The question I very often have is: which objects (recursively) are loaded in memory if a particular object is created?

If you know Call Hierarchy plugin, you will find the Data Hierarchy very similar. It searches selected Java classes for declared fields, and starting with the found "Data" it recursively looks for fields which are declared on found classes ("Hierarchy"). ...

The Open Identity Connectors Framework and Toolkit (OpenICF) is built to help drive development of Connectors. Connectors provide a consistent generic layer between applications and target resources.

The fully opensource project contains an evolving Role Playing Game framework and game implementations. It is written fully in Java in the tradition of old school RPGs like Wizardry 7 and EOB. Features are OpenGL, AI, scripting, turn based combat, commanding a group of characters and more....

AcrIS is modern framework serving as a base for applications, web sites and portals. It provides various tools and libraries to ease daily development. Synapso is using AcrIS as a platform for building dynamic web sites.

Morcego is a 3D network browser written in Java and released under LGPL license. It can be embedded in web applications using XMLRPC no represent graph-like data and browse nodes.

The Bioclipse project is aimed at creating a Java-based, open source, visual platform for chemo- and bioinformatics based on the Eclipse Rich Client Platform (RCP). Bioclipse, as any RCP application, is based on a plugin architecture that inherits basic functionality and visual interfaces from Eclipse, such as help system, software updates, preferences, cross-platform deployment etc....

BlackRay is a relational database system designed to offer performance features commonly associated with search engines. It offers SQL support and sophisticated operational and management features. Load-balancing and operational stability by means of N+1 redundance are included. ...

A set of back end services riding on top of Apache Sling in order to power a Collaboration and Learning Environment (Sakai) for higher education.

Apache XML Graphics Commons is a library that consists of several reusable components used by Apache Batik and Apache FOP. Many of these components can easily be used separately outside the domains of SVG and XSL-FO. You will find components such as an XMP metadata framework, a PDF library, an RTF library, Graphics2D implementations that let you generate PDF & PostScript files, and much more....

JSch allows you to connect to an sshd server and use port forwarding, X11 forwarding, file transfer, etc., and you can integrate its functionality into your own Java programs.