Why is `@PreAuthorize` is not working on Rest Controller in Springboot

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What is the difference between @Resource, @Inject and @Autowired in Spring Framework

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How to Fix the Java Exception java.lang.UnsupportedClassVersionError Unsupported major.minor version

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What is Execution context class in Java

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How to test RESTful Web Service (Controller) in Spring Framework Offline (No Server, No Database)

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What is the best way to mock an Java Azure EventHubProducerClient with Mockito

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How to Hit a HTTP POST API using JSON as a Request body in Java

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How to convert an integer to an array of digits in Java

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Why do we need interfaces in Java

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Convert MySQL database from MyISAM to InnoDB

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What is the difference between Hashtable and ConcurrentHashMap in Java

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How to resolve the Error return type is incompatible in Java

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What is CLASSPATH in Java

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How does synchronized work in Java

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How to use threads and recursion in Java to print Fibonacci numbers

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What is connection pooling in Java

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What is the best way to store passwords in Java

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How do you kill a Thread in Java

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What is mutex and semaphore in Java and its differences

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Why String is Immutable or Final in Java

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Are Synchronized Methods Slower In Single Threaded Applications in Java

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What is a SubString and Memory Leak in Java

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What is Encoding and Decoding in Java

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What are Maven Plugins

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Is it possible to use Object.wait(millisec) to simulate sleep in Java Threads

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Write a program to find Duplicate character in a String Java

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What is a Maven Repository

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What is the difference between Executors.newCachedThreadPool() and Executors.newFixedThreadPool() in Java MultiThreading

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Log4J Vulnerability (Log4Shell) Explained - for Java developers

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What is POM (Project Object Model) And Pom.Xml in Maven

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What are WebSockets and How is it different from HTTP

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What is Hibernate Interceptor in Java Application Development

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Is Oracle JDK Free again - for Java developers

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How to publish your local web server to internet without any port forwarding

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What are Primitive and Wrapper Classes in Java

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What is Web 3.0 Blockchain, Its building blocks, and Evolution of the Internet

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How to fetch top 10 trending hashtags from Twitter in India using twitter4j in Java

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What is Singleton Design Pattern in Java and Why it is used

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Should try...catch go inside or outside a loop in Java

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What is Servlet and How does it work

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What is the difference between @Mock and @InjectMocks

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How an AJAX Request works

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What is Race Condition In MultiThreading Java

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What is the difference between Junit and Mockito

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How to find a file recursively in Java

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Java IO - Interview Questions

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What is Synchronized in Java MultiThreading

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How to find age using date of birth in Java

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How to print Thread numbers in MultiThreading Java

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How to resolve 401 Unauthorized The request requires user authentication. The response MUST include a WWW-Authenticate header field (section 14.47) containing a challenge applicable to the requested resource in Java

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How to check the version of java installed on my computer

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What is join method used for in MultiThreading Java

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How to get the width and height of a string in Java

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Introduction to Java Thread Profiling

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How to convert date in to yyyy-MM-dd Format in Java

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What is isAlive method used for in MultiThreading Java

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Difference between Map and Flat Map

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How to create and run multiple threads using for loop

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Advanced Java Web Interview Questions And Answers

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How exception handling effects the performance in Java

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What is MultiThreading and How to create a thread in Java

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How to resolve the Error opening registry key Java

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Important JDBC Interview questions and answers for Java Developer interview

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Important Java 8 Interview Questions

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How to use java.net.URLConnection to send and handle HTTP requests

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keytool error Keystore was tampered with, or password was incorrect, generate a Self Signed JKS Certificate using keytool

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How to resolve "java.lang.OutOfMemoryError Java heap space" error

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The difference between the Runnable and Callable interfaces in Java

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How can an application use multiple cores or CPUs in Java

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How to do system design for a Movie Ticket Booking System like bookmyshow.com,fandango.com

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What is the difference between “implements Runnable” vs “extends Thread” in Java

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How to do low level system design for a Logging Framework like Log4J

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Wap to convert String of vowels and consonants into 0's and 1's and print the decimal value of the binary string in Java and Python

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Simple code Naming things and Naming Conventions

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How to calculate Java Objects, Arrays, Primitives, and Complex Classes. Checking calculated size correctness using JProfiler.

