate the resource. Service Registry provides a mechanism to look up web services. Traditionally, there was UDDI specification that defined the standards on registering and discovering a web service, but it lacked enterprise-wide adoption.

Enterprises started shipping their own version of Service Registry, providing enterprise capabilities like service versioning, service classifications, and life cycle management. There are many different definitions available for a web service. Its definition can be discovered by other software systems. These systems may then interact with the web service in a manner prescribed by its definition, using XML-based messages conveyed by Internet protocols.

Simply, put web service is a software component that provides a business function as a service over the web that can be accessed through a URL. Web services are next generation web applications, modules, or components that can be thought of as a service provided over the web. Traditionally, we had static HTML pages as web content, which evolved into more dynamic full featured web applications providing business functionality and rich GUI features to the end user.

A web service component is one step ahead of this web paradigm and provides only business service, usually in the form of raw XML data that can be digested by virtually all client systems. The GUI and business functionality are well separated. A web service can be thought of as a self contained, self describing, modular application that can be published, located, and invoked across the web.

The greatest benefit that web services provide is interoperability. Web services can be ported on any platform and can be written in different programming languages.

Similarly, the client accessing the web service can be an application written in a different language and running on a different platform than that of a service itself. A web service involves three types of roles—a service consumer , a service provider, and an optional service registry. The following diagram shows the interaction between the service provider, the service consumer, and the service registry:. The service providers furnish the services over the web and respond to web service requests.

The service consumer consumes the services offered by the service provider. In SOAP-based web services, the service provider publishes the contract WSDL file of the service over the web where a consumer can access it directly or by looking up a service registry.

The service consumer usually generates a web service client code from a WSDL file using the tools offered by the web service framework to interact with the web service.

In the next chapter you will look at how to create web service clients from a WSDL file. However, if your requirement consists of various contracts to be defined and negotiated between the provider and consumer such as using a WSDL Web Service Description Language file and adhering to various web services specifications WS Specifications such as web service security for enterprise adoption, then SOAP-based web services is the right option.

A SOAP binding can have either an encoded use or a literal use. Encoding as the term implies, the message would be encoded using some format, while literal specifies plain text messages without any encoding logic.

Document style, as the name suggests, deals with XML documents as payloads which adhere to well defined contracts, typically created using XML schema definitions. The XML schema format specifies the contract for business messages being exchanged between web service provider and consumer, which the consumers can call and adhere to. The XML schema defines the request and response message format between the service provider and the service consumer.

Document literal style is the preferred way of web service communication for achieving interoperability. In order to serialize method parameters into the SOAP message so it can be deserialized back by any web service implementation, the SOAP specification defines a standard set of encoding rules. You should probably avoid developing RPC style web services as it has a lot of interoperability issues.

There are lot of specifications designed for SOAP-based web services. These web service specifications are designed for interoperable protocols for Security, Reliable Messaging, Management, and Transactions in loosely coupled systems.

Apache CXF is an open source web service framework that provides an easy to use, standard-based programming model for developing web services. Exactly what does CXF stand for? The project was sponsored by IONA. Both Celtix and XFire, while in their initial versions, had many things in common and therefore the developers of both projects decided to bring out the best of both worlds and planned a better 2.

The communities of both these projects entered incubation at the Apache Software foundation to develop version 2. The CXF framework implements a portable invocation of remote functions in the Java programming language. For this implementation, it follows the basic steps listed above.

Although it implements these two standards, it is not limited to these. You can extend it to support your own protocol, as well. As a Java developer, you have quite a lot of choices, when it comes to web services. Among the more popular frameworks, the typical short list consists of:. Each of these has various strengths and weaknesses. This article covers only attributes specific to Apache CXF.

A detailed comparison is far beyond the scope of this article. Apache CXF uses the Spring framework internally. You can categorize the Spring framework as the Java developer's Swiss-army knife. It provides a feature-rich dependency injection container and comes along with an extended set of support libraries, greatly simplifying everyday implementations. CXF uses the Spring framework as one of its cornerstones to support implementation and extension by a customized instance of ApplicationContext for operation and configuration.

To embed a software component into an existing application, the component must be self-reliant. This means, all necessary libraries and dependencies are included with that component. Nonetheless, there may be version conflicts with CXF libraries and the ones in the host application.

With that, there is a clearly defined bean for you to integrate and configure. You need not refactor your existing code base, in order to use Apache CXF. Even though it does rely on third party libraries, for issues like data marshalling, it does not need any interaction with other components, like a servlet container. In addition, it supports various deployment models, with each being configurable using its API. If you want to deploy CXF standalone or the application it is coupled with does not provide a servlet context , its embedded web server Jetty can be used.

This is already part of the distribution. Over 26 JIRA issues were fixed for 3. These releases contain a fix for a security issue, please see the security advisories page for more information:.

Over 22 JIRA issues were fixed for 3. CXF JAX-WS support includes some extensions to the standard that make it significantly easier to use, compared to the reference implementation: It will automatically generate code for request and response bean classes, and does not require a WSDL for simple cases.

It also includes a "simple frontend" which allows creation of clients and endpoints without annotations.