Sybase and NOT NULL columns

[anajavi]

When using JBoss CMP to create tables on Sybase, all fields are NOT NULL.
Is there a way to prevent this?

Sybase uses strange syntax where you have to define nullable columns instead of NOT NULL columns. For example:
VARCHAR(255) NULL.

[anajavi]

Actually I found how to do it by modificating JBoss source:
org.jboss.ejb.plugins.cmp.jdbc.SQLUtil has the following:

buf.append(columnNames).append(" ").append(sqlTypes);
if(notNull) {
buf.append(" NOT NULL");
}

by adding:
else {
buf.append(" NULL");
}

Seems to work with PostgreSQL at least. Do not know if it breaks other db's.
Is it possible to have this kind of modification on JBoss source?