When I try URLs like "file:///c:/kohsuke/My Projects/hudson/fosdem/sv", svnkit
dies with NPE like

Status Code: 500
Exception:
Stacktrace:

java.lang.StringIndexOutOfBoundsException: String index out of range: -3
at java.lang.String.substring(String.java:1768)
at org.tmatesoft.svn.core.internal.io.fs.FSFS.findRepositoryRoot(FSFS.java:886)
at
org.tmatesoft.svn.core.internal.io.fs.FSRepository.openRepositoryRoot(FSRepository.java:111)
at
org.tmatesoft.svn.core.internal.io.fs.FSRepository.openRepository(FSRepository.java:90)
at
org.tmatesoft.svn.core.internal.io.fs.FSRepository.testConnection(FSRepository.java:82)
at
hudson.scm.SubversionSCM$DescriptorImpl.checkRepositoryPath(SubversionSCM.java:1220)
at hudson.scm.SubversionSCM$DescriptorImpl$2.check(SubversionSCM.java:1158)
at hudson.util.FormFieldValidator.process(FormFieldValidator.java:54)
at
hudson.scm.SubversionSCM$DescriptorImpl.doSvnRemoteLocationCheck(SubversionSCM.java:1137)
at sun.reflect.GeneratedMethodAccessor54.invoke(Unknown Source)
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:585)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:103)
at org.kohsuke.stapler.Function.bindAndinvoke(Function.java:59)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:63)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:361)
at org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:240)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:361)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:298)
at org.kohsuke.stapler.Stapler.service(Stapler.java:98)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:249)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:335)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:378)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:88)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:244)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.lang.Thread.run(Thread.java:595)