Did you remove all the triggers from the job?

Please update to Jenkins 1.612 and try again.

I have removed all the triggers and upgrade jenkins to 1.612 . but still no effect .

"project_triggers":{"stapler-class":"","$class":""}

is clearly wrong.

How can i overcome this ?

Its working now . I have removed and created a new trigger . Now its sending email after build. Thank you All !!!

I have clicked remove-trigger button and created a new trigger !!! ...

You shouldn't have to do that. Did you upgrade the plugin recently or was this on a fresh Jenkins install?

Obviously this is not “fixed”. The question is how to reproduce it from scratch. Daniel Beck says he did not manage it.

So far, the report is not specific enough to investigate further. Vigneshwaran Ravimurugan could you provide a detailed explanation what the job config looked like before you were editing it, and what changes you performed? If you could restore the old (presumably broken) config from backup, and test whether it happens again, that would be great.

I got this error if i try to add ExtendedEmailPublisher as PostJob.

Error while serving http://...
java.lang.reflect.InvocationTargetException
	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:298)
	at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
	at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
	at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
	at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
	at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
	at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
	at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
	at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
	at javax.servlet.http.HttpServlet.service(HttpServlet.java:848)
	at org.eclipse.jetty.servlet.ServletHolder.handle(ServletHolder.java:686)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1494)
	at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:123)
	at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:114)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	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 jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
	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 jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
	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$1.doFilter(ChainedServletFilter.java:87)
	at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
	at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:171)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1482)
	at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
	at org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilter(ServletHandler.java:1474)
	at org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHandler.java:499)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:137)
	at org.eclipse.jetty.security.SecurityHandler.handle(SecurityHandler.java:533)
	at org.eclipse.jetty.server.session.SessionHandler.doHandle(SessionHandler.java:231)
	at org.eclipse.jetty.server.handler.ContextHandler.doHandle(ContextHandler.java:1086)
	at org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHandler.java:428)
	at org.eclipse.jetty.server.session.SessionHandler.doScope(SessionHandler.java:193)
	at org.eclipse.jetty.server.handler.ContextHandler.doScope(ContextHandler.java:1020)
	at org.eclipse.jetty.server.handler.ScopedHandler.handle(ScopedHandler.java:135)
	at org.eclipse.jetty.server.handler.HandlerWrapper.handle(HandlerWrapper.java:116)
	at org.eclipse.jetty.server.Server.handle(Server.java:370)
	at org.eclipse.jetty.server.AbstractHttpConnection.handleRequest(AbstractHttpConnection.java:489)
	at org.eclipse.jetty.server.AbstractHttpConnection.content(AbstractHttpConnection.java:960)
	at org.eclipse.jetty.server.AbstractHttpConnection$RequestHandler.content(AbstractHttpConnection.java:1021)
	at org.eclipse.jetty.http.HttpParser.parseNext(HttpParser.java:865)
	at org.eclipse.jetty.http.HttpParser.parseAvailable(HttpParser.java:240)
	at org.eclipse.jetty.server.AsyncHttpConnection.handle(AsyncHttpConnection.java:82)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint.handle(SelectChannelEndPoint.java:668)
	at org.eclipse.jetty.io.nio.SelectChannelEndPoint$1.run(SelectChannelEndPoint.java:52)
	at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
	at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
	at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.emailext.ExtendedEmailPublisher from {"project_disabled":false,"project_recipient_list":"$DEFAULT_RECIPIENTS","project_replyto":"$DEFAULT_REPLYTO","project_content_type":"default","project_default_subject":"$DEFAULT_SUBJECT","project_default_content":"$DEFAULT_CONTENT","project_attachments":"","project_attach_buildlog":"0","project_presend_script":"$DEFAULT_PRESEND_SCRIPT","project_save_output":false,"project_triggers":{"stapler-class":"","$class":""},"stapler-class":"hudson.plugins.emailext.ExtendedEmailPublisher","$class":"hudson.plugins.emailext.ExtendedEmailPublisher"}
	at hudson.model.Descriptor.newInstance(Descriptor.java:579)
	at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:941)
	at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:903)
	at hudson.util.DescribableList.rebuildHetero(DescribableList.java:208)
	at hudson.model.Project.submit(Project.java:236)
	at hudson.model.Job.doConfigSubmit(Job.java:1206)
	at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:788)
	... 73 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.emailext.ExtendedEmailPublisher from {"project_disabled":false,"project_recipient_list":"$DEFAULT_RECIPIENTS","project_replyto":"$DEFAULT_REPLYTO","project_content_type":"default","project_default_subject":"$DEFAULT_SUBJECT","project_default_content":"$DEFAULT_CONTENT","project_attachments":"","project_attach_buildlog":"0","project_presend_script":"$DEFAULT_PRESEND_SCRIPT","project_save_output":false,"project_triggers":{"stapler-class":"","$class":""},"stapler-class":"hudson.plugins.emailext.ExtendedEmailPublisher","$class":"hudson.plugins.emailext.ExtendedEmailPublisher"}
	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:602)
	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:404)
	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
	at hudson.model.Descriptor.newInstance(Descriptor.java:570)
	... 79 more
Caused by: java.lang.IllegalArgumentException: Failed to convert the project_triggers parameter of the constructor public hudson.plugins.emailext.ExtendedEmailPublisher(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,int,java.lang.String,boolean,java.util.List,hudson.plugins.emailext.MatrixTriggerMode,boolean,java.util.List)
	at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:699)
	at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:81)
	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:600)
	... 82 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.emailext.plugins.EmailTrigger from {"stapler-class":"","$class":""}
	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:602)
	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:638)
	at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:404)
	at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:697)
	... 84 more
Caused by: java.lang.IllegalArgumentException: Class  is specified in JSON, but no such class found in classLoader hudson.PluginManager$UberClassLoader
	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:596)
	... 87 more
Caused by: java.lang.ClassNotFoundException: cached miss for 
	at hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1105)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:591)
	... 87 more

