My instance of jenkins appears unable to parse any shell build steps as valid JSON. Clearly, the desired character is present in the string.

This started occurring around 1.430 and is still present in 1.438; though it may be a specific problem with a plugin.

Failed to parse form data. Please report this problem as a bug
JSON={"":"\t","builder":"\"[

{\"targets\":\"build\",\"buildFile\":\"\",\"properties\":\"\",\"antOpts\":\"\",\"stapler-class\":\"hudson.tasks.Ant\",\"kind\":\"hudson.tasks.Ant\"}

,

{\"command\":\"f\",\"stapler-class\":\"hudson.tasks.Shell\",\"kind\":\"hudson.tasks.Shell\"}

]\"","description":"\t","disable":{},"hasCustomQuietPeriod":

{"quiet_period":"300"}

,"hudson-tasks-junit-JUnitResultArchiver":

{"keepLongStdio":false,"testResults":"tests/unit/build/logs/*-junit.xml"}

,"hudson-triggers-SCMTrigger":

{"scmpoll_spec":"0 */4 * * *"}

,"logrotate":

{"logrotate_artifact_days":"","logrotate_artifact_nums":"","logrotate_days":"7","logrotate_nums":""}

,"name":"ValEx-trunknz","properties":{"hudson-model-ParametersDefinitionProperty":{},"hudson-plugins-trac-TracProjectProperty":

{"tracWebsite":"http://trac.adl.vm/"}

,"stapler-class-bag":"true"},"scm":{"":"\"[\"3\", \"auto\"]\"","excludedCommitMessages":"","excludedRegions":"","excludedRevprop":"","excludedUsers":"","includedRegions":"","locations":

{"local":".","remote":"svn://svn.adl.vm/vx/trunk"}

,"value":"2","workspaceUpdater":

{"stapler-class":"hudson.scm.subversion.UpdateWithRevertUpdater"}

}}

net.sf.json.JSONException: A JSONArray text must start with '[' at character 1 of "[

{"targets":"build","buildFile":"","properties":"","antOpts":"","stapler-class":"hudson.tasks.Ant","kind":"hudson.tasks.Ant"}

,

{"command":"f","stapler-class":"hudson.tasks.Shell","kind":"hudson.tasks.Shell"}

]"
at net.sf.json.util.JSONTokener.syntaxError(JSONTokener.java:512)
at net.sf.json.JSONArray._fromJSONTokener(JSONArray.java:903)
at net.sf.json.JSONArray._fromString(JSONArray.java:983)
at net.sf.json.JSONArray.fromObject(JSONArray.java:141)
at net.sf.json.JSONArray.fromObject(JSONArray.java:120)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:863)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:853)
at hudson.util.DescribableList.rebuildHetero(DescribableList.java:185)
at hudson.model.Project.submit(Project.java:197)
at hudson.model.Job.doConfigSubmit(Job.java:966)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:643)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:282)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:149)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:88)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:104)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:561)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:646)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:234)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:561)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:646)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:477)
at org.kohsuke.stapler.Stapler.service(Stapler.java:159)
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:95)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
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.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 hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
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:636)