We have this issue in our Hudson environment, that since we created some projects that use the GIT SCM plugin, any jobs that are using Subversion now report this exception. Somehow the GIT plugin seems to interfere with the build jobs that use subversion, even though the subversion jobs have no reference to GIT in their configuration.

The problem happens when the Hudson job tries to extract e-mail information about SVN author: as there are different authors from both GIT and SVN in the overall Hudson jobs, it seems that all of them are assumed to come from SVN.

See below the exception:

java.lang.ClassCastException: hudson.plugins.git.GitSCM cannot be cast to hudson.scm.SubversionSCM
at hudson.scm.SubversionChangeLogSet$LogEntry.preparePath(SubversionChangeLogSet.java:175)
at hudson.scm.SubversionChangeLogSet$LogEntry.access$200(SubversionChangeLogSet.java:118)
at hudson.scm.SubversionChangeLogSet$LogEntry$1.get(SubversionChangeLogSet.java:166)
at hudson.scm.SubversionChangeLogSet$LogEntry$1.get(SubversionChangeLogSet.java:164)
at java.util.AbstractList$Itr.next(AbstractList.java:345)
at hudson.maven.MavenModuleSetBuild$1.isDescendantOf(MavenModuleSetBuild.java:200)
at hudson.maven.MavenModuleSetBuild$1.<init>(MavenModuleSetBuild.java:170)
at hudson.maven.MavenModuleSetBuild.getChangeSetFor(MavenModuleSetBuild.java:164)
at hudson.maven.FilteredChangeLogSet.<init>(FilteredChangeLogSet.java:52)
at hudson.maven.MavenBuild.getChangeSet(MavenBuild.java:159)
at hudson.model.AbstractBuild.hasParticipant(AbstractBuild.java:314)
at hudson.model.AbstractProject.hasParticipant(AbstractProject.java:1086)
at hudson.model.User.getProjects(User.java:369)
at hudson.tasks.MailAddressResolver$DefaultAddressResolver.findMailAddressFor(MailAddressResolver.java:148)
at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:86)
at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:476)
at hudson.tasks.MailSender.buildCulpritList(MailSender.java:344)
at hudson.tasks.MailSender.createEmptyMail(MailSender.java:325)
at hudson.tasks.MailSender.createUnstableMail(MailSender.java:167)
at hudson.tasks.MailSender.getMail(MailSender.java:138)
at hudson.tasks.MailSender.execute(MailSender.java:81)
at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:54)
at hudson.maven.MavenModuleSetBuild$Builder.end(MavenModuleSetBuild.java:679)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:483)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:383)
at hudson.model.Run.run(Run.java:1174)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:304)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:123)
project=hudson.maven.MavenModuleSet@18a0ac[Blueprint_2.0]
project.getModules()=[hudson.maven.MavenModule@127ac1f[Blueprint_2.0/com.vodafone.global.dcs:blueprint]]
project.getRootModule()=hudson.maven.MavenModule@127ac1f[Blueprint_2.0/com.vodafone.global.dcs:blueprint]
FATAL: hudson.plugins.git.GitSCM cannot be cast to hudson.scm.SubversionSCM
java.lang.ClassCastException: hudson.plugins.git.GitSCM cannot be cast to hudson.scm.SubversionSCM
at hudson.scm.SubversionChangeLogSet$LogEntry.preparePath(SubversionChangeLogSet.java:175)
at hudson.scm.SubversionChangeLogSet$LogEntry.access$200(SubversionChangeLogSet.java:118)
at hudson.scm.SubversionChangeLogSet$LogEntry$1.get(SubversionChangeLogSet.java:166)
at hudson.scm.SubversionChangeLogSet$LogEntry$1.get(SubversionChangeLogSet.java:164)
at java.util.AbstractList$Itr.next(AbstractList.java:345)
at hudson.maven.MavenModuleSetBuild$1.isDescendantOf(MavenModuleSetBuild.java:200)
at hudson.maven.MavenModuleSetBuild$1.<init>(MavenModuleSetBuild.java:170)
at hudson.maven.MavenModuleSetBuild.getChangeSetFor(MavenModuleSetBuild.java:164)
at hudson.maven.FilteredChangeLogSet.<init>(FilteredChangeLogSet.java:52)
at hudson.maven.MavenBuild.getChangeSet(MavenBuild.java:159)
at hudson.model.AbstractBuild.hasParticipant(AbstractBuild.java:314)
at hudson.model.AbstractProject.hasParticipant(AbstractProject.java:1086)
at hudson.model.User.getProjects(User.java:369)
at hudson.tasks.MailAddressResolver$DefaultAddressResolver.findMailAddressFor(MailAddressResolver.java:148)
at hudson.tasks.MailAddressResolver.resolve(MailAddressResolver.java:86)
at hudson.tasks.Mailer$UserProperty.getAddress(Mailer.java:476)
at hudson.tasks.MailSender.buildCulpritList(MailSender.java:344)
at hudson.tasks.MailSender.createEmptyMail(MailSender.java:325)
at hudson.tasks.MailSender.createUnstableMail(MailSender.java:167)
at hudson.tasks.MailSender.getMail(MailSender.java:138)
at hudson.tasks.MailSender.execute(MailSender.java:81)
at hudson.maven.reporters.MavenMailer.end(MavenMailer.java:54)
at hudson.maven.MavenModuleSetBuild$Builder.end(MavenModuleSetBuild.java:679)
at hudson.maven.MavenModuleSetBuild$RunnerImpl.doRun(MavenModuleSetBuild.java:483)
at hudson.model.AbstractBuild$AbstractRunner.run(AbstractBuild.java:383)
at hudson.model.Run.run(Run.java:1174)
at hudson.maven.MavenModuleSetBuild.run(MavenModuleSetBuild.java:304)
at hudson.model.ResourceController.execute(ResourceController.java:88)
at hudson.model.Executor.run(Executor.java:123)

