After upgrading to version 1.331, we can no longer use Netbeans to connect to
our Hudson instance. hudson.out.log contains this exception:

[Winstone 2009/11/03 17:39:08] - Untrapped Error in Servlet
javax.servlet.ServletException:
org.kohsuke.stapler.export.NotExportableException: class hudson.scm.NullSCM
doesn't have @ExportedBean
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:505)
at org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:144)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:493)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:409)
at org.kohsuke.stapler.Stapler.service(Stapler.java:118)
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.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
at
org.jvnet.hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:38)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:97)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.plugins.audit_trail.AuditTrailFilter.doFilter(AuditTrailFilter.java:35)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
at
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
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(Unknown Source)
Caused by: org.kohsuke.stapler.export.NotExportableException: class
hudson.scm.NullSCM doesn't have @ExportedBean
at org.kohsuke.stapler.export.Model.<init>(Model.java:44)
at org.kohsuke.stapler.export.ModelBuilder.get(ModelBuilder.java:25)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:173)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:98)
at org.kohsuke.stapler.export.Property.writeTo(Property.java:82)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:142)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:139)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:139)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:180)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:143)
at org.kohsuke.stapler.export.Property.writeValue(Property.java:98)
at org.kohsuke.stapler.export.Property.writeTo(Property.java:82)
at org.kohsuke.stapler.export.Model.writeNestedObjectTo(Model.java:142)
at org.kohsuke.stapler.export.Model.writeTo(Model.java:133)
at hudson.model.Api.doXml(Api.java:94)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)

We are still able to connect to the Hudson instance via a browser.