Kai, what version of Jenkins and what version of email-ext? Also, did you upgrade either recently?

The issue also occurs on Jenkins 1.612 + Plugin Version 2.40.1.
Steps to recreate:
1) Open a config of a project and add the email section to the post build options
2) Click save
--> Exception

javax.servlet.ServletException: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.emailext.ExtendedEmailPublisher from {"project_disabled":false,"project_recipient_list":"$DEFAULT_RECIPIENTS","project_replyto":"$DEFAULT_REPLYTO","project_content_type":"default","project_default_subject":"$DEFAULT_SUBJECT","project_default_content":"$DEFAULT_CONTENT","project_attachments":"","project_attach_buildlog":"0","project_presend_script":"$DEFAULT_PRESEND_SCRIPT","project_save_output":false,"project_triggers":

,"stapler-class":"hudson.plugins.emailext.ExtendedEmailPublisher","$class":"hudson.plugins.emailext.ExtendedEmailPublisher"}
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:796)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:249)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:876)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:649)
at org.kohsuke.stapler.Stapler.service(Stapler.java:238)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:731)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:303)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:52)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:123)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:114)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:48)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
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 jenkins.security.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:117)
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 jenkins.security.BasicHeaderProcessor.doFilter(BasicHeaderProcessor.java:93)
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:171)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:49)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.kohsuke.stapler.DiagnosticThreadNameFilter.doFilter(DiagnosticThreadNameFilter.java:30)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:241)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:208)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:220)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:122)
at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:614)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:170)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:103)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:950)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:116)
at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:423)
at org.apache.coyote.http11.AbstractHttp11Processor.process(AbstractHttp11Processor.java:1079)
at org.apache.coyote.AbstractProtocol$AbstractConnectionHandler.process(AbstractProtocol.java:620)
at org.apache.tomcat.util.net.JIoEndpoint$SocketProcessor.run(JIoEndpoint.java:318)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1157)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:627)
at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
at java.lang.Thread.run(Thread.java:801)
Caused by: java.lang.RuntimeException: Failed to instantiate class hudson.plugins.emailext.ExtendedEmailPublisher from {"project_disabled":false,"project_recipient_list":"$DEFAULT_RECIPIENTS","project_replyto":"$DEFAULT_REPLYTO","project_content_type":"default","project_default_subject":"$DEFAULT_SUBJECT","project_default_content":"$DEFAULT_CONTENT","project_attachments":"","project_attach_buildlog":"0","project_presend_script":"$DEFAULT_PRESEND_SCRIPT","project_save_output":false,"project_triggers":

