Hibernate two tables and one object

Programmer Question

Hello,

I have this situtation:

Table1: 
tab_id
field11
field12


Table2
id
tab_id
field21
field22

I have to create one object on this two tables for example:

object: 

@Id
tabId

@Colummn(name="field11")
field11

@Colummn(name="field12")
field12

@Colummn(name="field21")
field21

When i update field21 table2 should update this field, but table1 doesn't have any information about table2, only table2 hat foreign key to table1

Any idea how i should this make ?

I cannot change table structure, i can only create new class in java.

Find the answer here