Improving Works have released version 5.2 of their continuous test runner for Java; Infinitest.

Infinitest is available as a plugin for the Eclipse Java IDE and JetBrains IntelliJ IDEA. Infinitest performs an optimised set of unit tests whenever a developer makes a change to source code. It requires either IntelliJ 8 (or above) or Eclipse 3.4 (or above). It also requires JUnit 4 and Java 1.5 (or later).

An individual license is available for $29. A corporate license costs $149. Both licenses are available from Improving Works.