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Bug
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Resolution: Not A Defect
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Blocker
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jenkins 2.176.4, centos6, JDK11
After upgrading to JDK11, the plugin fails with:
09:38:39 - ERROR: Step ‘E-mail Notification’ aborted due to exception: 09:38:39 - ERROR: Step ‘E-mail Notification’ aborted due to exception: 09:38:39 - java.lang.ClassNotFoundException: javax.activation.DataSource 09:38:39 - at java.base/java.net.URLClassLoader.findClass(URLClassLoader.java:471) 09:38:39 - at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:588) 09:38:39 - at java.base/java.lang.ClassLoader.loadClass(ClassLoader.java:521) 09:38:39 - Caused: java.lang.NoClassDefFoundError: javax/activation/DataSource 09:38:39 - at jenkins.plugins.mailer.tasks.MimeMessageBuilder.buildMimeMessage(MimeMessageBuilder.java:198) 09:38:39 - at hudson.tasks.MailSender.createEmptyMail(MailSender.java:403) 09:38:39 - at hudson.tasks.MailSender.createBackToNormalMail(MailSender.java:208) 09:38:39 - at hudson.tasks.MailSender.createMail(MailSender.java:196) 09:38:39 - at hudson.tasks.MailSender.run(MailSender.java:111) 09:38:39 - at hudson.tasks.Mailer.perform(Mailer.java:175) 09:38:39 - at hudson.tasks.Mailer.perform(Mailer.java:138) 09:38:39 - at hudson.tasks.BuildStepMonitor$1.perform(BuildStepMonitor.java:20) 09:38:39 - at hudson.model.AbstractBuild$AbstractBuildExecution.perform(AbstractBuild.java:741) 09:38:39 - at hudson.model.AbstractBuild$AbstractBuildExecution.performAllBuildSteps(AbstractBuild.java:690) 09:38:39 - at hudson.model.Build$BuildExecution.post2(Build.java:186) 09:38:39 - at hudson.model.AbstractBuild$AbstractBuildExecution.post(AbstractBuild.java:635) 09:38:39 - at hudson.model.Run.execute(Run.java:1843) 09:38:39 - at hudson.model.FreeStyleBuild.run(FreeStyleBuild.java:43) 09:38:39 - at hudson.model.ResourceController.execute(ResourceController.java:97) 09:38:39 - at hudson.model.Executor.run(Executor.java:429)
[JENKINS-59595] plugin failing with JDK11
Peter River
added a comment - mailer-plugin 1.28
Jetty 9.3.15 Maybe... https://www.eclipse.org/jetty/documentation/9.4.x/startup-classpath.html
System classes such as {{java.lang.String}} are excluded from the webapp priority, and you may not replace them with classes in {{WEB-INF/lib}} or {{WEB-INF/}} classes. Unfortunately the specification does not clearly state what classes are _System_ classes, and it is unclear if all {{javax}} classes should be treated as System classes.
Jetty provides a javax.annotation class, but not the javax.activation.
Peter River
added a comment - - edited Maybe... https://www.eclipse.org/jetty/documentation/9.4.x/startup-classpath.html
System classes such as {{java.lang. String }} are excluded from the webapp priority, and you may not replace them with classes in {{WEB-INF/lib}} or {{WEB-INF/}} classes. Unfortunately the specification does not clearly state what classes are _System_ classes, and it is unclear if all {{javax}} classes should be treated as System classes.
Jetty provides a javax.annotation class, but not the javax.activation. "fixed"
download jar https://mvnrepository.com/artifact/com.sun.activation/javax.activation/1.2.0 into
{jetty.home}/lib/ext
and start jetty with the option --module=ext
Peter River
added a comment - - edited "fixed"
download jar https://mvnrepository.com/artifact/com.sun.activation/javax.activation/1.2.0 into
{jetty.home}/lib/ext
and start jetty with the option --module=ext 
Hi peterriver, thanks for reporting the problem. Could you please tell me which version of the Mailer plugin you have on your instance? (If you have the support-core plugin installed, it would be easier to get a "support bundle" of your instance).
I'm surprise that the tests are not catching this.