Why is JAX-WS described as one of the frontends for Apache CXF?
http://cxf.apache.org/docs/frontends.html
I only understand JAX-WS to be an Java api for creating web services.
In this case, frontend is not a GUI frontend rather the frontend that exposes JAVA APIs as a web service (hence, frontend). As described in the link you mentioned, there are different "frontend"(s) or rather modes of exposing and/or consuming the webservices you develop. JAX-WS is for SOAP, JAX-RS for REST and JavaScript services/client.
Related
I was reading a lot of information on the Internet, I promise, but I didn't find any post or tutorial in which appears How to write Java RESTful Based Axis2 Web Service
I don't know if this task has sense, because I have only read about RESTful Web Services or Web Services based on Axis2. It could be I have mixing differents ideas about how to develop Web Services and so, I need help. What can I do?
Where can I learn how to develop a RESTful Web Service based on Axis2?
You can't write a RESTful Web Service using Axis2. Axis2 is suited for SOAP web services.
For RESTful Web Services you have to use some other framework like Jersey
Edit: it seems you can indeed write a REST WS using Axis2 (yet Axis2 is mostly used for SOAP services).
Will I be able to connect to a JAX-RPC web service using a JAX-WS (wsimport) generated client stub? What are the effects of consuming a JAX-RPC web service using a JAX-WS client? Are there any advantages and disadvantages?
The tool wsimport works on a WSDL file which is an XML document describing the web service.
The tool wsimport does not care to the style of the service (RPC/DOCUMENT) as described in the WSDL.
If the WSDL has RPC-style, it will generate the client stubs for consuming RPC-style web services and similarly for document-style.
JAX-WS (which provides wsimport) provides (or rather capable of generating ) both the style (RPC/Document) of web services and both work equally well with respective types of service end points.
Here is an example of using wsimport for generating JAX-RPC client.
Hope this helps.
I am new to web services and below I am sharing my understanding so far by reading on net:
Apache Axis and Apache CXF - are web services frameworks used to develop Java web services.
JAX-RS - Java API to develop Restful web services.
JAX-WS - Java API to develop SOAP web services.
Is the above correct? Or if you want to add something to it.
In my project, I am going to use web services with Spring framework.I am told that project will have both SOAP and RESTful web services.I am very much new to this.
Can somebody please guide me in this regard by sharing some valuable information or any good link which will make me understand better?
Your statements are correct, but it's not clear whether you've understood one crucial fact: CXF and Axis are both implementations of the JAX-WS standard. CXF additionally implements JAX-RS, and there are some libraries that only implement JAX-RS, such as Jersey (Oracle's reference implementation) and RESTEasy from JBoss.
For your project, the big question is whether you will only consume those webservices, or also publish them. If you need to publish a webservice, you'll have to include the entire implementation library and learn to use it. If you only consume the services, you'll just need some generated client and data binding classes.
Another question is whether your RESTful services will talk XML or JSON (SOAP always uses XML), as you'll need a parser or binding framework for JSON (JAX-B for XML is included in recent JDKs).
I am in the process of writing a JSON based web service. The service will accept two types of requests: commands (e.g. createOrder) and queries (e.g. getOrders). Each request needs to send user credentials (username/password) for authentication (perhaps in HTTP headers). The service needs to be implemented in Java.
Which frameworks would you recommend for this use case? The very basic stack that I am thinking of is servlets backed by a JSON framework like Jackson. Are they any other frameworks that you would recommend and why? There is no need or desire to make the service RESTful, however smooth integration with Java EE 6 or Spring would be a plus.
Thanks in advance for your time.
Can I then interest you in RESTful Web Services (which is a JAX-RS API)? A library that implements JAX-RS is Jersey, Apache CXF, which is suited to allow JSON Web Service.
A related StackOverflow Post which shows REST clients that conforms to JAX-RS.
You should take a look at spring mvc and read this blog post which cover using spring mvc for restful WS.
Play! Framework would definitely fit your bill. It is not servlet-based but fulfills all of your requirements. Plus development with Play is very fast, you can get a prototype up and running in no time.
I personally use Apache CXF, with JAX-RS and jackson libraries. They are easy to implement and integration is dead easy. JAX-RS is a java standard, Jackson library is fast and handles circular references and Apache CXF needs only a couple of lines of configuration to setup and start running. Go for it!
An Open-Source Services Framework From Apache
-CXF has been designed to provide a pluggable architecture that supports not only XML but also non-XML type bindings, such as JSON and CORBA, in combination with any type of transport.
-Java EE integration: deploy services in Java EE application servers such as Apache Geronimo, JOnAS, Redhat JBoss, OC4J, Oracle WebLogic, and IBM WebSphere
-Standalone Java client/server
I am not much aware about the details as to which web servers support Web services written in Java.
Would Like to know the following three things:
1) What is required to have support for Web Services : Only Servlet Container or An Application Server + Web container?
2) Would like to know that do all Web Server supporting web development in Java support Web Services?
3) How to identify whether a particular server supports Web Services or not?
Thanking you in advance.
Your question is somewhat unclear. The term web service is applied to anything from a REST style API to SOAP based services to JSON based, etc etc. Wikipedia says an equivalent is a Web API, and an API can be pretty much anything.
So to answer your question. A servlet container is enough to support most common types of web services, it doesn't require an application server. Take a look at Apache CXF, which is a framework catering for a lot of web services styles (notably SOAP and REST).
Apache CXF is a rather large framework, and can take some time to get your head around. If you need something simpler, you may be better off looking at some object serialization frameworks and implement the servlets yourself (this is what I do mostly). To serialize to XML, use out-of-the box Java JAXB annotations. To serialize to JSON, use Jackson.
Assuming you're talking about SOAP WS-* web services via JAX-WS.
Java EE 5+ stipulates support for JAX-WS compatible web services within the container, both at the Web App level, and at the EJB level. So, any full boat, modern, App Server will have JAX-WS support built in.
Servlet 2.x and 3.0 do not have a requirement to support JAX-WS at the container level, but all of the major implementation of JAX-WS can be deployed within a WAR in a modern Servlet container (like Tomcat).
Java EE 6 offers a Web Profile, but the Web Profile does not include JAX-WS. Java EE 6 Full Profile includes both JAX-WS (SOAP, WS-* web services), and JAX-RS (for HTTP and more RESTful web services).
So.
If you bundle your own implementation, all of the containers should accommodate you. If you want it built it to the container, you'll need a full Java EE 5 or Java EE 6 App Server.