I need LastUpdatedDttm to be updated by SYSDATE whenever record is updated. But below annoataions do nt work as desired. SYSDATE is inserted only once and not updated for subsequent updations. Also, lastUpdDTTM is not part of sql generated by hibernate.

@Generated(GenerationTime.ALWAYS)
@Column(name="LAST_UPDATED_DTTM",insertable=false,updatable=true, columnDefinition ="timestamp default SYSDATE")
private Date lastUpdDTTM;

@Generated(GenerationTime.ALWAYS)
@Column(name="CREATED_DTTM", insertable=false, updatable=false)
private Date createdDTTM;