Top Java Web Services Interview Questions & Answers:
1. Do you know JAXM messaging models?
JAXM messaging models has two types of messaging model, synchronous and asynchronous.
Synchronous messaging model
In this type of model, client directly interacts with the source. The client sends a request and waits for the response.
Asynchronous messaging model
In this model, client sends message to the messaging provider and returns back. Messaging provider then performs the routing of message to the end source.
2. Explain UDDI, DISCO and WSDL?
UDDI, Universal description, discovery and integration
It is the directory that is used to publish and discover public web services.
DISCO, Discovery
Commonly known as Discovery. Discovery clubs together common services and exposes schema document of the web services.
WSDL, Web Service description language.
This is used to describe web services. The description includes
URL of web services
Method and properties supported by web services
Data type it supports.
Protocol detail it supports.
JARX is a standard API that are used to access XML registries (list of services available on the web) from the JAVA platform. Client application can use JARX API to query the registries. It acts as a pluggable layer that allows access to registries implemented on different standards such as UDDI.
4. Explain each web service technologies - SOAP, WSDL, UDDI, eBXML and JAX pack?
A Simple Object Access Protocol (SOAP) enables the heterogeneous operating system to communicate with one another by using Hypertext Transfer Protocol (HTTP) and its Extensible Markup Language (XML) as the mechanisms for information exchange.
Web Services Description Language (WSDL) is an XML-based language used to describe the services business offers, which can be accessed electronically.
Universal Description Discovery and Integration (UDDI) is a specification for maintaining standardized directories of information about Web services in a universally recognized format. It records their capabilities, location and requirements.
The ebXML Messaging Service specification (ebMS) extends the SOAP specification. It provides the security and reliability features.
It is supported by a variety of commercial and open source software implementations.
Due to the interoperability of its implementations, ebMS is a strong complement or even alternative to other web service specifications.
The Java APIs for XML (JAX) Pack integrates all of Sun's programming interfaces for web services development and makes them available as a single download.
A java API for xml pack that integrates all of the programming interfaces by SUN for different web services development. All these interfaces are made as a single download. JAX PACK is a bundle of JAXB,JAXM,JAX-RPC,and JAXR. Jax pack includes the documentations for support for the SAX,DOM.SOAP,WSDL,XSLT,EBXML,UDDI standards.
6. Explain Electronic Business using XML?
EBXML is one from XML family that is based on the standards of OASIS and UN/CEFACT. The mission of this standard is to provide an open xml-based infrastructure which could enable the global use of e-business in an interoperable, secure and consistent manner by all of the partners of trading. This is a unique architecture with unique concepts that are part theory and part implemented within the existing EBXML standards.
7. Explain UDDI Universal Discovery Description Integration?
To publish and discover the information about web services, UDDI is a specification. It is an XML based standard. This standard is used for describing, publishing, and finding services. These services are found in a distributed environment through the use of a server called registry server.
Web Service Definition Language is used to describe a web service based on XML. WSDL is used for describing Web Services and to locate the services. WSDL consists of the information on what the service is all about, its residing location and the way of invocation the service.
SOAP is an XML-based protocol that enables 2 components to communicate each other. It has the rules to translate platform specific data into the XML format. Web services are based on SOAP protocol in order to expose their functionality to disparate application and platform.
10. What are smart web services?
A smart web service understands the situational context and capable of sharing the context with other services. The result of this web service is based on the needs like who, what, when, where it was called.
The customer's identity, role of a customer, security policies, physical location of a customer, type of client device are some of the number of the situational circumstances of that a smart web service is aware of.
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