,"stapler-class":"hudson.plugins.emailext.ExtendedEmailPublisher","$class":"hudson.plugins.emailext.ExtendedEmailPublisher"}
at hudson.model.Descriptor.newInstance(Descriptor.java:579)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:941)
at hudson.model.Descriptor.newInstancesFromHeteroList(Descriptor.java:903)
at hudson.util.DescribableList.rebuildHetero(DescribableList.java:208)
at hudson.model.Project.submit(Project.java:236)
at hudson.model.Job.doConfigSubmit(Job.java:1206)
at hudson.model.AbstractProject.doConfigSubmit(AbstractProject.java:788)
at sun.reflect.GeneratedMethodAccessor1028.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:56)
at java.lang.reflect.Method.invoke(Method.java:620)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:298)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:161)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:96)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:121)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:746)
... 64 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.emailext.ExtendedEmailPublisher from {"project_disabled":false,"project_recipient_list":"$DEFAULT_RECIPIENTS","project_replyto":"$DEFAULT_REPLYTO","project_content_type":"default","project_default_subject":"$DEFAULT_SUBJECT","project_default_content":"$DEFAULT_CONTENT","project_attachments":"","project_attach_buildlog":"0","project_presend_script":"$DEFAULT_PRESEND_SCRIPT","project_save_output":false,"project_triggers":

,"stapler-class":"hudson.plugins.emailext.ExtendedEmailPublisher","$class":"hudson.plugins.emailext.ExtendedEmailPublisher"}
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:602)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:404)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:400)
at hudson.model.Descriptor.newInstance(Descriptor.java:570)
... 79 more
Caused by: java.lang.IllegalArgumentException: Failed to convert the project_triggers parameter of the constructor public hudson.plugins.emailext.ExtendedEmailPublisher(java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,java.lang.String,int,java.lang.String,boolean,java.util.List,hudson.plugins.emailext.MatrixTriggerMode,boolean,java.util.List)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:699)
at org.kohsuke.stapler.RequestImpl.access$200(RequestImpl.java:81)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:600)
... 82 more
Caused by: java.lang.IllegalArgumentException: Failed to instantiate class hudson.plugins.emailext.plugins.EmailTrigger from

at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:602)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:638)
at org.kohsuke.stapler.RequestImpl.bindJSON(RequestImpl.java:404)
at org.kohsuke.stapler.RequestImpl.instantiate(RequestImpl.java:697)
... 84 more
Caused by: java.lang.IllegalArgumentException: Class is specified in JSON, but no such class found in classLoader hudson.PluginManager$UberClassLoader
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:596)
... 87 more
Caused by: java.lang.ClassNotFoundException: cached miss for
at hudson.PluginManager$UberClassLoader.findClass(PluginManager.java:1105)
at java.lang.ClassLoader.loadClassHelper(ClassLoader.java:772)
at java.lang.ClassLoader.loadClass(ClassLoader.java:749)
at java.lang.ClassLoader.loadClass(ClassLoader.java:726)
at org.kohsuke.stapler.RequestImpl$TypePair.convertJSON(RequestImpl.java:591)
... 87 more

I don't get this exception. I ran Jenkins 1.612 + Email-ext 2.40.1 and I don't get this exception when I add email-ext to the post-build steps. So, something else is at play.

