EAP 6.1.0 is not supported in JBDS 6.0.1. As a consequence, EAP 6.1.0 Server runtime libraries are not present on its classpath and JBDS 6.0.1 throws the following errors:
"The type javax.validation.ConstraintViolation cannot be resolved. It is indirectly referenced from required .class files."
"The project was not built since its build path is incomplete. Cannot find the class file for javax.persistence.EntityManager."
As a workaround for this issue, use JBDS version 7.0.0.Beta1 or later.