I am using the build-on commit feature with github.

• I've got a dedicated user that has pull-only to several of my repositories.
• GitHub Web Hook is configured like so:
  + "Let Jenkins auto-manage hook URLs" enabled
  + "Override Hook URL" disabled
  + "GitHub credentials" = credentials of the dedicated user
• In the job configuration, "Build when a change is pushed to GitHub" is enabled
• On github.com in the "Service Hooks" section of my repo, I've added a "WebHook URL": https://XXX/github-webhook/

I've tested the hook (using "Test Hook" button in github Service Hooks configuration) in the following cases and here is what I observe:

• OK (= a build is triggered) if the repo contains a simple maven project at the root of the repository
• OK if the repo contains several (unrelated) maven projects and jenkins job root pom points to one of the projects
• NOT OK if the repo contains a multi-module maven project at the root of the repository and jenkins job root pom points to the 'master' pom, like so:
  <repo>/
  ..pom.xml <- root pom
  ..module1/
  ....src/
  ....pom.xml
  ..module2/
  ....src/
  ....pom.xml

thanks