The trend graph for Cobertura, normally visible on the job front page does not
show. When I click "View image" (in Firefox 3.1b2) I get:

Status Code: 500
Exception:
Stacktrace:

java.lang.NullPointerException
at
hudson.plugins.cobertura.CoberturaBuildAction.getPreviousResult(CoberturaBuildAction.java:140)
at
hudson.plugins.cobertura.CoberturaBuildAction.getPreviousResult(CoberturaBuildAction.java:125)
at
hudson.plugins.cobertura.CoberturaBuildAction.doGraph(CoberturaBuildAction.java:218)
at
hudson.plugins.cobertura.CoberturaProjectAction.doGraph(CoberturaProjectAction.java:91)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
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:156)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:76)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:73)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
at org.kohsuke.stapler.MetaClass$12.dispatch(MetaClass.java:313)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:181)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:438)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:356)
at org.kohsuke.stapler.Stapler.service(Stapler.java:116)
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:91)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:83)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:195)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:368)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:75)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:67)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:133)
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:613)

Generated by Winstone Servlet Engine v0.9.10 at Sat Feb 14 13:27:24 CET 2009

This is on Hudson 1.282, configured with just one job.

Here's some more system information:

$ uname -a
Darwin mac-mini-van-ernst-de-haan.local 9.6.0 Darwin Kernel Version 9.6.0: Mon
Nov 24 17:37:00 PST 2008; root:xnu-1228.9.59~1/RELEASE_I386 i386 i386

$ java -version
java version "1.5.0_16"
Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_16-b06-284)
Java HotSpot(TM) Client VM (build 1.5.0_16-133, mixed mode, sharing)

$ ant -version
Apache Ant version 1.7.1 compiled on June 27 2008

My browser agent string:
Mozilla/5.0 (Macintosh; U; Intel Mac OS X 10.5; en-US; rv:1.9.1b2)
Gecko/20081201 Firefox/3.1b2 RPT-HTTPClient/0.3-2

The job is configured using Subversion. I use current versions: JUnit 4.5 and
Cobertura 1.9.1.

If you need more information, let me know.