HashMap vs. TreeMap in Java: A Comprehensive Comparison

In Java, HashMap and TreeMap are two commonly used implementations of the Map interface, each serving distinct purposes and use…

Java Serialization: Can Static Values Be Serialized?

In Java, static values cannot be serialized directly. Serialization is the process of converting an object into a byte stream…

hibernate.cfg.xml location in maven project

[solved] hibernate.cfg.xml location in maven project

Hello guys, In this article, I will describe where you will keep the hibernate.cfg.xml file in your project directory. It’s…

java.lang.NoClassDefFoundError

How can I solve “java.lang.NoClassDefFoundError”

Hello guys, today we will show a common error while working on java based projects. This error is “java.lang.NoClassDefFoundError“. We…

web.xml File Location in Dynamic WebApp in Eclipse IDE

Hello friends, Sometimes when we are working with webapp in Eclipse, may not create the web.xml file by default. As…

How to Handle Error in Web.xml for Java Web Applications

Hello friends, Today I will show you how to handle the error or display customized error messages in JSP and…

How to send redirect from Java Servlet

Hello friends, Today I am going to show you how to send redirect from Java Servlet. In this example, we…

How to Apply CSS in out.println() method in JSP and Servlet

Hello friends, Today I am going to show you how to apply CSS in the out.println() method using JSP and…

How to display a list of objects in JSP through Servlet

Hello friends, Today I am going to show you how to display a list of objects using JSP and servlet.…

How to show data from MySQL database using JSP and Servlet

Hello friends, Today I am going to show you how to display data from the MySQL database using JSP and…

How to insert data in MySQL database using JSP and Servlet

Hello friends, Today I am going to show you how to insert data in the MySQL database using JSP and…

How to Build a Web Scraper in Java

Hello, Today we are going to build a web scraper. Although All of you know the term, I just want…

[solved] caused by: org.hibernate.PersistentObjectException: detached entity passed to persist:

The error looks like org.hibernate.PersistentObjectException: detached entity passed to persist: example.forms.InvoiceItem at org.hibernate.event.def.DefaultPersistEventListener.onPersist(DefaultPersistEventListener.java:127) at…

How to create Spring Boot Application 2021

Hi Devs, Today I am going to show you how to create a simple spring boot project from scratch. Go…

Convert array to ArrayList java

In this article, we are converting an array to ArrayList in Java. We will discuss three different ways to do…

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Java pass by reference

Is java pass by reference? The answer is NO. Java is always pass-by-value. Today we will learn java pass by reference and java pass…

Java Interview Question for beginners

Java null pointer exception

Today we will learn, What is a NullPointerException, and how do I fix it? So, let’s start: What is NullPointException…

Operators in Java Explained

Operator are those who performs an action, for example + is an arithmetic operator that perform addition. They are various types…

Data Types in Java Explained

In Java, data types refer to the type of data that can be stored in variables. Because Java is a…

Variables in Java Explained

A variable is a term that refers to a value that can be changed in the future. When I put int i=10,…