I have just installed the latest Hudson for the first time. It is installed on
JBoss 4.2.1 under Unbuntu Feisty. I followed the install instructions, and the
Dashboard and Admin pages all come up fine.

Then I go to create my first project, which hooks into subversion.

At the svn part, I enter the URL, which is a ssh one something like this:
svn+ssh://myoffice.com/srv/svn/myoffice/trunk

Hudson tells me it can not authenticate, and suggests I enter credentials.

So I go and do that, entering the user and browsing to the private key. (I can
ssh to this box from the command-line without being prompted for a password, so
the ssh keys part works).

On submit, I get this exception:
HTTP Status 500 -

type Exception report

message

description The server encountered an internal error () that prevented it from
fulfilling this request.

exception

javax.servlet.ServletException: java.lang.NullPointerException
org.kohsuke.stapler.Stapler.invoke(Stapler.java:300)
org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:240)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:291)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:228)
org.kohsuke.stapler.Stapler.service(Stapler.java:76)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
hudson.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:79)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)

root cause

java.lang.NullPointerException
org.tmatesoft.svn.core.internal.io.svn.SVNGanymedConnector.close(SVNGanymedConnector.java:146)
org.tmatesoft.svn.core.internal.io.svn.SVNConnection.close(SVNConnection.java:204)
org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.closeSession(SVNRepositoryImpl.java:1082)
org.tmatesoft.svn.core.internal.io.svn.SVNRepositoryImpl.testConnection(SVNRepositoryImpl.java:71)
hudson.scm.SubversionSCM$DescriptorImpl.doPostCredential(SubversionSCM.java:982)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:103)
org.kohsuke.stapler.Function.bindAndinvoke(Function.java:59)
org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:63)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:291)
org.kohsuke.stapler.MetaClass$9.doDispatch(MetaClass.java:240)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:291)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:228)
org.kohsuke.stapler.Stapler.service(Stapler.java:76)
javax.servlet.http.HttpServlet.service(HttpServlet.java:803)
hudson.BasicAuthenticationFilter.doFilter(BasicAuthenticationFilter.java:79)
org.jboss.web.tomcat.filters.ReplyHeaderFilter.doFilter(ReplyHeaderFilter.java:96)