We recently updated our Jenkins server from an earlier version (maybe 1.514) using aptitude. After the upgrade, we now get an error when updating a job config. The stack trace is below. It appears to be throwing a MalformedURLException on "https://yougov.kilnhg.com/Code/Repositories/G/gryphon/".

I've upgraded the Mercurial plugin to the latest available (using the web interface), but the problem persists. I've also tried replacing the 'kiln://' scheme of the repository URL with a full 'https://' URL, but the problem persists.

javax.servlet.ServletException: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.mercurial.MercurialSCM from {"value":"2","source":"kiln://G/gryphon","credentialsId":"","branch":"default","modules":"","clean":false,"subdir":"","":"4","browser":{"stapler-class":"hudson.plugins.mercurial.browser.KilnHG","url":"https://yougov.kilnhg.com/Code/Repositories/G/gryphon/"}}
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:777)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:841)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:248)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:727)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:841)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:630)
at org.kohsuke.stapler.Stapler.service(Stapler.java:224)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:96)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:88)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:46)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
at org.eclipse.jetty.server.Server.handle(Server.java:370)
at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.mercurial.MercurialSCM from {"value":"2","source":"kiln://G/gryphon","credentialsId":"","branch":"default","modules":"","clean":false,"subdir":"","":"4","browser":{"stapler-class":"hudson.plugins.mercurial.browser.KilnHG","url":"https://yougov.kilnhg.com/Code/Repositories/G/gryphon/"}}
at hudson.model.Descriptor.newInstance(Descriptor.java:578)
at hudson.plugins.mercurial.MercurialSCM$DescriptorImpl.newInstance(MercurialSCM.java:770)
at hudson.plugins.mercurial.MercurialSCM$DescriptorImpl.newInstance(MercurialSCM.java:744)
at hudson.scm.SCMS.parseSCM(SCMS.java:63)
at hudson.model.AbstractProject.submit(AbstractProject.java:2002)
at hudson.model.Project.submit(Project.java:202)
at hudson.model.Job.doConfigSubmit(Job.java:1136)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:787)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:297)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:160)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:95)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:120)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:727)
... 46 more
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.mercurial.MercurialSCM from {"value":"2","source":"kiln://G/gryphon","credentialsId":"","branch":"default","modules":"","clean":false,"subdir":"","":"4","browser":{"stapler-class":"hudson.plugins.mercurial.browser.KilnHG","url":"https://yougov.kilnhg.com/Code/Repositories/G/gryphon/"}}
at hudson.model.Descriptor.newInstance(Descriptor.java:578)
at hudson.plugins.mercurial.MercurialSCM$DescriptorImpl.newInstance(MercurialSCM.java:770)
at hudson.plugins.mercurial.MercurialSCM$DescriptorImpl.newInstance(MercurialSCM.java:744)
at hudson.model.Descriptor$1.instantiate(Descriptor.java:1046)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:665)
at org.kohsuke.stapler.RequestImpl.access$100(RequestImpl.java:81)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:587)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:396)
at hudson.model.Descriptor.newInstance(Descriptor.java:569)
... 63 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.mercurial.MercurialSCM from {"value":"2","source":"kiln://G/gryphon","credentialsId":"","branch":"default","modules":"","clean":false,"subdir":"","":"4","browser":{"stapler-class":"hudson.plugins.mercurial.browser.KilnHG","url":"https://yougov.kilnhg.com/Code/Repositories/G/gryphon/"}}
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:589)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:396)
at hudson.model.Descriptor.newInstance(Descriptor.java:569)
... 72 more
Caused by: java.lang.IllegalArgumentException: Failed to convert the browser parameter of the constructor public hudson.plugins.mercurial.MercurialSCM(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,hudson.plugins.mercurial.browser.HgBrowser,boolean,java.lang.String)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:686)
at org.kohsuke.stapler.RequestImpl.access$100(RequestImpl.java:81)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:587)
... 75 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.mercurial.browser.HgBrowser from

{"stapler-class":"hudson.plugins.mercurial.browser.KilnHG","url":"https://yougov.kilnhg.com/Code/Repositories/G/gryphon/"}

at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:589)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:684)
... 77 more
Caused by: java.lang.IllegalArgumentException: java.net.MalformedURLException
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:462)
at org.kohsuke.stapler.RequestImpl.bindParameters(RequestImpl.java:392)
at org.kohsuke.stapler.RequestImpl.bindParameters(RequestImpl.java:363)
at hudson.plugins.mercurial.browser.KilnHG$DescriptorImpl.newInstance(KilnHG.java:72)
at hudson.plugins.mercurial.browser.KilnHG$DescriptorImpl.newInstance(KilnHG.java:65)
at hudson.model.Descriptor$1.instantiate(Descriptor.java:1046)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:665)
at org.kohsuke.stapler.RequestImpl.access$100(RequestImpl.java:81)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:587)
... 79 more
Caused by: java.net.MalformedURLException
at java.net.URL.<init>(URL.java:619)
at java.net.URL.<init>(URL.java:482)
at java.net.URL.<init>(URL.java:431)
at hudson.plugins.mercurial.browser.HgBrowser.<init>(HgBrowser.java:72)
at hudson.plugins.mercurial.browser.KilnHG.<init>(KilnHG.java:24)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:447)
... 87 more
Caused by: java.lang.NullPointerException