DeepaMehta News

Jun 26, 2013
2nd DeepaMehta Development Meeting

Time and location:

  • June 26, 2013
  • 4pm-8pm
  • TU Berlin, Hardenbergstraße 36a, Room ER 136

The target group and the meeting's agenda is the same as with the 1st DeepaMehta Development Meeting.

May 22, 2013
1st DeepaMehta Development Meeting

On May 22 the 1st DeepaMehta Development Meeting takes place at Technische Universität Berlin. The meeting is aimed at developers who are interested in developing with the DeepaMehta platform. Ideally, actual (plugin) development projects are established while the meeting.


  • Very short DeepaMehta introduction
  • What a plugin can do -- the DeepaMehta development framework
  • Working groups

Time and location:

  • May 22, 2013, 4pm-8pm
  • TU Berlin, Hardenbergstraße 36a, Room ER 136

Background: the educationZEN applications and web interfaces are developed on top of the DeepaMehta software platform. educationZEN is a blended learning project taking place at Technische Universität Berlin.

Mar 28, 2013
4th DeepaMehta Community Lounge

On March 28, 2013, 18:00h we hold the 4th DeepaMehta Community Lounge in Berlin. The DeepaMehta developers and users showcase their applications, usage scenarios, and ideas. And we will celebrate the advent of DeepaMehta 4.1, the first release with long term support.

The agenda known so far:

  • Presentation of new features in DM 4.0.14 and 4.1
  • Showcase of current DM4 projects and applications
  • Outlook, ideas, questions and answers
  • Celebration with drinks and music

The DeepaMehta lounge is OPEN: everybody can attend, everybody can contribute. Please check the Wiki page for details. There you can also add your own presentation or ideas.

Mar 11, 2013
DeepaMehta 4.1 released

On Mar 11, 2013 DeepaMehta 4.1 has been released. This is the most important DM4 release as it comes with a Data Sustainability Guarantee. For the first time, data you enter in DM4 is guaranteed to be transferred to all future DM4 releases automatically. So, after more than 18 months of development, the DM4 experimental stage is now over. You can begin productive DM4-based projects now.

Besides that, DM 4.1 brings minor improvements in usability and functionality. Crucial access control related bugs and other bugs are fixed. The plugin framework simplifies development by providing a DB-attached CompositeValue object. For a complete list of changes in DM 4.1 and further details see the Release Notes.

Jan 30, 2013
DeepaMehta 4.0.14 released

Main focus of DeepaMehta 4.0.14 is better Performance, in particular when there is a lot of content in the database. All the changes are behind the scenes. The user will perceive nothing but performance. The original problem background is described in a mailing list posting.

The storage layer of DeepaMehta 4.0.14 is completely rewritten. It features High-speed traversal: a Lucene index for associations significantly speeds up traversal. In particular, highly connected nodes ("supernodes") have no negative impact on traversal speed anymore. Compact architecture: the storage implementation is coded directly to the DeepaMehta Model API. The additional MehtaGraph bridging layer is dropped. Modular storage layer: 3rd-party developers are enabled to implement alternate DeepaMehta storage layers, based on arbitrary databases. A Storage layer implementation is deployed as an OSGi service.

For more changes and details see the Release Notes.

Dec 24, 2012
DeepaMehta 4.0.13 released

DeepaMehta 4.0.13 uses a more efficient storage approach for access control information and returns to the Performance known from DeepaMehta 4.0.11 and before. Furthermore, Geomaps are a new topicmap type for displaying geo-related topics on an OpenStreetMap. A graphical Association Type Editor allows the user to create custom association types. And a whole bunch of GUI changes improves usability e.g. through Cluster Moves and more informed Topic Revelation.

Starting from version 4.0.13 DeepaMehta comes in 2 flavors: the known "Standard Distribution" which focuses on small download size and easy setup for single users and the new Karaf Distribution for client-server setups. The latter one is based on Apache Karaf and makes it easy to run DeepaMehta as a daemon process and to access it via a remote shell.

A lot more new features and improvements are described in the Release Notes.

Dec 04, 2012
3rd DeepaMehta Community Lounge

On Dec 4, 2012 we will be celebrating the 3rd DeepaMehta Community Lounge in Berlin. We will showcase the recent and upcoming DeepaMehta releases and various custom applications.

The agenda known so far:

  • DM4 short introduction (jri)
  • New features of DM 4.0.12 and upcoming 4.0.13 (jri)
  • Poemspace Mailer - A collaborative email campaigning tool (dgf)
  • Kiezatlas App - Geographic content management with a mobile client (mre)
  • Kiezatlas 2.0 - A rewrite of Kiezatlas 1.x with a facet data model (jri)
  • EduZEN - E-learning at Technische Universität Berlin (tsc)
  • Celebrate

The DeepaMehta lounge is OPEN: everybody can join, everybody can invite, everybody can contribute. Please check the Wiki page for details. There you can also add your acceptance or ideas.