I was adding a war deployment step to a running job in Hudson and got the
following message.

Error

Failed to parse form data. Please report this probelm as a bug
JSON={"hudson-triggers-TimerTrigger":

{"timer_spec":"@daily"}

,"hudson-plugins-emotional_hudson-EmotionalHudsonPublisher":{},"jobProperty0":{},"jobProperty1":{"promotions":{"config":{"buildStep":{"":"hudson.plugins.deploy.Tomcat6xAdapter","adapter":

{"stapler-class":"hudson.plugins.deploy.Tomcat6xAdapter","userName":"","password":"","url":"http://phpdevapp3.dev.livenation.com:8080"}

,"kind":"hudson.plugins.deploy.DeployPublisher$DescriptorImpl","war":""},"name":""}}},"builder":[

{"shell":"env\necho \"Start svn up `date` \" \necho $WORKSPACE\nssh imager1 \"/usr/local/bin/svn up $WORKSPACE/global_digital\"\necho \"End svn up `date` \" \n# Fake out the properties file system to use hudson.properties to build the baker war into a private tomcat \n# so we can promote to being used later if the build works.\nexport USER=hudson\ncd $WORKSPACE/global_digital/plugins/baker/webapps/baker\nmkdir -p build/webapps\n$ANT_HOME/bin/ant -d -Duser.name=hudson clean\n$ANT_HOME/bin/ant -Duser.name=hudson\n","kind":"hudson.tasks.Shell$DescriptorImpl"}

,

{"shell":"cd $WORKSPACE/global_digital/plugins/baker/webapps/baker\n$ANT_HOME/bin/ant -Duser.name=hudson short-build","kind":"hudson.tasks.Shell$DescriptorImpl"}

],"hudson-plugins-deploy-DeployPublisher":{"":"hudson.plugins.deploy.Tomcat6xAdapter","adapter":

{"stapler-class":"hudson.plugins.deploy.Tomcat6xAdapter","userName":"","password":"","url":"http://phpdevapp3.dev.livenation.com:8080"}

,"war":"global_digital/plugins/baker/webapps/baker/build/webapps/baker.war"},"hudson-tasks-Mailer":

{"mailer_recipients":"sf-dev@internal.livenation.com","mailer_notifyEveryUnstableBuild":true,"mailer_sendToIndividuals":true}

,"hudson-tasks-ArtifactArchiver":

{"latestOnly":false,"excludes":"","artifacts":"global_digital/plugins/baker/webapps/baker/**/*.war"}

,"hudson-plugins-emailext-ExtendedEmailPublisher":

{"":["select","Failure"],"body":["$PROJECT_DEFAULT_CONTENT","$PROJECT_DEFAULT_CONTENT","$PROJECT_DEFAULT_CONTENT","$PROJECT_DEFAULT_CONTENT","$PROJECT_DEFAULT_CONTENT","$PROJECT_DEFAULT_CONTENT"],"project_default_subject":"$DEFAULT_SUBJECT","includeCulprits":[false,false,false,false,false,false],"configured":["true","false","false","false","false","false"],"subject":["$PROJECT_DEFAULT_SUBJECT","$PROJECT_DEFAULT_SUBJECT","$PROJECT_DEFAULT_SUBJECT","$PROJECT_DEFAULT_SUBJECT","$PROJECT_DEFAULT_SUBJECT","$PROJECT_DEFAULT_SUBJECT"],"project_default_content":"$DEFAULT_CONTENT","sendToDevelopers":[true,true,true,true,true,true],"sendToRecipientList":[true,true,false,false,true,false],"recipientlist_recipients":"stuartschmukler@livenation.com, corey.lohman@livenation.com, georgeblazer@livenation.com, tanyaGygi@livenation.com","recipientList":["","","","","",""]}

,"description":"","name":"daily-build","hudson-tasks-BuildTrigger":

{"childProjects":"the_bake, the_bake_in_place","evenIfUnstable":false}

,"jobProperty3":{},"scm":{"value":"0"}}

net.sf.json.JSONException: null object
at net.sf.json.JSONObject.verifyIsNull(JSONObject.java:2498)
at net.sf.json.JSONObject.getString(JSONObject.java:1842)
at hudson.plugins.promoted_builds.JobPropertyImpl.<init>(JobPropertyImpl.java:67)
at hudson.plugins.promoted_builds.JobPropertyImpl.<init>(JobPropertyImpl.java:37)
at
hudson.plugins.promoted_builds.JobPropertyImpl$DescriptorImpl.newInstance(JobPropertyImpl.java:229)
at
hudson.plugins.promoted_builds.JobPropertyImpl$DescriptorImpl.newInstance(JobPropertyImpl.java:213)
at hudson.model.Job.doConfigSubmit(Job.java:912)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:379)
at sun.reflect.GeneratedMethodAccessor527.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: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$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:84)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:155)
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:619)

Hudson ver. 1.291