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01B: ♦ 40+ Java Microservices & Web services Interview Q&As – Q07 – Q12

Extends Java Web Services Basics Interview Q&As – Q17 – Q06. Q7. What is a microservice architecture (aka MSA)? A7. Martin Fowler defines Microservices as a subset of Service Oriented Architecture (SOA). In SOA, the services can be of any size. In a microservice, the service performs a single function.…...

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10: SOAP Web Service Styles Interview Q&A

Q1. What is the difference between the “RPC” and “Document” styles in SOAP? A1. There are two communication style models that are used to translate a WSDL binding to a SOAP message body. In RPC style, the body of the SOAP request body must contain both the 1) “operation name…...

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07: HATEOAS RESTFul Service with Spring tutorial

Step 1: Create a Maven project structure

Step 2: pom.xml to get right jars

Note that “spring-hateoas” is included. The “com.fasterxml.jackson.datatype” is required for the JSON processing. Step 3: Hello class with “ResourceSupport“

The “jackson-datatype-joda” aertifact brings in the dependency jackson libraries. @JsonCreator – signal on how…...

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11: ♥ JAX-WS how to create a SOAP web service in Java?

Step 1:Create the Java Maven project:

Step 2: Need the libraries/frameworks This example shows Apache CXF library as JAX-WS implementation with Spring and deployed to JBoss server 5.1.1.

Step 3: Web service interface with JAX-WS annotations Folder: src/main/java

Step 4: Implementation of Web service interface

Step

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03: ♥ JAX-RS how to create a RESTFul Web Service in Java?

Q. What are the high level steps in developing a RESTful web service in Java? A. You can see the complete tutorial in the tutorials section. This post is to quickly explain the major steps at the job interview. Knowing all the basics is of no use if you can’t

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08: REST constraints (i.e. design rules) interview Q&A

Q1. What are the 6 REST constraints? A1. REST constraints are design rules that are applied to establish the distinct characteristics of the REST architectural style. These constraints don’t dictate what kind of technology to use, and they only define how data is transferred between components and what benefits we…...

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05: RESTFul Web Service URI conventions with Spring MVC examples

The high level pattern for the RESTful URI is http(s)://myserver.com:8080/app-name/{version-no}/{domain}/{rest-reource-convetion} For example: http(s)://myserver.com:8080/accounting-services/1.0/forecasting/accounts to list  all the accounts. This is a plural resource returning a collections of accounts. The URI contains nouns representing the resources in a hierarchical structure. For example, if you want a to get a particular transaction…...

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06: RESTful Web services and HATEOAS Q&A

Q1. What is HATEOAS? How does it provide state transition, scalability, and loose coupling? A1. HATEOAS (Hypermedia as the Engine of Application State) is considered the final level of REST. This means that each link is presumed to implement the standard REST verbs of GET, POST, PUT, and DELETE (or…...

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