XML verification fails in precommit

When XML files are modified the precommit job fails on branch-1 with script engine for language js can not be found. Precommit job uses JDK7 on branch-1 where JavaScript engine is not available.

busbey mentioned the following solutions:

We could fix the script engine problem with any of:

Switching to a jdk7 that has a JavaScript engine still (I do not know what JDK is freely available, updated, and has a JavaScript engine)
Disabling the check entirely
Make the existing check only run when we're using jdk8 (so currently nightly only)
Replacing the check with one based on xmllint (and installing xmllint in our docker image)