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jvisualvm to debug deadlocks in Java

This extends JConsole for debugging deadlocks in Java applications, using jvisualvm that gets shipped with your JDK. Step 1: Java code that creates a dead lock situation by a) thread-0 holding on to lock1 and waiting for the lock2, … Read more ›...

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Linear & Binary Search in Java

Q. Can you write a code to search for number 5 in 7 3 6 8 2 9 5 4? A. The code below uses the linear search algorithm. The linear search algorithm’s two advantages are simplicity and the ability to search either sorted or unsorted one-dimensional arrays. … Read...

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LinkedList creating from scratch in Java

Q. How to create a LinkedList from scratch A. Adding Removing Step 1: The node that stores the data and the reference to the next Node. … Read more ›...

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Maven and Cobertura Tutorial

Cobertura is a free code coverage tool, which calculates the percentage of Java code accessed by unit tests.

Step 1: The pom.xml file with the relevant reporting plugins. The properties also shown to set the coverage percentage and to skip code coverage or not.

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Monitoring/Profiling Java applications interview Q&A

Q1 How will you go about monitoring your Java application for potential performance or memory issues? A1 1. Visual VM for monitoring Java memory, CPU, threads, etc VisualVM is a visual tool integrating several command-line JDK tools and lightweight profiling capabilities. Designed for both production and development time use, …...

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Multi-tenant Architecture Interview Q&As

Single-vs-multi-tenant-architecture

Q1. What is a multi-tenant architecture? A1. A “tenant” in cloud computing is a single customer or to be more specific a group of users who share a common access with specific privileges to the software instance. … Read more ›...

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Palindrome

Q1. Can you write a function to determine if a given string input is a palindrome? A palindrome is a word or sentence that reads the same forward as it does backward. For example, the terms “racecar”, “dad”, “madam” and the name “Hannah”. The longest palindromic substring of “bananas” …...

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Part #3: JPA Hibernate Spring Maven Eclipse Tutorial – testing data access with HSQLDB

This tutorial focuses on testing data access logic with spring-test and hsqldb. This extends Part #2: JPA Hibernate Spring Maven Eclipse Tutorial – JPA configs and repository Testing the mapping of entities managed by hibernate and wiring up of JPA, Hibernate, etc via Spring. Schema and mock data similar to...

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Part 1: Badly designed Java classes & interfaces

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. … Read more ›...

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Part 2: Badly designed classes & interfaces – Single Responsibility Principle (SRP)

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. … Read more ›...

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Part 3: Badly designed classes & interface – Open Closed Principle (i.e OCP)

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Closed Principle | Part 4: Dependency Inversion Principle. … Read more ›...

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Part 4: Badly designed classes & interfaces – Dependency Inversion Principle (i.e. DIP)

4 Part practical design concept series Part 1: Abstraction | Part 2: Single Responsibility Principle | Part 3: Open Close Principle | Part 4: Dependency Inversion Principle. … Read more ›...

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Prerequisite: if want to work with Maven & eclipse

Here are the basic steps as to how I set up “passing” project using maven & eclipse for the coding exercises. If you are using other IDEs or command line approach then you can ignore this prerequisite. Just create the relevant packages and copy the classes in the passing the test exercises.

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300+ Java Interview Questions - FAQs