Additonal system information: SUSE Linux Enterprise Server 11 x86_64 GNU/Linux with Jenkins on Tomcat 7.
Which more system information do you need?

Job type and installed plugins may help.

Are you able to reproduce this issue on a newly set up instance e.g. on your desktop machine? java -jar jenkins.war and installing the plugin is a 5 minute job

Job Type: Freestyle
Installed Plugins:
analysis-collector 1.43
analysis-core 1.71
ant 1.2
antisamy-markup-formatter 1.3
artifactdeployer 0.33
artifactory 2.3.0
build-name-setter 1.3
build-pipeline-plugin 1.4.7
buildresult-trigger 0.17
checkstyle 3.42
copyartifact 1.35
credentials 1.22
cvs 2.12
dashboard-view 2.9.4
dependencyanalyzer 0.7
deploy 1.10
discard-old-build 1.05
email-ext 2.40.1
email-ext-recipients-column 1.0
external-monitor-job 1.4
git 2.3.5
git-client 1.17.0
html-audio-notifier 0.4
html5-notifier-plugin 1.5
htmlpublisher 1.3
http_request 1.8.8
ibm-ucdeploy-publisher 1.2.0
javadoc 1.3
jquery 1.11.2-0
jshint-checkstyle 3.36
jslint-checkstyle 3.35
junit 1.6
ldap 1.11
ldapemail 0.8
m2release 0.14.0
mailer 1.15
mapdb-api 1.0.6.0
matrix-auth 1.2
matrix-project 1.4.1
maven-info 0.2.0
maven-invoker-plugin 1.2
maven-metadata-plugin 1.2.0
maven-plugin 2.9
maven-repo-cleaner 1.2
pam-auth 1.2
parameterized-trigger 2.26
postbuild-task 1.8
progress-bar-column-plugin 1.0
repository 1.2
sametime 0.4
scm-api 0.2
scp 1.8
script-security 1.14
scripttrigger 0.31
ssh 2.4
ssh-credentials 1.11
ssh-slaves 1.9
subversion 2.5
teamconcert 1.1.9.1
token-macro 1.10
translation 1.12
versionnumber 1.5
windows-slaves 1.0

Can you post the config.xml for your job? Scrub any username/passwords first.

config.xml attached.

I've been trying to reproduce this and I just can't. Did you restart Jenkins after upgrading email-ext?

I'm having the same issue with Jenkins 1.612 and Email-ext 2.40.1. All I did was to add a post build step of editable email notification and just save it with the defaults.

Can you add the list of plugins you have installed? Also, is this a new install of Jenkins or did you upgrade, and if so, from what versions of Jenkins and email-ext?

I've got the same issue with Jenkins 1.612 and 2.40.1 of this plugin. The workaround is to:

• go into advanced settings within the email configuration
• remove the blank trigger that appears there

Before you do that, can you save off the HTML of the page? Or take a screenshot or something?

<tr style="opacity: 1;"><td class="setting-leftspace">&nbsp;</td><td class="setting-name">Triggers</td><td class="setting-main"><div class="hetero-list-container with-drag-drop  "><div class="repeated-chunk" name="project_triggers" id="yui-gen138"><table style="width:100%"><tbody><tr><td colspan="3"><div class="dd-handle" id="yui-gen139"><b></b></div></td><td class="setting-no-help"></td></tr><tr style="display:none"><td><input type="hidden" name="stapler-class"><input type="hidden" name="$class"></td></tr><tr><td colspan="4"><div align="right"><span class="yui-button yui-push-button repeatable-delete danger" id="yui-gen144"><span class="first-child"><button type="button" tabindex="0" id="yui-gen144-button">Remove Trigger</button></span></span></div></td></tr></tbody></table></div><div class="repeatable-insertion-point"></div><div><span class="yui-button yui-menu-button" id="yui-gen140"><span class="first-child"><button type="button" tabindex="0" id="yui-gen140-button" class="hetero-list-add" suffix="project_triggers">Add Trigger</button></span></span></div></div></td><td class="setting-help"><a helpurl="/plugin/email-ext/help/projectConfig/addATrigger.html" href="#" class="help-button" tabindex="9999"><img src="/static/32547464/images/16x16/help.png" class="icon-help icon-sm" alt="Help for feature: Triggers" style="width: 16px; height: 16px; "></a></td></tr>

That's the block of html with the empty trigger which is created by default when you add a new "Editable Email Notification". The problem seems to happen for me on Firefox 38 (haven't tested others) and it doesn't matter if you add the action to the release phase or the post-build phase.

