java Archives | Codesnipeet

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 cases. Understanding their differences is crucial for making the right…

Jewel Chowdhury September 1, 2024

Interview Questions INTERVIEW Java

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 to store it in a file or send it over…

Jewel Chowdhury June 7, 2023

jsp Java Java Advanced

[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 a common error while working on maven based hibernate project.…

Jewel Chowdhury May 29, 2022

Java Java Advanced

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 will see how to solve this. Exception in thread "main"…

Jewel Chowdhury May 29, 2022

Java Java Advanced jsp

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 a result, we have to create the web.xml file manually.…

Jewel Chowdhury May 26, 2022

Java Java Advanced jsp

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 servlet. This example will display the personalized error messages on…

Jewel Chowdhury May 26, 2022

Java Java Advanced jsp

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 will use how to send redirects from Java Servlet. At…

Jewel Chowdhury May 24, 2022

Java jsp

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 servlet. In this example, we will apply CSS within the…

Jewel Chowdhury May 24, 2022

Java Java Advanced jsp

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. In this example, we will display a list of object…

Jewel Chowdhury May 22, 2022

Java Java Advanced jsp

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 servlet. In this example, we will display data from the…

Jewel Chowdhury May 22, 2022

jsp Java Java Advanced

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 servlet. In this example, we will insert data in the…

Jewel Chowdhury May 22, 2022

Java Java Advanced

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 to tell you shortly what exactly web scraper is? Web…

Jewel Chowdhury February 24, 2022

How do I populate a drop down with a list using thymeleaf and spring

Bugs Java

[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 org.hibernate.impl.SessionImpl.firePersist(SessionImpl.java:799) at org.hibernate.impl.SessionImpl.persist(SessionImpl.java:791) …

Jewel Chowdhury November 7, 2021

Java

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 to spring initializer to generate a spring boot project. Spring…

Jewel Chowdhury September 5, 2021

Interview Questions Java Java Basic

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 that. So, I will show how to convert an Array…

Jewel Chowdhury July 7, 2021

Interview Questions Java Java Advanced

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 by value with examples. Let’s create Person class: package com.example; public…

Jewel Chowdhury July 6, 2021

Java Advanced Java

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 NullPointException is a RunTimeException. NullPointException is thrown when the value…

Jewel Chowdhury July 6, 2021

Java Java Basic

Operators in Java Explained

Operator are those who performs an action, for example + is an arithmetic operator that perform addition. They are various types of operators are available in java programming language. Types of…

Jewel Chowdhury June 20, 2021

Java Java Basic

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 tightly typed language, you must define the datatype of variables…

Jewel Chowdhury June 20, 2021

Java Java Basic

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, for example, the variable name is I and the value…

Jewel Chowdhury June 20, 2021