This same Jenkins installation is acting really weird -- sometimes the "Loading" overlay doesn't disappear, covering the configuration screen and preventing me from making changes. If I restart Jenkins, sometimes it works. It's been acting that way ever since I installed it yesterday. System is RedHat 6.1, 64-bit. JVM is OpenJDK 1.6.0_20-b20. Here are the installed plugins:
mailer 1.4 false false external-monitor-job 1.1 false false ldap 1.2 false true pam-auth 1.0 false false instant-messaging 1.25 true false jabber 1.25 true false ant 1.1 false false javadoc 1.0 false false saferestart 0.2 true false ssh-slaves 0.22 false false cvs 2.7 false true role-strategy 1.1.2 true false translation 1.10 false true subversion 1.45 true true active-directory 1.30 true false maven-plugin ERROR: Processing failed due to a bug in the code. Please report this to jenkinsci-users@googlegroups.com java.lang.NullPointerException <http://stacktrace.jenkins-ci.org/search?query=java.lang.NullPointerException> at hudson.tasks.MailSender.createEmptyMail(MailSender.java:312) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.createEmptyMail&entity=method> at hudson.tasks.MailSender.createUnstableMail(MailSender.java:188) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.createUnstableMail&entity=method> at hudson.tasks.MailSender.getMail(MailSender.java:159) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.getMail&entity=method> at hudson.tasks.MailSender.execute(MailSender.java:100) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.execute&entity=method> at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:55) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.reporters.MavenMailer.end&entity=method> at hudson.maven.AbstractMavenBuilder.end(AbstractMavenBuilder.java:103) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.AbstractMavenBuilder.end&entity=method> at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:758) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun&entity=method> at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:592) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.AbstractBuild$AbstractBuildExecution.run&entity=method> at hudson.model.Run.execute(Run.java:1543) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.Run.execute&entity=method> at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:477) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.MavenModuleSetBuild.run&entity=method> at hudson.model.ResourceController.execute(ResourceController.java:88) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.ResourceController.execute&entity=method> at hudson.model.Executor.run(Executor.java:236) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.Executor.run&entity=method> ...and later in the same log: FATAL: null java.lang.NullPointerException <http://stacktrace.jenkins-ci.org/search?query=java.lang.NullPointerException> at hudson.tasks.MailSender.createEmptyMail(MailSender.java:312) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.createEmptyMail&entity=method> at hudson.tasks.MailSender.createUnstableMail(MailSender.java:188) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.createUnstableMail&entity=method> at hudson.tasks.MailSender.getMail(MailSender.java:159) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.getMail&entity=method> at hudson.tasks.MailSender.execute(MailSender.java:100) <http://stacktrace.jenkins-ci.org/search/?query=hudson.tasks.MailSender.execute&entity=method> at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:55) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.reporters.MavenMailer.end&entity=method> at hudson.maven.AbstractMavenBuilder.end(AbstractMavenBuilder.java:103) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.AbstractMavenBuilder.end&entity=method> at hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun(MavenModuleSetBuild.java:758) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.MavenModuleSetBuild$MavenModuleSetBuildExecution.doRun&entity=method> at hudson.model.AbstractBuild$AbstractBuildExecution.run(AbstractBuild.java:592) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.AbstractBuild$AbstractBuildExecution.run&entity=method> at hudson.model.Run.execute(Run.java:1543) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.Run.execute&entity=method> at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:477) <http://stacktrace.jenkins-ci.org/search/?query=hudson.maven.MavenModuleSetBuild.run&entity=method> at hudson.model.ResourceController.execute(ResourceController.java:88) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.ResourceController.execute&entity=method> at hudson.model.Executor.run(Executor.java:236) <http://stacktrace.jenkins-ci.org/search/?query=hudson.model.Executor.run&entity=method>
