I've upgraded from gradle 0.8 to 0.9-rc1 and something must have changed in the way a new JVM is forked because as soon as I add a JUnit or TestNG class I get an exception.
This seems to be a problem with my environment (Gentoo Linux) since it works fine in windows, but it worked on both platforms in 0.8.
I tried to debug the problem but it happens in the initialization of the forked VM (setting up logging) before even running any test.

I feel this has something to do with my setup, but I'm a little stuck in debugging it and I didn't receive any response in the mailing list.

The exception trace is:
java.lang.NoClassDefFoundError: org/apache/commons/lang/StringUtils
at org.gradle.logging.AnsiConsole$LabelImpl.draw(AnsiConsole.java:178)
at org.gradle.logging.AnsiConsole$1.execute(AnsiConsole.java:51)
at org.gradle.logging.AnsiConsole$1.execute(AnsiConsole.java:48)
at org.gradle.logging.AnsiConsole.render(AnsiConsole.java:65)
at org.gradle.logging.AnsiConsole.addStatusBar(AnsiConsole.java:48)
at org.gradle.logging.ConsoleBackedFormatter.<init>(ConsoleBackedFormatter.java:33)
at org.gradle.logging.Slf4jLoggingConfigurer.configure(Slf4jLoggingConfigurer.java:100)
at org.gradle.logging.DefaultLoggingConfigurer.configure(DefaultLoggingConfigurer.java:34)
at org.gradle.logging.LoggingSystemAdapter.setLevel(LoggingSystemAdapter.java:55)
at org.gradle.logging.LoggingSystemAdapter.on(LoggingSystemAdapter.java:42)
at org.gradle.logging.DefaultLoggingManager$StartableLoggingSystem.start(DefaultLoggingManager.java:154)
at org.gradle.logging.DefaultLoggingManager.start(DefaultLoggingManager.java:56)
at org.gradle.logging.DefaultLoggingManager.start(DefaultLoggingManager.java:31)
at org.gradle.process.internal.child.ImplementationClassLoaderWorker.execute(ImplementationClassLoaderWorker.java:53)
at org.gradle.process.internal.child.ImplementationClassLoaderWorker.execute(ImplementationClassLoaderWorker.java:36)
at org.gradle.process.internal.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:56)
at org.gradle.process.internal.child.SystemApplicationClassLoaderWorker.call(SystemApplicationClassLoaderWorker.java:38)
at org.gradle.process.internal.launcher.BootstrapClassLoaderWorker.call(BootstrapClassLoaderWorker.java:52)
at org.gradle.process.internal.launcher.BootstrapClassLoaderWorker.call(BootstrapClassLoaderWorker.java:33)
at org.gradle.process.internal.launcher.GradleWorkerMain.run(GradleWorkerMain.java:30)
at org.gradle.process.internal.launcher.GradleWorkerMain.main(GradleWorkerMain.java:35)