Most databases allow to have field with current timestamp (act as creation timestamp), for example in MySQL:
CREATE TABLE t (ts TIMESTAMP DEFAULT CURRENT_TIMESTA
This can be done as suggested by Simon, but it might be worth checking out a fuller solution.
Check out this Spring Roo Timestamp add-on. It adds 'created' and 'updated' timestamps to all entities marked with its annotation. https://github.com/rcaloras/spring-roo-addon-timestamp
(I created it, happy to answer questions or add additional features)
This would be created with:
field date --fieldName ts --type java.util.Date --persistenceType JPA_TIMESTAMP
This will add:
@Temporal(TemporalType.TIMESTAMP)
to the field, which should cause the auto-generator to create a TIMESTAMP field. If you want more control, you can always annotate the generated entity field further with
@Column(name="ts", columnDefinition="TIMESTAMP DEFAULT CURRENT_TIMESTAMP")