When a JobDSL job is created using the rvm plugin, it will use the Jenkins::Plugin::Proxies::BuildWrapper ruby class instead of Jenkins::Tasks::BuildWrapperProxy . This is part of an old compatibility fix in job-dsl-core/src/main/groovy/javaposse/jobdsl/dsl/helpers/wrapper/WrapperContext.groovy line 112.

Examination of the ruby-runtime source code for the 0.12 release reveals that it uses the Jenkins::Tasks::BuildWrapperProxy class, like ruby-runtime 0.13 does.

I locally recompiled the job-dsl plugin with the class name hard set to Jenkins::Tasks::BuildWrapperProxy (no plugin check conditional) and verified that the XML generated is properly parsed by Jenkins.