This happens because 'Native Node.js' configured by default without even testing it is present. It should ether test native node is installed and use it or use node from installed tern.node bundle.

Is my test flawed? What is otherwise the test to do for verifyin tern is running ?

Error when calling Tern code assist via command ----------------------------------------------- Key: JBIDE-17611 URL: https://issues.jboss.org/browse/JBIDE-17611 Project: Tools (JBoss Tools) Issue Type: Bug Components: common/jst/core Affects Versions: 4.2.0.Beta2 Environment: JBT 4.2.0.Beta2-v20140613-0238-B137 Reporter: Vlado Pakan Assignee: Victor Rubezhny Priority: Blocker Labels: respin-d Fix For: 4.2.0.Beta2, 4.2.0.Beta3 See this comment https://issues.jboss.org/browse/JBIDE-17566?focusedCommentId=12975919&... Seems reproducible only for first attempt and then need to restart JBT to get exception again