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How to Convert DOCX to HTML in Java

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How to remove substring from String in Java

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Java virtual Machine(JVM) and its architecture

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Can we restrict visibility of derived method in Java and What is visibility control in java

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What is Builder Pattern in Java

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What is java.lang.NoClassDefFoundError in Java and How to resolve it

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What Down casting in Java

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What is java.lang.ClassNotFoundException in Java and How to resolve it

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What are Access Specifiers in Java

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Wap to find if a Given Array is Monotonic in Java

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What is the difference between Data and Information

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How to remove duplicates and sort the array without using inbuilt functions like .sort or sorting algorithms from an unsorted array

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What are Data Structures and its examples

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WAP to find the sum of all the numbers in a list using in Java 8

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What is StringJoiner and its uses in Java 8 with an example

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What are Mathematical,Algorithmic Notations and Functions in Data Structures

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What are Arrays in Java

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How arrays are stored in the memory

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The Performance Impact of java.lang.System.getProperty()

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What is the Big-O notations of the Array operations

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Can You Override Static Method in Java

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What is a Bubble Sort & How does it work

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Data Structures - Selection Sort Algorithm

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Does Java Support Pass by Value or Pass by Reference

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Data Structures - Insertion Sort Algorithm

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Difference between Factory and Abstract Factory Design Pattern in Java

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Data Structures - Shell Sort Algorithm

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Data Structures - Merge Sort Algorithm

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Data Structures - Quick Sort Algorithm

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Polymorphism, Overloading, and Overriding in Java and Object Oriented Programming

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Data Structures - Counting Sort Algorithm

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What is Encapsulation in Java and OOP with Example

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Data Structures - Radix Sort Algorithm

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What is Inheritance in Java with example - Object Oriented Programming

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How to sort an array in Java

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What is Object in Java and Object Oriented Programming? Example Tutorial

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What is a List Data Structure in Java

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Difference between Inheritance and Composition in Java and Object Oriented Programming

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What is an ArrayList Data Structure in Java

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What is Linked List in Data Structures

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Protect Your Code From Bugs An Overview of Five Static Analyzers for Java Code

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What is Traversing, Searching Linked List in Data Structures

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What is Memory Allocation, Overflow and Underflow in Garbage Collection of Linked List Data Structures

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OOPs Concepts in Java with Basic Examples

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Lambda Expressions in Java

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Object-oriented Programming vs. Functional Programming Which Is Better?

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Fetching a DTO With a To-Many Association

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What is a Race Condition

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How to catch multiple Java exceptions in the same catch clause

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What are checked vs unchecked exceptions in Java

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Is it IllegalArgumentException or NullPointerException for a null parameter in Java

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How to find the minimum or least value in an Integer List using Java 8

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What is Association Mapping and examples of One to One, Many to Many and One to Many and Many to One relationships

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How to know which Java thread is hogging the CPU

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How many threads can a Java VM support

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What are important Threading Techniques & Concepts in Java

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Is it possible view/pause/kill a particular thread from a different java program running on the same JVM

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How to make your collections thread-safe?

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What are the best naming conventions for threads in Java

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In Java, do I need to declare my collection synchronized if it's read-only

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Heap and Stack Memory Errors in Java

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Pass a Parameter to All JVMs in A Machine at The Same Time

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Synchronizing on String objects in Java

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How many threads should I use in my Java program

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How to implement simple threading with a fixed number of worker Threads

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What is the difference between notify() and notifyAll() in Threads.

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What would make a single task executor stop processing tasks in Java Threads.

