1. Edit a job's configuration
2. Choose 'This build is parameterized'
3. Add a 'Choice' parameter, name it, but do not enter any choices
4. Save the configuration

You get a RuntimeException and stack trace. A more user-friendly error would be preferable. It took me a few minutes to realize my mistake. Full stack trace:

Exception: java.lang.RuntimeException: Failed to instantiate class hudson.model.ChoiceParameterDefinition from

{"name":"foo","choices":"","description":"","stapler-class":"hudson.model.ChoiceParameterDefinition","kind":"hudson.model.ChoiceParameterDefinition"}

Stacktrace:
javax.servlet.ServletException: java.lang.RuntimeException: Failed to instantiate class hudson.model.ChoiceParameterDefinition from

{"name":"foo","choices":"","description":"","stapler-class":"hudson.model.ChoiceParameterDefinition","kind":"hudson.model.ChoiceParameterDefinition"}

at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:719)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:770)
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:677)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:770)
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:677)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:770)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:583)
at org.kohsuke.stapler.Stapler.service(Stapler.java:214)
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:48)
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.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:124)
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:174)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:64)
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:67)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:227)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:150)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:441)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
at java.util.concurrent.FutureTask.run(FutureTask.java:138)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
at java.lang.Thread.run(Thread.java:662)
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.model.ChoiceParameterDefinition from

{"name":"foo","choices":"","description":"","stapler-class":"hudson.model.ChoiceParameterDefinition","kind":"hudson.model.ChoiceParameterDefinition"}

at hudson.model.Descriptor.newInstance(Descriptor.java:602)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:941)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:926)
at hudson.model.ParametersDefinitionProperty$DescriptorImpl.newInstance(ParametersDefinitionProperty.java:204)
at hudson.model.JobProperty.reconfigure(JobProperty.java:178)
at hudson.model.JobProperty.reconfigure(JobProperty.java:75)
at hudson.util.DescribableList.rebuild(DescribableList.java:171)
at hudson.model.Job.doConfigSubmit(Job.java:1052)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:758)
at sun.reflect.GeneratedMethodAccessor1280.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
at java.lang.reflect.Method.invoke(Method.java:597)
at org.kohsuke.stapler.Function$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:677)
... 62 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.model.ChoiceParameterDefinition from

{"name":"foo","choices":"","description":"","stapler-class":"hudson.model.ChoiceParameterDefinition","kind":"hudson.model.ChoiceParameterDefinition"}

at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:596)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:391)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:387)
at hudson.model.Descriptor.newInstance(Descriptor.java:593)
... 79 more
Caused by: java.lang.IllegalArgumentException: No choices found
at hudson.model.ChoiceParameterDefinition.<init>(ChoiceParameterDefinition.java:26)
at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:39)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:27)
at java.lang.reflect.Constructor.newInstance(Constructor.java:513)
at org.kohsuke.stapler.RequestImpl.invokeConstructor(RequestImpl.java:438)
at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:76)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:594)
... 82 more