Super Dev Mode times out on launch

Hi. I have just installed GWT 2.7.0 with the Eclipse Luna plugin, all under jdk7, When I try Super Dev Mode, I get the URL briefly in the Eclipse console, but then it appears to timeout after about 1-2 seconds, before I can even paste it into Chrome. The relevant part of the error log is:

...

Compile completed in 8264 ms

2015-06-13 01:38:56.945:INFO::Logging to STDERR via org.mortbay.log.StdErrLog

2015-06-13 01:38:56.984:INFO::jetty-6.1.x

2015-06-13 01:38:56.999:WARN::failed org.mortbay.jetty.nio.SelectChannelConnector$1@40b0c5b8

java.lang.NoSuchMethodError: org.mortbay.thread.Timeout.<init>(Ljava/lang/Object;)V

at org.mortbay.io.nio.SelectorManager$SelectSet.<init>(SelectorManager.java:306)

at org.mortbay.io.nio.SelectorManager.doStart(SelectorManager.java:223)

...

I can't run GWT Classic Dev Mode because Chrome doesn't like the plugin anymore. I installed Firefox but the plugin isn't compatible with the latest version.

Any solution?

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