Reverting to Jenkins 1.473 while keeping the plugin to 1.0 works.

Thanks for the report! As I understand Jenkins philosophy, this is a core bug, as a Jenkins upgrade shouldn't break existing plugins. Reverting to 1.473 seems good for now, please raise this in #jenkins IRC if you can and see what kohsuke/anyone says, and let me know.

Is there any update if this is a core problem or if it needs fixing in the plugin?
I use Jenkins from the Linux package management and I can't simply install an older version like 1.473

P.S.
If there's a way to fix this in the plugin itself, should it not be done in any case?

It seems no one raised this in #jenkins, so I will try to get a response.

Lothar, for multiple reasons, including the issue you just encountered, I wouldn't recommend adding the Jenkins apt/yum/etc repository for a production server. The ability to roll back is crucial in the case of a Jenkins version which breaks some feature you rely on or has other bugs; you don't want this out of your control. Plus, surprise upgrades or new server spinups getting different versions is often problematic. I'd recommend either having your own repo where you can control the version, or simply use the specific version of the deb/rpm you need. See for example the second example at https://wiki.jenkins-ci.org/display/JENKINS/Puppet.

Can anyone experiencing this bug let me know if there are any Javascript errors in the browser console when this issue occurs? That will help me track it down. Thanks!

I checked in Chrome and there were no JS errors. I even stepped through the code, but there was nothing obvious.

FYI however you installed Jenkins all you need to do is download the Jenkins WAR file and drop that into your install directory (http://mirrors.jenkins-ci.org/war/1.473/) + restart.

Same issue for me: when I click add nothing happens and no script errors on FF12 and IE9, but when I click save I get a 500 and the following stack trace:
Status Code: 500
Exception: java.lang.RuntimeException: Failed to instantiate class htmlpublisher.HtmlPublisher from

Stacktrace:
javax.servlet.ServletException: java.lang.RuntimeException: Failed to instantiate class htmlpublisher.HtmlPublisher from

at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:616)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:488)
at org.kohsuke.stapler.Stapler.service(Stapler.java:162)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:248)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
at hudson.plugins.greenballs.GreenBallFilter.doFilter(GreenBallFilter.java:58)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:98)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:215)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:138)
at java.util.concurrent.Executors$RunnableAdapter.call(Unknown Source)
at java.util.concurrent.FutureTask$Sync.innerRun(Unknown Source)
at java.util.concurrent.FutureTask.run(Unknown Source)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Failed to instantiate class htmlpublisher.HtmlPublisher from

at hudson.model.Descriptor.newInstance(Descriptor.java:575)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:912)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:899)
at hudson.util.DescribableList.rebuildHetero(DescribableList.java:203)
at hudson.model.Project.submit(Project.java:203)
at hudson.model.Job.doConfigSubmit(Job.java:990)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:688)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(Unknown Source)
at java.lang.reflect.Method.invoke(Unknown Source)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
... 41 more
Caused by: java.lang.NullPointerException
at java.util.ArrayList.<init>(Unknown Source)
at htmlpublisher.HtmlPublisher.<init>(HtmlPublisher.java:60)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(Unknown Source)
at java.lang.reflect.Constructor.newInstance(Unknown Source)
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:424)
at org.kohsuke.stapler.RequestImpl.access$300(RequestImpl.java:76)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:631)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:377)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:373)
at hudson.model.Descriptor.newInstance(Descriptor.java:566)
... 57 more

Rolling back to 1.473 via WAR swap cured it.