Overview

Multiverse is a Java based Software Transactional Memory (STM) implementation that wants to realize the following goals:

Language independent: so it can be used without relying on instrumentation and therefore can easily be used with other languages that can run on the JVM like like Scala, Groovy or JRuby.
Framework: for different STM implementation. This makes it easy to experiment with new features or build a customized STM implementation.

For a more complete list check the mission statement.

News

1 May 2011: release of Multiverse 0.7. A complete redesign where the central clock is removed so better scalable, a lot of performance improvements, support for commute, ensure/privatize, atomic operations on references, isolation levels and pessimistic lock mode levels.
1 September 2010: release of Multiverse 0.6 a lot of minor improvements (performance & instrumentation) and support for propagation levels.
2 May 2010: release of Multiverse 0.5. Support for compiletime instrumentation (Multiverse jar is pre-instrumented), new integration api to make integration in non Java languages easier. TransactionalArrayList/TransactionalReferenceArray, a lot of performance and scalability improvements, timed blocking calls and a lot of other small improvements.
24 February 2010: release of Multiverse 0.4. Support for optional read tracking, writeskew prevention, deferred and compensating tasks, 2 phase commit, improved instrumentation and performance and lots of other goodies.
10 January 2010: moved from googlecode to Codehaus. They provide a lot of Java licenses like my favorite IDE IntelliJ IDEA and everything else you need like Git, Clover and Bamboo.
1 December 2009: Open Source license for Atlassian Clover. Although Cobertura does its job, it isn't as advanced as Clover.
19 December 2009: release of Multiverse 0.3.
1 November 2009: Open source licence for JProfiler 6. Great performance tuning tool while developing.