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Is JAX-RS compiled for JAVA 1.5 ..I am trying for a REST Client here..If so what would be the version which is compatible for the same?

I am currently working on migration work from SOAP to Rest consumption. I want to know
what is the best api for rest client (in my case there is no spring and Java version is 1.5)
Does JAX-RS or Apache CXF supports Java 1.5 if so what would be the version of those for dependency??

If you haven't worked so far with any REST-API, I would suggest to start with Jackson and JAX-RS. They are pretty much de facto standard.
JAX-RS was introduced in Java EE 6. (Java API for RESTful Web Services). Hence, JAX-RS is not part of Java 1.5. About Apache CXF, it is compatible with Java 1.5. CanCXFrunwithJDK1.5

Rest Web service in JAVA

What is the most common and standardized way to create a ReST Java Web service ?
For now, I just use a Perl program to invoke my Java application but I think it's not the most efficient way.

Use JAX-RS for creating RESTful webservices as it is officially part of java EE 6 specification, previously JAX-RPC was used which has now been replaced by JAX-RS, wikipedia states:
JAX-RS: Java API for RESTful Web Services (JAX-RS) is a Java programming language API that provides support in creating web services according to the Representational State Transfer (REST) architectural pattern.[1] JAX-RS uses annotations, introduced in Java SE 5, to simplify the development and deployment of web service clients and endpoints.
From version 1.1 on, JAX-RS is an official part of Java EE 6

Migrate contract-first SOAP-RPC service to Java

we currently have a problem with supporting a legacy API offered via SOAP-RPC. The current service is exposed via a PHP extension and now we would like to offer it via Java. Switching to a Java implementation would mean a SOAP-WS service since we could not find a way to expose SOAP-RPC in Java.
The facts:
Our Java application runs as a servlet in Tomcat
document style "rpc" is not supported in Apache CXF, leads to arrays described differently
Apache CXF only supports JAX-B and not JAX-RPC.
Is there any way / tutorial to explain the writing of a SOAP-RPC service with current technology like Spring-WS or Apache CXF?

using jax-ws in jboss

I am trying to call a web service from java. I am using JBoss as the client application server. The Web server is written in jax-ws and is running in some other server (which i dont know).
My requirement is to call the web service from my application running in JBoss. After doing enough search, I found that, jax-ws is a Standard and now included in jdk. Metro is a reference implementation of jax-ws and is provided in the Glassfish App server.
My Question is: -
Is there any other jax-ws implementation present in the market?
Just like each container provides its own implementation of Servlet API, do all of them provide implementation of Jax-ws?
Do I need to copy the Metro api to my Jboss application?
Where does JBossWS comes into play here?
A sample code provided by the Web Service host specifies that, the client needs to have to add a authentication token to the SOAPHeader, and in the sample code they have used com.sun.xml.ws package.
When I used MessageFactory to create a new SOAPMessage, will it use the Metro RI or JbossWS?
If Metro is glassfish's implementation of Jax-ws, then will it run in other app servers?
Added to that, my application exposes another Web service also (although it uses Axis 1).
I am getting a bit confused regarding this.
Can someone help me with some details regarding jax-ws, Metro, JbossWS. And where do each of them stand.

JBossWS is the Web-Service stack provided by the JBoss Application Server, and yes, it is also an implementation of the JAX-WS standard. As far as I know, JBossWS is based on Apache CXF.
Glassfish uses another implemetation of JAX-WS, Metro.
In order to communicate with a remote WebService (the implementation is not important, as long as it uses standards), you can simply use JAX-WS api and any Application Server which provides an implementation for it. JBoss does, so you have just to write your client following the JAX-WS api (and it should run on both JBoss and Glassfish or any other JAX-WS compliant container).
About the authentication, you should provide some more information, since there are a lot of options in the standards here.

First Java EE Project using REST

I've been going off of http://www.oracle.com/technetwork/articles/javase/index-137171.html and downloaded the files but I'm a little lost since I've never done this before.
I've installed Tomcat and Eclipse Java EE IDE but I don't know what kind of project to use to create a webservice and how to load and compile the code to the service.
Am I going about this the right way in using eclipse?

That article is old. Since then, the Java standards committee created a new API named JAX-RS (The REST counterpart to JAX-WS). Like JAX-WS, this is meant to standardize REST web service layers.
Its reference implementation is Jersey, which supports JAX-RS 0.8, 1.0, and 1.1.
I understand that Apache CXF has support for JAX-RS 0.8, but it is unclear about 1.0/1.1 support.
JBoss has RESTEasy. However, it is not immediately clear which versions of JAX-RS are supported by RESTEasy.
Another popular JAX-RS framework is Restlet. Unfortunately, I can't open their site from here to say which versions of JAX-RS they support.

Here is an REST (JAX-RS) example I put together. You will probably find part 4 the most helpful:
Part 1 - The Database
Part 2 - Mapping the Database to JPA Entities
Part 3 - Mapping JPA entities to XML (using JAXB)
Part 4 - The RESTful Service
Part 5 - The Client

If all you're creating is a lightweight RESTful service you can also look at GlassFish which provides a simple http server for REST.

You'll create a web project to deploy a web service of any kind. It'll be packaged in a WAR and deployed on Tomcat.