If you try to save without expanding the "advanced" section and removing the blank trigger, then you get an error.

What is the "Release" phase you are talking about?

The release plugin is a common way to structure release builds. I also downgraded your plugin to 2.40 and it didn't help.

Can you post the contents of the plugin configuration file? It should be in JENKIN_HOME and it should have the name of the plugin in the filename. Its an XML file.

Yes, it has

<defaultTriggers>
<hudson.plugins.emailext.plugins.trigger.FailureTrigger_-DescriptorImpl>
<replacesList/>
<defaultRecipientProviders>
<hudson.plugins.emailext.plugins.recipients.DevelopersRecipientProvider/>
</defaultRecipientProviders>
</hudson.plugins.emailext.plugins.trigger.FailureTrigger_-DescriptorImpl>
</defaultTriggers>

But in the plugin configuration, none of the checkboxes are ticked in the list of "default triggers"

If you restart Jenkins, do you see any errors in the Jenkins logs about xstream or anything? Any exceptions that mention email-ext?

Nothing I can see.

What OS are you running on? What version of Jenkins?

1. uname -a
   FreeBSD delish.ish.com.au 10.1-RELEASE-p9 FreeBSD 10.1-RELEASE-p9 #0: Tue Apr 7 01:09:46 UTC 2015 root@amd64-builder.daemonology.net:/usr/obj/usr/src/sys/GENERIC amd64

Jenkins 1.612.

I think a previous poster reported it in Linux though. I'm not the original poster... I just found this thread when I hit the same problem. For all I know this issue has been happening for a long time, since I don't often add new email messages to existing jobs. I have no clear idea when it might have started happening.

Are you using Oracle Java, or another Java implementation? I'm trying to figure out why the defaultTriggers is not getting serialized correctly, or why a comparison is not happening correctly.

1. java -version
   openjdk version "1.7.0_80"
   OpenJDK Runtime Environment (build 1.7.0_80-b15)
   OpenJDK 64-Bit Server VM (build 24.80-b11, mixed mode)

Ok, I finally recreated this. I am looking in to how to fix it.

Alex Earl if it is indeed a core regression, it is probably my fault, so if you know how to reproduce feel free to assign to me—I was expecting to have to dig into it anyway.

I don't think it is a core regression, I think its the change I made for default triggers. Currently, it is serializing the descriptor information for what triggers to setup as default for new jobs. When the descriptor is deserialized, it is missing some of the internal values (clazz is null for instance), which causes a problem elsewhere in my code. Is deserialization of descriptors supposed to work, or should I be just putting the descriptor.getId() out there and calling getDescriptor?

Ah, apparently unrelated to JENKINS-26781.

Code changed in jenkins
User: Alex Earl
Path:
src/main/java/hudson/plugins/emailext/EmailRecipientUtils.java
src/main/java/hudson/plugins/emailext/ExtendedEmailPublisherDescriptor.java
src/main/resources/hudson/plugins/emailext/ExtendedEmailPublisher/config.groovy
src/main/resources/hudson/plugins/emailext/ExtendedEmailPublisher/global.groovy
http://jenkins-ci.org/commit/email-ext-plugin/faac7b4b7da32c1c45748629631a76989628a3cb
Log:
Fix JENKINS-28212

Serialize the descriptor id's instead of the descriptors themselves.

Should be fixed in the next release, which I will do later today.

Thanks for your excellent and quick response on this.