Java Interview FAQs 300+
Java FAQs - 01: Prepared?
(2)
Java FAQs - 02: Ice Breaker
(5)
Java FAQs - 03: Core Java
(15)
Java FAQs - 03 Java 9 to 25
(8)
Java FAQs - 04: OOP & FP
(10)
Java FAQs - 05: JEE
(12)
Java FAQs - 06: Spring
(10)
Java FAQs - 07: Hibernate
(4)
Java FAQs - 08: Web Services
(6)
Java FAQs - 09: Microservices
(12)
Java FAQs - 10: Messaging
(4)
Java FAQs - 11: Architecture
(5)
Java FAQs - 12: RDBMS
(2)
Java FAQs - 13: SQL
(6)
Java FAQs - 14: Code Quality
(4)
Java FAQs - 15: Key Areas
(14)
Java FAQs - 16: UML
(1)
Java FAQs - 17: GIT
(4)
Java FAQs - 18: Linux
(3)
Java FAQs - 19: DevOps (CI/CD)
(9)
Java FAQs - 20: AWS (Cloud)
(5)
Java FAQs - 21: Maven
(1)
Java FAQs - 22: Regex
(2)
Java FAQs - 23: JSON & XML
(3)
Java FAQs - 24: JMeter
(2)
Spring & Hibernate Interview FAQs
Framework - Hibernate Q&As
(13)
Framework - Spring Core
(6)
Framework - Spring MVC
(7)
Framework - Spring Cloud
(1)
Framework - Spring boot
(4)
Framework - Spring IO
(1)
Framework - Spring Config
(5)
Java Architect Interview FAQs
Architecture - Patterns
(10)
Architecture - How to
(17)
Architecture - AWS
(10)
Architecture - Azure
(6)
Architecture - Distributed
(8)
Architecture - Microservices
(11)
Architecture - Networking
(6)
Architecture - QoS
(1)
Architecture - ERD
(1)
Architecture - ETL
(3)
Architecture - Low Latency
(6)
Architecture - UML
(1)
Java code quality interview Q&As
Code Quality - Automation
(1)
Code Quality - Code Coverage
(2)
Code Quality - FAQs
(7)
Code Quality - Profiling
(3)
Code Quality - Performance
(2)
Code Quality - Unit Testing
Code Quality - BDD
(4)
Code Quality - JMockit
(15)
Code Quality - Mockito
(4)
Code Quality - Unit Testing FAQs
(3)
Code Quality – Testing DAOs
(4)
Code Quality – JUnit & Mockito
(6)
Code Quality – JUnit Web
(2)
Code Quality - Spring TXN
(2)
Java coding interview Q&As
Coding - Can you write code?
(22)
Coding - Complete the code
(13)
Coding - Converting from A to B
(6)
Coding - Designing your classes
(9)
Coding - Data Structures
Coding - Arrays
(2)
Coding - Big O notation
(2)
Coding - Graph Structure
(2)
Coding - LinkedList Structure
(2)
Coding - Map Structure
(1)
Coding - Pointer Algorithms
(3)
Coding - Queue Structure
(1)
Coding - Searching Algo
(1)
Coding - Sorting Algo
(4)
Coding - Stack Structure
(1)
Coding - Tree structure
(14)
Coding - Data Which & Why
(2)
Coding - Passing the unit tests
(5)
Coding - What is wrong?
(10)
Coding - Home Assignments
(8)
Coding - Written Test Core Java
(4)
Coding - Written Test JEE
(1)

Tutorials on Java & Big Data

Tutorials - Golang
5
Tutorials - Big Data
TUT - ⏯ Starting Big Data
2
TUT - Starting Spark & Scala
10
TUT - Starting with Python
2
TUT - Pig
3
TUT - Apache Storm
3
TUT - Spark Scala on Zeppelin
14
TUT - Cloudera
4
TUT - Cloudera on Docker
21
TUT - File Formats
8
TUT - Spark on Docker
8
TUT - Flume
2
TUT - Hadoop (HDFS)
5
TUT - HBase (NoSQL)
5
TUT - Hive (SQL)
1
TUT - Hadoop & Spark
16
TUT - MapReduce
3
TUT - Spark and Scala
2
TUT - Spark & Java
14
TUT - Apache Kafka
8
TUT - Hadoop
1
TUT - PySpark on Databricks
28
TUT - Zookeeper
2
Tutorials - Enterprise Java
TUT - Starting with Java
22
TUT - ⏯ Java Video Tutorials
TUT - ⏯ Starting with Java
12
TUT - ⏯ Spring Core
1
TUT - ⏯ Spring MVC
5
TUT - ⏯ JDBC, Hibernate
6
TUT - ⏯ Spring Boot
2
TUT - ⏯ Angular with Spring
TUT - ⏯ Q&As
2
TUT - Diagnosis
2
TUT - Akka
TUT - Akka Scala
3
TUT - Akka Java
6
TUT - AWS EC2
4
TUT - CI/CD Jenkins
3
TUT - Core Java
TUT - Debugging
4
TUT - Java 8
4
TUT - JSON and Java
1
TUT - Java Beginner
1
TUT - XML and Java
8
TUT - CSV and Java
2
TUT - Docker
9
TUT - Java gRPC
3
TUT - JEE
TUT - Web & Web Services
7
TUT - REST Client
1
TUT - JSF
1
TUT - JDBC
5
TUT - FIX and Java
3
TUT - JAXB
8
TUT - JMX
1
TUT - JPA
1
TUT - MySQL
1
TUT - Scala
TUT - Scala Actors
1
TUT - Spring & Hibernate
TUT - Hibernate
2
TUT - Spring Basics
10
TUT - Spring batch
3
TUT - Hibernate & Spring
5
TUT - Spring Boot
6
TUT - Spring IO
1
TUT - Spring ORM
2
TUT - Spring other
2
TUT - Spring OXM
2
TUT - Spring Cloud
9
TUT - Tools
TUT - JMeter
3
TUT - Maven
4
TUT - Maven Assembly
2
TUT - Maven Profiles
1
TUT - Productivity Tools
9
TUT - Apache Kafka
3
TUT - Redis Tutorial
2
TUT - Kubernetes & Docker
5
TUT - Other
TUT - SQL
3
TUT - Drools
5
TUT - Apache POI
3
TUT - DOS
2
TUT - Dozer
2
TUT - ESB
1
TUT - Groovy
3
TUT - Jasper Reports
4
TUT - Logging and auditing
6
TUT - Metrics
2
TUT - Orika Mapping
2
TUT - Pentaho Kettle ETL
4
TUT - Linux
7
TUT - Webspeher MQ
3
TUT - YAML
1