'How to persist Map with subMap into table?

I have entity with id and map with map inside:

@Data
public class Item {
   Long id;
   Map<String, Map <String, String> params;
}

how to persist params into single separate table with using hiberante:

id, item_id,      string,              string,                  string
 1      1    ValueFromOuterMap      key1FromInnerMap      value1FromInnerMap
 2      1    ValueFromOuterMap      key2FromInnerMap      value2FromInnerMap
sqlpostgresqlhibernatespring-data-jpa


Solution 1:[1]

Dig into @ElementCollection and (@CollectionTable, @MapKeyJoinColumn) for adjustments.

Sources

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Source: Stack Overflow

Solution Source
Solution 1 Andriy Slobodyanyk

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