Java Web Services Interview Preparation Guide

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Java Architecture for XML Binding: The java classes are mapped to XML representations. The two main features of JAXB are the ability to marshal Java objects into XML and unmarshal XML back to Java objects.

The Java API for XML Messaging (JAXM) enables distributed software applications to communicate using XML (and SOAP). JAXM supports both asynchronous and synchronous messaging.

Java API for xml processing. It provides the validation capability and parsing XML documents. There are three basic parsing interfaces in JAXP are DOM, SAX and Straming API for XML STAX.

Java API for XML based RPC. Allows a java based web service that is to be invoked by a Java application provided the description, still being consistent with WSDL description. This can resemble as Java RMI over web services.

Allowing a web service to be implemented at server side as a servlet/jsp or EJB container is the advantage of JAX-RPC.

Included in the bundle are
Java API for XML Processing (JAXP)
JAXP enables applications to parse, transform, validate and query XML documents. It uses an API that is independent of a particular XML processor implementation.
JAXP enables vendors to provide their own implementations without introducing dependencies in application code.

XML is a standard for exchanging data across heterogeneous systems.
Java provides a platform for building portable applications.
A combination of these two enables users and application developers to program Web based functionality on an platform.

JAXM is a SOAP 1.1 based standard to send XML documents over the Internet from the Java platform.
JAXM can be extended to work with higher level messaging protocols by adding the protocol's functionality on top of SOAP.

JAX-RPC project provides the code base for the Reference Implementation of JAX-RPC, the Java APIs for XML based RPC. JAX-RPC RI is a production-quality implementation that is used directly in a number of products by Sun and other vendors.

JAXR gives you a uniform way to use business registries that are based on open standards (ebXML) or industry consortium-led specifications (UDDI).

The operations between different software applications, which are running on a variety of platforms and frameworks are supported by a standard called Web services. The web services architecture provides the concepts, model and understanding web services and relationships among the components.

The WSA specifies the minimal characteristics that are very common for all web services and a number of characteristics to the needed web services. WSA is called interoperability architecture that means the global elements of a global web service network are identified by this architecture in order to perform the interoperability between the web services.

JAX-RPC uses SOAP to call remote procedures. JAX-RPC enables JAX-RPC clients to invoke web services developed across heterogeneous platform.