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Q511. What does the following exception means

org.hibernate.LazyInitializationException: could not initialize proxy - no Session

Hibernate

Ans. The error states that Hibernate is not able to initialize proxy / dependent entity objects as there is no session or transaction present. Very likely we are trying to load the dependent entities lazily but the call to dependent object property is not wrapped within the session or transaction.

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Q512. If we would like to load just the mapping id for the mapped entity in some cases and whole entity in some cases, because we would like to lazily initialize the dependent entity in some case and not load the entity at all in some case, how can we accomplish that.

For example -

Employee entity is mapped to department entity through department id. We want that when we load employee.getDepartment().getDepartmentId(), it shouldn't load the complete department object but just the Id.

Hibernate

Ans. a

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Q513. If we would like to load just the mapping id for the mapped entity, how can we accomplish that.

For example -

Employee entity is mapped to department entity through department id. We want that when we load employee.getDepartment().getDepartmentId(), it shouldn't load the complete department object but just the Id.

Hibernate

Ans. We can use

@AccessType("property") for getDepartmentId() method within Department class in that case.

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Q514. Can we have 2 entity fields mapped to the same column in Hibernate ?

Hibernate

Ans. No, it's not legal in hibernate. 1 column should be mapped to only one field in entity.

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Q515. What is Amazon S3 ?

Amazon Web Services (AWS)

Ans. Amazon Simple Storage Service or S3 is object storage with a simple web service interface to store and retrieve any amount of data from anywhere on the web.

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Q516. Where do you see yourself in next 5 years?

General

Ans. Sample Answers -

Getting better with upcoming technologies and be a Lead developer.

In accordance with the company, working as a permenant employee.

Be an associate architect.

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Q517. What is Exception Wrapping ?

Ans. Exception wrapping is wrapping an exception object within another exception object and then throwing the outer exception.

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Q518. Which is your favorite Design pattern, each in Creational , Structural and Behavioral and Why ?

Design

Ans. [Open Ended Answer]

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Q519. Name few Behavioral Design Patterns ?

Design

Ans. Interpreter,Chain of Responsibility,Command,Iterator,Observer,Mediator,Memento

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Q520. Name few structural Design Patterns ?

Design

Ans. Adapter,Bridge,Composite,Decorator,Facade,Flyweight,Proxy

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Q521. Name few creational design patterns ?

Design

Ans. Factory,Abstract Factory,Singleton,Prototype and Builder

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Q522. What is cloning in GIT ?

GIT

Ans. Cloning is the process of making a copy. It could be creating local copy of another local repository or local copy of remote repository.

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Q523. What is the difference between GIT Commit and Push ?

GIT

Ans. Git commit commit the changes to local repository whereas Push commits the changes to Remote repository.

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Q524. How are the concept of Association related to Composition and Inheritance ?

Core Java

Ans. Composition and Inheritance are the different types of Associations for Classes.

Composition is a has-a association between classes.
Inheritance is a is-a association between classes.

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Q525. What are the core OOPs concepts ?

Core Java

Ans. Abstraction, Encapsulation, Polymorphism , Composition and Inheritance

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Frequently asked Spring interview question.

Q526. What are the components of Spring framework ?

Spring

Ans. Core: [Core, Bean, Context, Expression Language]

Web: [Web, Portlet, Servlet, etc]

Data Access [JMS, JDBC, etc]

AOP, Aspect

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Q527. What are the methods to connect to database in Java ?

Database

Ans. JDBC ( Java Database Connectivity ),ODBC (Open Database Connectivity), Hibernate, JPA ( Java Persistence API ), JOOQ,MyBatis

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Q528. What is the difference between && and & in Java ?

Core Java

Ans. && is a Logical whereas & is a bitwise operator

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Q529. Describe Catalog subsystem and the tables used in WCS for managing this ?

IBM WCS

Ans. The catalog subsystem or Catalog Management provides online catalog navigation, partitioning, categorization, and associations. In addition, the catalog subsystem includes support for personalized interest lists and custom catalog display pages. The catalog subsystem contains all logic and data relevant to an online catalog, including catalog groups (or categories), catalog entries, and any associations or relationships among them.

Tables used for Catalog subsystem

1. CATENTRY
2. CATENTREL

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Q530. What is an Attribute Dictionary and What are its benefits ?

IBM WCS

Ans. Attribute dictionary is a set of common attributes that can be reused by multiple products.

The attribute dictionary provides a central place to manage shared attributes, with the following features:
The ability to standardize attributes.
The ability to easily compare attributes shared by products and SKUs.
The ability to quickly change attributes in one place to affect all catalog entries.

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Q531. How to enable Cross Site scripting protection in WCS ?

IBM WCS

Ans. By specifying XSiteScriptingProtection within wc-server.xml. Prohibited characters and attributes are specified within XSiteScriptingProtection to protect the application from any XSS attach.

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Q532. Difference between Singleton and Factory Design Pattern ?

Design

Ans. Both are creational design patterns but singleton facilitates in creation and reuse of single object whereas Factory deals with creation of multiple objects.

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Q533. What is a fetch mode in Hibernate ?

Hibernate

Ans. It specifies an association fetching strategy. It could be DEFAULT, JOIN or SELECT as following

@Fetch(FetchMode.SELECT)

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Q534. Difference between save and flush in Hibernate ?

Hibernate

Ans. Save is used to save the entity to the session whereas flush is to save the session content to DB.

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Q535. Write a Program to validate an email address

Core Java

Ans. public class Class{
public static void main(String[] args){
String str = "xyz@123.com";

if(!str.contains("@") && !str.contains(".") && (str.indexOf('.') < str.indexOf('@'))){
System.out.println("Not a Valid Email Address");
}
}
}

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Q536. Upon compiling the following class, What .class files will get created

public class OuterClass{
class InnerClass{
}
}

Core Java

Ans. OuterClass.class AND OuterClass$InnerClass.class

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Q537. Write a Program to print factorial of a number using recursion

Core Java

Ans. public class BuggyBread {
public static void main(String args[]) {
System.out.println(factorial(5));
}

private static int factorial(int number){
if(number == 1){
return 1;
} else {
return number * factorial(number - 1);
}
}
}

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Q538. What are the different operators in Java ?

Core Java

Ans. && - AND
|| - OR
! - LOGICAL NOT

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Q539. What are the different primitive data types in Java ?

Core Java

Ans. boolean
byte
char
double
float
int
long
short
void

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Q540. What is the difference between circular queue and priority queue ?

Data Structures

Ans. https://qr.ae/TWK2Ok

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