Well it turns out ~/.java/deployment/deployment.properties gets overwritten VERY often. So one must add that line back to it VERY often.
A Google search about this file turns up the usual confusing answers. And I had dreams one could workaround this bug without being root. And I had dreams someone would fix this bug. __ This is the maintainer address of Debian's Java team <http://lists.alioth.debian.org/cgi-bin/mailman/listinfo/pkg-java-maintainers>. Please use debian-j...@lists.debian.org for discussions and questions.