If you try and add an Address to an existing User you get a nasty stacktrace: [junit] com.redhat.rhn.common.db.WrappedSQLException: ORA-01400: cannot insert NULL into ("WEB"."WEB_USER_SITE_INFO"."ADDRESS1") [junit] at oracle.jdbc.dbaccess.DBError.throwSqlException(DBError.java:134) [junit] at oracle.jdbc.oci8.OCIDBAccess.check_error(OCIDBAccess.java:2337) [junit] at oracle.jdbc.oci8.OCIDBAccess.executeFetch(OCIDBAccess.java:1744)