While preparing for your technical interview, it is critical to go over Java Web Services interview questions. Knowing what types of Java Web Services interview questions to expect and brushing up on fundamental Java concepts can help you ace the tech interview.
Java is a high-level, class-based, object-oriented programming language. Using Java Web Services, it can communicate and interact with PHP and.Net. Because Java can interface with various platforms, it can be utilized to create huge web applications. Java web development allows users to engage with the interface by creating dynamic web pages. As a result, Java Web Services interview questions play an important role in tech interviews for software engineers, software developers, and engineering managers.
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Listed below are Java Web Services interview questions and answers that you can refer to for a quick revision of vital concepts:
Generally, web services comprise applications that allow communication between devices over the internet. As web services use standardized XML for information exchange, they are usually independent of the languages and technologies in which the devices are built. XML stands for eXtensible Markup Language. Java web service is a method of communication between the client and server applications using HTTP over the World Wide Web through WSDL.
There are two primary types of Java Web Services:
It is one of the most popular Java Web Services interview questions that recruiters ask. The major web services components are:
Many Java Web Services interview questions are about explaining certain terms.
In the context of web services, the term interoperability refers to the ability of systems to work in tandem without any special requirements. It is a fundamental characteristic of web services. It implies that communication, data sharing, and services amongst applications remain the same across different platforms.
A web service protocol stack is a protocol stack that defines, locates, implements, and makes web services interact with one another. It is a stack of computer networking protocols.
Web service protocols form an integral part of Java Web Services interview questions in any tech interview. Therefore, you must not miss out on them when preparing sample Java Web Services interview questions.
There are four layers in the web service protocol stack. Every layer is associated with specific functions:
Service Transport: Service transport is first in the web service protocol stack. It transports XML messages to various client applications. The protocols used by the layer are:
XML Messaging: The messages are encoded in the XML format in this layer. It consists of:
Service Description: This layer comprises various XML messaging functions, locations, and data types. It includes the WSDL interface format.
Service Discovery: This layer helps publish and find devices and web services over the Web. It includes UDDI.
This is one of the most common Java Web Services interview questions for any tech interview. Ensure that the answer is precise and to the point.
UDDI stands for Universal Description Discovery and Integration. It is an XML-based standard under the service discovery layer of the web service protocol stack. It employs the use of Web Service Description Language (WSDL).
UDDI acts as a directory and helps in the registry for web services worldwide over the web.
The primary features of UDDI are:
Applications require a set architecture that ensures whether the application is working as designed. Similarly, web service architecture comprises the operations between two different applications running on various platforms and frameworks. These are supported by a different standard called web service. The architecture of web service involves the interaction of three roles:
SOAP or Simple Object Access Protocol is an XML-based protocol to access web services. It allows the interchange of data or information between two devices using request and XML-based protocols like HTTP, SMTP, and more.
The advantages of SOAP are:
The SOAP message is an XML document consisting of three parts:
It is important to practice RESTful web services interview questions and answers in Java for tech interviews.
REST stands for Representational State Transfer. RESTful web services are used for producing loosely coupled applications over HTTP. The main advantages are:
This is also among Java’s most popular RESTful web services interview questions and answers.
Yes, there are multiple advantages of using RESTful services over SOAP, for instance:
This is one of the most common web service security interview questions in Java. You must briefly describe the security issues as well.
The three primary security issues of web services are:
EIS stands for Entrust Identification Service. The Entrust Security platform generates EIS. It allows the corporates to handle and control the identities trusted to perform web service transactions.
EPS refers to Entrust Privacy Service, which deals with security and confidentiality by encrypting data. It ensures that only authorized parties can access the data.
The commonly implemented Java Web Services frameworks are:
XML-RPC is an XML-based protocol. It is simple and helps exchange information between two devices over a network. It is compatible with Perl, Java, Python, and C.
JAXM is a SOAP-based standard to send XML documents from the Java platform over the internet. It can also work with higher-level messaging protocols. This can be done by adding the protocol’s functionality on top of the SOAP.
There are three JAVA packages in the JAXB binding framework:
The applications that are already executing JAXB architecture cannot use these APIs.
Java API is for the XML pack. For different web services development, it integrates all the programming interfaces by SUN. JAX Pack is a bundle of JAXM, JAXB, JAX-RPC, and JAXR. It includes the documentation for support for the WSDL, XSLT, SAX, DOM.SOAP, EBXML, UDDI standards.
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Following are sample Java Web Services interview questions for coding interviews that you can practice.
This completes our list of various Java Web Services interview questions asked in software developer interviews. Practice these interview questions to crack FAANG interviews!
Q1. Why do we need Java Web Services?
Java web services allow applications to communicate and share data among themselves. For example, .Net can communicate to Java and vice versa. These web services allow the application and technology to work independently.
Q2. Is REST API a web service?
REST APIs are a form of Web Service API. A REST API is a Web Service API architecture approach that is standardized. The use of HTTP methods to make a network request is one of the requirements for being a REST API.
Q3. What is SOAP in web services?
SOAP is an XML-based communications technology for transmitting data between two computers over the internet. Because SOAP messages are entirely generated in XML, they are independent of platform and language. An Envelope that marks the message’s start and end is included in a SOAP message.
Q4. Are Java Web Services interview questions asked at Java fresher interviews?
As a fresher, you are expected to know the primary applications of Java, and web services are one of them. Thus, Java Web Services interview questions are important for freshers and experienced developers.
Q5. What are the web services that Java has to offer?
The various web services that Java provides are REST web service, SOAP web service, JAX-WS, JAX-RS, and more.
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