I have Authorize Plugin installed and I'm running the build as an admin user (without that it would just fail with ERROR: script not yet approved for use).

I'm trying to run a job-dsl step with files checked out from SCM.

It fails when trying to import another class defined in the same directory:

/var/lib/jenkins/jobs/CFS Pipeline Seed/workspace/avalonPipeline.groovy: 3: unable to resolve class JobBuilder
 @ line 3, column 1.
   import JobBuilder
   ^

There is a JobBuilder.groovy file in the workspace.

I was able to run the job only by disabling "Enable script security for Job DSL scripts" option in the global security settings.