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"Morphia is a lightweight type-safe library for mapping Java objects to/from MongoDB: Easy to use, and very lightweight; reflection is used once per type and cached for good performance. Datastore and DAO access abstractions, or roll your own... Type-safe, and Fluent Query support with (runtime) validation Annotations based mapping behavior; there are no XML files. Extensions: Validation (jsr303), and SLF4J Logging"

"red-open is a sister project of redView. red-open is providing a Software Factory to transform models and generate code. red-open uses Eclipse Modeling (MWE, Xpand, Xtend to transform Domain Models (EMF, UML, XSD, Xtext) into other models like redView View Models. red-open also generates code and artifacts to generate RCP Prototyping apps, SWT Views, MockUp, Riena Navigation Assembly... "

redview.org: Riena EMF Dynamic Views for Business Applications and more

Great website for begginers in java (and not only). It goes from the very beginning to intermediate topics and simple game development.

"Jsvc is a set of libraries and applications for making Java applications run on UNIX more easily. Jsvc allows the application (e.g. Tomcat) to perform some privileged operations as root (e.g. bind to a port < 1024), and then switch identity to a non-privileged user. It can run on Win32 via the Cygwin emulation layer (see Cygwin for more information), however Win32 users may prefer to use procrun instead, which allows the application to run as a Windows Service. The sources are located in the src/native/unix subdirectory. In the future APR may be used to provide more portable platform support. "

"JAX-WS Reference Implementation Project. This project provides the core of Metro project, inside GlassFish community This project develops and evolves the code base for the reference implementation of the Java API for XML Web Services (JAX-WS) specification. The current code base supports JAX-WS 2.0 and JAXWS 2.1 but the project will track future versions of the JAX-WS specifications."

"Short screencasts that outlines features of applause, a domain-specific language (DSL) and code generator to produce native apps for iPhone, Android and BlackBerry. You can find this open-source project at code.google.com/​p/​applause"

"RHQ (formerly Jopr), is an enterprise management solution for JBoss middleware projects and other application technologies. This pluggable project provides administration, monitoring, alerting, operational control and configuration in an enterprise setting with fine-grained security and an advanced extension model. Jopr is part of the multi-vendor RHQ management project. It provides support for monitoring base operating system information on six operating systems as well as mangement of Apache httpd, JBoss Application Server, Tomcat and other related projects."

"Lightweight UI Toolkit makes it very easy to create compelling UI's that will look and behave the same on all devices using a programming paradigm similar to Swing and an advanced GUI builder/theme creation tool. This Toolkit is able to run on CLDC1.1 MIDP2.0/CDC PBP/SE, Blackberry, Java SE and was ported to several other platforms"

Magnolia, the open source content management vendor that delivers simplicity on an enterprise scale, today announced the release of Magnolia CMS 4.4, with new tools that enable enterprise web authors to collaborate in the quick creation of professional-grade, multi-lingual sites.

"The general architecture of Jackrabbit can be described in three Layers: A Content Application Layer, an API Layer and a Content Repository Implementation Layer."

"JCR v2.0 Specification (HTML version) Content Repository for Java Technology API Specification (JSR-283) "

"This page will be used to show solutions to common problems related to Apache Jackrabbit and the JCR API. These examples shouldn't be considered Best Practices - general error checking and exception handling have been omitted to keep the example code simple. "

This page contains the latest compiled builds of Pentaho Data Integration (Kettle) community edition.  The builds are based on source code downloaded daily from SVN. Why download these snapshot builds? You want the latest version - to get the latest features in PDI. You want a more stable version - PDI point releases (e.g. 4.0.1) can include important bug fixes - see the PDI JIRA system for a full list of known issues. You need a bug fixed - You're struggling with a critical bug which has been fixed in a more recent version. To save time - You haven't got the time and/or inclination to learn about how to download PDI from SVN and build your own version.

" Openbravo ERP REST consists of a framework offering security and exception services and a data access REST web service implementation. The data access (DAL) REST web services provide a CRUD-like web service so that external applications can retrieve, update, create and delete business objects through standard HTTP requests. "

"I encourage (actually I dare you) to those who have never even touched a portal to take the JBoss Portlet Bridge for a test drive. It takes 1 download (GateIn bundled with JBoss) and one maven archetype to get started. You can choose from any combination of plain JSF, Richfaces, and Seam with mvn archetype:generate -DarchetypeCatalog=http://bit.ly/jbossportletbridge from the command line."

"The Open Data Protocol (OData) is a Web protocol for querying and updating data that provides a way to unlock this data and free it from silos that exist in applications today. OData does this by applying and building upon Web technologies such as HTTP, Atom Publishing Protocol (AtomPub) and JSON to provide access to information from a variety of applications, services, and stores. Project Info odata4j is a new open-source toolkit for building first-class OData producers and first-class OData consumers in Java. "

" Apache SlingTM is an innovative web framework that is intended to bring back the fun to web development. Discussions about Sling happen on our mailing lists, see the Project Information page for more info. Apache Sling in five bullets points REST based web framework Content-driven, using a JCR content repository Powered by OSGi Scripting inside, multiple languages (JSP, server-side javascript, Scala, etc.) Apache Open Source project"

Caching is the most important performance optimization technique. There are many things that can be cached in persistence, objects, data, database connections, database statements, query results, meta-data, relationships, to name a few. Caching in object persistence normally refers to the caching of objects or their data. Caching also influences object identity, that is that if you read an object, then read the same object again you should get the identical object back (same reference). JPA 1.0 does not define a shared object cache, JPA providers can support a shared object cache or not, however most do. Caching in JPA is required with-in a transaction or within an extended persistence context to preserve object identity, but JPA does not require that caching be supported across transactions or persistence contexts. JPA 2.0 defines the concept of a shared cache. The @Cacheable annotation or cacheable XML attribute can be used to enable or disable caching on a class.

Each node in a Jackrabbit workspace tree has a node type that defines the child nodes and properties it may (or must) have. Developers can use node types to define a custom content model for their application domain and have Jackrabbit enforce the constraints of that model at the repository level.