After upgrading from 7.1.7 to 7.4.27 (unsure if the upgrade is related) the following exception occurs on server launch:

java.lang.IllegalArgumentException: Servlet Spec 12.2 violation: path spec must start with "/" or "*.": bad spec "\robots.txt"
	at org.eclipse.jetty.http.pathmap.ServletPathSpec.assertValidServletPathSpec(ServletPathSpec.java:175)
	at org.eclipse.jetty.http.pathmap.ServletPathSpec.<init>(ServletPathSpec.java:56)
	at org.eclipse.jetty.servlet.ServletHandler.updateMappings(ServletHandler.java:1424)
	at org.eclipse.jetty.servlet.ServletHandler.doStart(ServletHandler.java:164)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
	at org.eclipse.jetty.server.handler.ScopedHandler.doStart(ScopedHandler.java:120)
	at org.eclipse.jetty.server.session.SessionHandler.doStart(SessionHandler.java:505)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
	at org.eclipse.jetty.server.handler.ScopedHandler.doStart(ScopedHandler.java:120)
	at org.eclipse.jetty.server.handler.ContextHandler.startContext(ContextHandler.java:969)
	at org.eclipse.jetty.servlet.ServletContextHandler.startContext(ServletContextHandler.java:375)
	at org.eclipse.jetty.server.handler.ContextHandler.doStart(ContextHandler.java:910)
	at org.eclipse.jetty.servlet.ServletContextHandler.doStart(ServletContextHandler.java:288)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
	at org.eclipse.jetty.server.handler.gzip.GzipHandler.doStart(GzipHandler.java:426)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.start(ContainerLifeCycle.java:169)
	at org.eclipse.jetty.server.Server.start(Server.java:423)
	at org.eclipse.jetty.util.component.ContainerLifeCycle.doStart(ContainerLifeCycle.java:110)
	at org.eclipse.jetty.server.handler.AbstractHandler.doStart(AbstractHandler.java:97)
	at org.eclipse.jetty.server.Server.doStart(Server.java:387)
	at org.eclipse.jetty.util.component.AbstractLifeCycle.start(AbstractLifeCycle.java:73)
	at io.onedev.server.util.jetty.DefaultJettyLauncher.start(DefaultJettyLauncher.java:107)
	at io.onedev.server.OneDev.start(OneDev.java:108)
	at io.onedev.commons.loader.DefaultPluginManager.start(DefaultPluginManager.java:44)
	at io.onedev.commons.loader.AppLoader.start(AppLoader.java:73)
	at io.onedev.commons.bootstrap.Bootstrap.main(Bootstrap.java:189)
	at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
	at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
	at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
	at java.lang.reflect.Method.invoke(Unknown Source)
	at org.tanukisoftware.wrapper.WrapperSimpleApp.run(WrapperSimpleApp.java:349)
	at java.lang.Thread.run(Unknown Source)
<-- Wrapper Stopped

Seems to becaused by some kind of windows path issue