I'm usign Hibernate validator 6.0.14. I'm getting a IndexOutOfBoundsException in my application using Spring Boot 2, Spring Data REST.
Probably the bug comes from Spring but, PathImpl method

private PathImpl(List<Node> nodeList)()

raises a IndexOutOfBoundsException.

Debugging I see the nodeList is empty and of course when you do

(NodeImpl) nodeList.get( nodeList.size() - 1 );

the exception is raised.

This is your source code just to point out better where the problem is (line 373 in HV 6.0.14):

private PathImpl(List<Node> nodeList) {
		this.nodeList = nodeList;
		currentLeafNode = (NodeImpl) nodeList.get( nodeList.size() - 1 );
		hashCode = -1;
		nodeListRequiresCopy = true;
	}

I opened a bug in Spring Data REST (https://jira.spring.io/projects/DATAREST/issues/DATAREST-1342) as well.