Because of inconsistent version across pom files, jbosstools-server component doesn't build from branch jbosstools-4.2.0.Alpha1x. See https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/DevStudio/view/DevStudio_8.0.luna/job/jbosstools-server_42/3/console for more details. The error should be reproducible locally with

$ cd jbosstools-server/
$ git fetch jbosstools jbosstools-4.2.0.Alpha1x
$ git checkout FETCH_HEAD
# Clean local repo to make sure build doesn't rely on other unexpected stuff
$ rm -r ~/.m2/repository/org/jboss/tools/
$ mvn clean verify

As soon as you've fixed that, please trigger a new build from jenkins: https://jenkins.mw.lab.eng.bos.redhat.com/hudson/view/DevStudio/view/DevStudio_8.0.luna/job/jbosstools-server_42