Java is a general-purpose, concurrent, class-based, object-oriented computer programming language that is specifically designed to have as few implementation dependencies as possible.
Developers can “write once, run anywhere” (WORA), meaning that code that runs on one platform does not need to be recompiled to run on another. Java applications are typically compiled to bytecode (class file) that can run on any Java virtual machine (JVM) regardless of computer architecture.
Java
Most Java developers find TwelveMonkeys the same way: ImageIO won’t read some format, a quick search turns it up, a few JARs go on... If you have ever opened a PDF in a hex editor at 2am trying to work out why a font is missing or why... Java’s built-in javax.imageio.ImageIO has been the default image library since J2SE 1.4. It reads and writes JPEG, PNG, BMP, GIF, and TIFF (from JDK... Table of Contents Intro: What a PDF Actually Is 1: PDF Objects and Data Types 2: Structure of a PDF File 3: Create a... TL;DR Java has no native PDF support, so you need a library. Apache PDFBox is free and adequate for basic extraction, and iText adds... TL;DR Watermarking a PDF allows you to add branding, ownership information, or document status indicators onto your pages. While libraries like Apache PDFBox and... 
