It would be good to be able to set the length of a string on an entity. If you do :

field string --named title ;
constraint Size --onProperty title --max 2000

You will get :

@Column
@Size(max = 2000)
private String title;

Even in Java EE 7, the integration between JPA and Bean Validation hasn't been made. So this doesn't create a column in the DB with 2000 char long. What you would need is :

@Column(length = 2000)
@Size(max = 2000)
private String title;

It would be good to have extra length parameter, something like :

field string --named title --length 2000;

See : http://lists.jboss.org/pipermail/forge-dev/2012-December/002878.html