Hello. I'm trying to map a column in a table to another column in a different table. county_id is the column in the my current object and I'm trying to match it to tinyid which is the column in the other object. What am I doing wrong? Product Class County county; @OneToOne(fetch=FetchType.LAZY, cascade={CascadeType.ALL}) @JoinColumn(name="county_id", referencedColumnName="tinyid") public County getCounty() { return county; } public void setCounty(County county) { this.county = county; } View the original post : http://www.jboss.com/index.html?module=bb&op=viewtopic&p=3995798#... Reply to the post : http://www.jboss.com/index.html?module=bb&op=posting&mode=reply&a...