Web services Interview Questions

Web Services Interview Questions.
This blog is just for revision.

• What is SOAP Web Services

SOAP ( simple object access protocol) based web services (application exchange information over network)  .

• What is Contract first ?

WSDL or XSD is created first , then the java classes .

• What is WSDL ?

WS Description Language , it describes a web service .

• What are the parts of wsdl ?

1. types : data types used 
2. message : request and response
3. portType : operations available
4. binding : 
5. Operations:
6. Service :

Types

Schema

Contract namespace

Schema location xsd

Message can be multiple

Part

Name

Element

Type


Port type
Operation
Input, output,fault



Binding
Style document/ RPC transport
Operation
Input
Header, body
Output
Header,body
Fault
Fault

Service
Port
Binding
Location

• What is XSD ?

It defines schema which defines structure of xml.

• Explain wsdl2java

Use pluggin cfx-codegen-pluggin
Goal wsdl2java
Wsdl location
Binding files
Note : wsdl will have xsd,a java class for each xsd will be generated.

• What are the elements of soap message?

1. Envelope
2. Header
3. Body
4. Fault

•  What are SOLID principles in Rest Web services Development ?

1. Single Responsibility : Each class has only one function 
2. Open for Extension Closed for Modification : existing classes should not be modified , instead new classes should be created .
3. Liskov Substitution Principle :  App should work fine if we substitute subclass in place of super class .
4. Interface Segregation : large interfaces should be divided into smaller ones .
5. Dependency Inversion : loose coupling .