Open Source Libraries Tutorial

Why Open Source Libraries? Open source libraries save thousands of hours. Instead of reinventing the wheel, you add a JAR (or a Maven/Gradle dependency) and get production-tested ...

What is iText? iText is a powerful open source Java library for creating and manipulating PDF documents. You can generate invoices, reports, e-books and forms entirely in code, ...

What is Apache POI? Apache POI is the Java library for Microsoft Office formats. The most used component is XSSF , which handles Word/Excel 2007+ files (xlsx). The older HSSF ...

Why Log? System.out.println is not logging. A logging framework gives log levels, formatters, file output, rotation and the ability to turn categories on and off at runtime. This ...

Logback Replaces Log4j 1.x Logback is the natural successor to Log4j and is the native backend of SLF4J. It is faster, supports automatic reloading of configuration, and comes ...

What is Quartz? Quartz is a full-featured job scheduler for Java. It can run jobs on cron-like schedules, fire a job a fixed number of times, persist jobs in a database and ...

What is JavaMail? JavaMail (jakarta.mail / javax.mail) is the standard Java API to send and receive email using SMTP, POP3 and IMAP. With it, your application can send welcome ...

What is JMF? Java Media Framework (JMF) is an older Sun API that lets Java programs capture, play, process and stream audio and video. It was designed for desktop applications and ...

What is AspectJ? AspectJ extends Java with aspect-oriented programming (AOP): code that cross-cuts many classes - logging, security checks, transactions, performance timing - ...

What is JFreeChart? JFreeChart is a Java library for drawing charts: pie, bar, line, XY, area, time series and more. Combined with Swing or PNG/SVG export it is ideal for reports ...

How to Pick a Library Activity - is it still maintained? Check commits and releases in the last year. License - MIT/Apache are permissive; GPL can affect commercial distribution. ...