Java - Frequently used Java Libraries

List of most commonly used Java Libraries

• JUnit for unit testing
• Tomcat or Jetty as servlet container
• Spring for configuration and glueing code together
• Hibernate for object persistence
• C3P0 for database connection pooling
• Lucene for fulltext search
• Log4J for logging
• Apache Commons for a whole bunch of stuff: language utilities (see StringUtils), special collections, IO, file uploads, validation, etc.
• POI for reading/writing MS Office file formats
• PDFBox for manipulating PDFs
• Velocity for templating
• Bouncy Castle for Security/Cryptography
• JOrtho The Java Spell Checker