Doesn't work when even when using the template plugin to use git configuration from another project.

Exception: java.lang.ClassCastException: hudson.plugins.templateproject.ProxySCM cannot be cast to hudson.plugins.git.GitSCM
Stacktrace:
javax.servlet.ServletException: java.lang.ClassCastException: hudson.plugins.templateproject.ProxySCM cannot be cast to hudson.plugins.git.GitSCM
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:616)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
at org.kohsuke.stapler.MetaClass$6.doDispatch(MetaClass.java:241)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:659)
at org.kohsuke.stapler.Stapler.invoke(Stapler.java:488)
at org.kohsuke.stapler.Stapler.service(Stapler.java:162)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:45)
at winstone.ServletConfiguration.execute(ServletConfiguration.java:248)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:333)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:376)
at hudson.util.PluginServletFilter$1.doFilter(PluginServletFilter.java:95)
at hudson.util.PluginServletFilter.doFilter(PluginServletFilter.java:87)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.security.csrf.CrumbFilter.doFilter(CrumbFilter.java:47)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
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 org.acegisecurity.ui.ExceptionTranslationFilter.doFilter(ExceptionTranslationFilter.java:166)
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 org.acegisecurity.ui.basicauth.BasicProcessingFilter.doFilter(BasicProcessingFilter.java:173)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at jenkins.security.ApiTokenFilter.doFilter(ApiTokenFilter.java:63)
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:66)
at hudson.security.ChainedServletFilter$1.doFilter(ChainedServletFilter.java:87)
at hudson.security.ChainedServletFilter.doFilter(ChainedServletFilter.java:76)
at hudson.security.HudsonFilter.doFilter(HudsonFilter.java:164)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at org.kohsuke.stapler.compression.CompressionFilter.doFilter(CompressionFilter.java:50)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at hudson.util.CharacterEncodingFilter.doFilter(CharacterEncodingFilter.java:81)
at winstone.FilterConfiguration.execute(FilterConfiguration.java:194)
at winstone.RequestDispatcher.doFilter(RequestDispatcher.java:366)
at winstone.RequestDispatcher.forward(RequestDispatcher.java:331)
at winstone.RequestHandlerThread.processRequest(RequestHandlerThread.java:215)
at winstone.RequestHandlerThread.run(RequestHandlerThread.java:138)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at winstone.BoundedExecutorService$1.run(BoundedExecutorService.java:77)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.lang.ClassCastException: hudson.plugins.templateproject.ProxySCM cannot be cast to hudson.plugins.git.GitSCM
at hudson.plugins.git.GitPublisher$DescriptorImpl.doCheckRemote(GitPublisher.java:508)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:616)
at org.kohsuke.stapler.Function$InstanceFunction.invoke(Function.java:288)
at org.kohsuke.stapler.Function.bindAndInvoke(Function.java:151)
at org.kohsuke.stapler.Function.bindAndInvokeAndServeResponse(Function.java:90)
at org.kohsuke.stapler.MetaClass$1.doDispatch(MetaClass.java:111)
at org.kohsuke.stapler.NameBasedDispatcher.dispatch(NameBasedDispatcher.java:53)
at org.kohsuke.stapler.Stapler.tryInvoke(Stapler.java:574)
... 60 more

Patch for git-plugin

The problem is located in the git-plugin which does not handle MultiSCM in GitPublisher.

I created a patch.

The patch also has a new feature "update Tag". If activated in git publish tag it will delete an existing tag and set it to the current position.

Please integrate my patch in the next release of git-plugin

Issue still exists with Git Plugin 1.1.26 with Jenkins LTS 1.480.1

Any help with this? I tried applying the patch to the most recent version of git plugin but unfortunately it failed.

Hi Is there a chance that this bug will be fixed ?

I am also interested in a fix... But I assume, as it hasn't been fixed the past 3 years nothing will happen unfortunately! Bummer. Generally I took a quick look at the patch provided by Martin Hubert. The idea is to add a simple:

if(scm instanceof MultiSCM) {
   for(SCM multiScm : ((MultiSCM)scm).getConfiguredSCMs()) {
      if(multiScm instanceof GitSCM)
         oldPerform((GitSCM) multiScm, build, launcher, listener);
   ...
else if(scm instanceof GitSCM)
   return oldPerform((GitSCM) scm, build, launcher, listener);
else return false;

(stripping a little logic for "success" management) to the current perform method... It would be great if you could provide such a patch.

Potential fix would be similar to https://github.com/jenkinsci/multiple-scms-plugin/pull/9

So the problem is that we can't generically support each type of SCM wrapper, and I don't think the maintainer wants to put unnecessary dependency on plugins which aren't required to use Git..?

Is there a way to optionally add dependency without requiring they all be installed?

I was looking at extending something the other day, and the docs said you can a) add the plugin to the pom.xml and specify <optional>true</optional> on it, and b) use the optional=true modifier on the @Extension attribute if appropriate.

Ok. That would help. But what if I'm not adding an extention point, just trying to use a class, ie: I need to be able to check if the SCM is a multi-scm? I don't know if that is reasonably doable or not...

Suggest that you migrate to Pipeline plugin, which offers a supported way of checking out from multiple scms
https://wiki.jenkins-ci.org/display/JENKINS/Pipeline+Plugin

rodrigc, Is there any support for pushing in pipeline? I do not see that on https://jenkins.io/doc/pipeline/steps/ for git or workflow-scm-step. In case users are expected to run that from shell, I do not think this justify as closing reason since used could do that with freestyle as well (multiple SCMs + git push from shell). Consuming credentials from Jenkins is one problem I can see.