Updating the pipeline-model-definition plugin to v1.2 not only beaks the running jobs, as advertised, but also all pipelines, as introduces a dependency with java 8. This java version is only required for jenkins v2.73, but for the plugin only v2.7 is needed.

I attach a simple pipeline that produces the error, and the error itself.

I see in the changelog some problems with compiling the plugin with the wrong java version, so I suspect this may be the same case.