I got a legacy database domain I can\'t change but it was possible conceive a domain entity to address my problema.
Legacy Tables: TABLE1(ID,VALUE) TABLE2(ID,DATE)
Use @SecondaryTable
(http://en.wikibooks.org/wiki/Java_Persistence/Tables#Multiple_tables)
@Entity
@Table(name="TABLE1")
@SecondaryTables({
@SecondaryTable(name="TABLE2",
pkJoinColumns = @PrimaryKeyJoinColumn(name="ID", referencedColumnName="ID")
),
@SecondaryTable(name="TABLE3",
pkJoinColumns = @PrimaryKeyJoinColumn(name="ID", referencedColumnName="ID")
)}
)