LDAP authentication in Java
In this tutorial, we share the common code block that is used to connect to an LDAP server in Java. 1. InitialDirContext To connect to an LDAP server, you can...
Category: Java core
How to return a custom class from Hibernate query
Hibernate is one of the most popular ORM frameworks in Java. Through Hibernate, developers deal with Java POJOs for doing CRUD operations on the database. In order to return a...
Java – Convert Object to Map
This tutorial provides several ways of converting a Java object to a Map in Java. 1. Reflection The traditional way of converting a Java object to a Map is through...
How to create a jar file with a package structure
This tutorial allows you to archive a list of compiled classes residing under a particular package in the form of a JAR file. Suppose you have 2 classes A.class &...
How to download a zip file in Java
In our previous article, we showed how to download a file of any type from a servlet. Now for zip files, things are a bit different, in this tutorial, we...
How to create a zip file in Java
In this tutorial, we show how to create a zip file from multiple files in Java. 1- ByteArrayOutputStream & ZipOutputStream Using ByteArrayOutputStream and ZipOutputStream classes provided by the JDK, you...
How to convert multi-page TIFF to PDF in Java
This tutorial provides a very efficient way to convert a multi-page TIFF to PDF using iText library. The below utility method accepts a multi-page TIFF file as an input and...
How to implement an auto reloadable XML using Apache VFS
XML is usually used to store light configuration that controls the business flow or the layout of an application, it’s meant to be managed by business users in the production...
How to write to a plain text file in Java
This tutorial shows several ways to write content to a text file in Java. The techniques used below are pure JDK and don’t use external libraries. 1- BufferedWriter The most...
How to read a plain text file in Java
This tutorial shows several ways for reading plain text files in Java. The techniques we use here are totally JDK built-in and don’t depend on external libraries. 1- BufferedReader The...
How to read input from console in Java
This tutorial shows several ways for reading input from a console in Java. Before listing the ways, it’s worth to define System.in as it’s used by most reading ways. System.in...
How to modify XML using DOM in Java
Although the main purpose of XML documents is to store lightweight data for faster processing, they are still used in some small applications as a data store which requires dynamic...
How to read XML using STAX parser
STAX is yet another parser for reading and parsing XML documents in Java, it is very similar to SAX where they both parse the XML document on call and provide...
How to read XML using SAX parser
In the previous article we talked about DOM parser and provided different examples for parsing and reading elements of an XML document. SAX parser is yet another XML parser provided...
How to create XML file in Java
In this tutorial, we show how to create a new XML file using DOM parser provided by JDK. We’re going to create an XML called students.xml which lists students along...
How to read XML file in Java
This tutorial shows how to read and parse an XML file in Java using a DOM parser. 1- Define XML file Consider we have the following Students.xml file: <students> <student...
ClassNotFoundException vs NoClassDefFoundError
ClassNotFoundException and NoClassDefFoundError occur when a required class is not found in the classpath at runtime. In this tutorial, we resolve the conflict between these 2 exceptions and explain the different...
How to iterate a Map in Java
This tutorial shows several ways for iterating a Map in Java. 1- Entry Set The common way for iterating a Map in Java is through entrySet() method as the following:...
How to iterate a List in Java
This tutorial shows several ways for iterating a List in Java. 1- Typical For loop Using a typical For loop, you can iterate a List as the following: private static...
ArrayList vs Vector
ArrayList and Vector collections are used interchangeably for storing several items with the same type inside the memory. In this tutorial, we list the major similarities and differences between these 2...