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How can you ensure a block of code can not be interrupted by any other Thread in Java

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How to test methods that call System.exit() in Java

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How are Java Thread priorities translated to an OS thread priority

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What are packages in Java

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How to parse logs written by multiple Threads

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What are the benefits of Performance Optimization in Java

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What is Garbage Collection Performance Tuning in Java

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What are the best Coding Practices to be followed while writing Java code in order to avoid performance issues

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How to create a memory leak in Java

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Why is processing a sorted array faster than processing an unsorted array in Java

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How to convert a String to an int in Java

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What are MVP and MVC and what is the difference between MVP and MVC

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What is a serialVersionUID and why should I use it in Java

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When to use LinkedList over ArrayList in Java

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What is the difference between StringBuilder and StringBuffer in Java

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Which concurrent Queue implementation, should I use it in Java

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How to avoid NullPointerException in Java

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How do I read / convert an InputStream into a String in Java

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What is the difference between a synchronized method and synchronized block in Java

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How to make an ArrayList Read Only in Java

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How do I efficiently iterate over each entry in a Java Map

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What are the differences between a HashMap and a Hashtable in Java

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What is a Java bean

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Java JDBC important interview questions

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Real time example of a singleton design pattern in Java

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What are available JDBC drivers and difference between them and when to use

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What are the steps to connect to a database using JDBC API

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What is statement, prepared statement and callable statement in JDBC and Why are they used

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What is final keyword in java

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What is Instance Initializer block in Java

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What is instanceof operator in Java

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What is transaction management and ACID properties in JDBC

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How to fetch multiple host names from config file management in Jenkins pipeline groovy script

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What is super keyword in java

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What is Covariant Return Type in java

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What is method overriding in Java

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What is method overloading in Java

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What is Polymorphism in Java

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How to Encrypt and Decrypt a file using CryptoJS AES encryption and Java AES decryption

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WAP to create a thread using lambda expression and print “Hello World” in Java

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Java interview question on interfaces implemented by class with same default method in two interfaces

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AES256 Exception in thread "main" java.security.InvalidKeyException Illegal key size or default parameters in Java

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Listagg function overflow error ORA-01489 in Java

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What is the difference between final, finally, finalize in Java

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In Java, what is the best way to determine the size of an object

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How do I generate random integers within a specific range in Java

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What is the difference between public, protected, package-private and private in Java

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Does Java support default parameter values

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What is the load factor of Hashmap in Java

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How to implement bubble sort by using only one for loop

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Why don't Java's +=, -=, *=, /= compound assignment operators require casting?

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Write a Comparator in Java to compare two employees based upon name, age and address

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How to break Singleton Design pattern in Java

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What is the difference between writing a property on application.yml or bootstrap.yml in spring boot

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How to add context path to Spring Boot application

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How does ternary operator work in java

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What is the best way of writing an integration test in Spring boot

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How to learn Java quick

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How to set active profile and config location from command line in spring boot

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How does the Java 'for each' loop work

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Why SpringBoot 2.2.2 Jackson serializer for custom pagination doesn't work

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What is the story behind Java

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Twitter Bootstrap Development Introduction

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What is multiple spring ApplicationContext in Java

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What is Dependency Inversion Principle in SOLID Design Principles of Object Oriented Programming

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SSL Configuration in Apache MINA Server

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An Introduction to Apache Mina Server

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What are SOLID Design Principles in Object Oriented Programming Java

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What is Single Responsibility Principle in SOLID Design Principles of Object Oriented Programming

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Tomcat Performance Tuning in Production Server

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MySQL Backup/Restore in Windows, Linux and using Java Program

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What is Open-Closed Principle in SOLID Design Principles of Object Oriented Programming

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Apache Mina - Simple Client/Server Application

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What is Liskov Substitution Principle in SOLID Design Principles of Object Oriented Programming

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Float, Double and BigDecimal with Financial Calculation

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Java new features that needs to be at your finger tips

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What is Interface-Segregation Principle in SOLID Design Principles of Object Oriented Programming

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