Versions

   * Hudson: 1.346
   * Ubuntu 8.04 (linux kernel 2.6.24-19-generic), 32 bit, i686.
   * Java(TM) SE Runtime Environment (build 1.6.0_10-b33)
     Java HotSpot(TM) Client VM (build 11.0-b15, mixed mode)
   * Subversion Plugin 1.8
   * Hudson GIT plugin 0.8

As an addition info, we have a similar exception if we browse the list of people from Hudson:

exception

javax.servlet.ServletException: java.lang.ClassCastException: hudson.plugins.git.GitSCM cannot be cast to hudson.scm.SubversionSCM
org.kohsuke.stapler.Stapler.invoke(Stapler.java:554)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:435)
org.kohsuke.stapler.Stapler.service(Stapler.java:123)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
hudson.plugins.collabnet.auth.CNFilter.doFilter(CNFilter.java:72)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:97)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)

root cause

java.lang.ClassCastException: hudson.plugins.git.GitSCM cannot be cast to hudson.scm.SubversionSCM
hudson.scm.SubversionChangeLogSet$LogEntry.preparePath(SubversionChangeLogSet.java:175)
hudson.scm.SubversionChangeLogSet$LogEntry.access$200(SubversionChangeLogSet.java:118)
hudson.scm.SubversionChangeLogSet$LogEntry$1.get(SubversionChangeLogSet.java:166)
hudson.scm.SubversionChangeLogSet$LogEntry$1.get(SubversionChangeLogSet.java:164)
java.util.AbstractList$Itr.next(AbstractList.java:345)
hudson.maven.MavenModuleSetBuild$1.isDescendantOf(MavenModuleSetBuild.java:200)
hudson.maven.MavenModuleSetBuild$1.<init>(MavenModuleSetBuild.java:170)
hudson.maven.MavenModuleSetBuild.getChangeSetFor(MavenModuleSetBuild.java:164)
hudson.maven.FilteredChangeLogSet.<init>(FilteredChangeLogSet.java:52)
hudson.maven.MavenBuild.getChangeSet(MavenBuild.java:159)
hudson.model.View$People.getUserInfo(View.java:480)
hudson.model.View$People.<init>(View.java:458)
hudson.model.Hudson.getPeople(Hudson.java:769)
sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:39)
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:25)
java.lang.reflect.Method.invoke(Method.java:597)
org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:185)
org.kohsuke.stapler.MetaClass$4.doDispatch(MetaClass.java:144)
org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:30)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:519)
org.kohsuke.stapler.Stapler.invoke(Stapler.java:435)
org.kohsuke.stapler.Stapler.service(Stapler.java:123)
javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:94)
hudson.plugins.collabnet.auth.CNFilter.doFilter(CNFilter.java:72)
hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:97)
hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:86)
hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:84)
hudson.security.UnwrapSecurityExceptionFilter.doFilter(UnwrapSecurityExceptionFilter.java:51)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.providers.anonymous.AnonymousProcessingFilter.doFilter(AnonymousProcessingFilter.java:125)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.rememberme.RememberMeProcessingFilter.doFilter(RememberMeProcessingFilter.java:142)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.AbstractProcessingFilter.doFilter(AbstractProcessingFilter.java:271)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
org.acegisecurity.context.HttpSessionContextIntegrationFilter.doFilter(HttpSessionContextIntegrationFilter.java:249)
hudson.security.HttpSessionContextIntegrationFilter2.doFilter(HttpSessionContextIntegrationFilter2.java:66)
hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)