unchecked cast warning on Collection

Question

I am mapping a postgres array_agg value to a list, but I'm getting a warning below Unchecked cast: 'java.lang.Object' to 'java.util.Collection<java.lang.String> What is the fix for this?

public UserDTO transformTuple(Object[] objects, String[] strings) {
    List<String> roleList = new ArrayList<>((Collection<String>)objects[7]);

Answer 1

You need to create Custom Types so that your java application can map postgresql data type into your application, I assume you are using hibernate in this scenario so here is a reference link for further details.

And here other link reference you can look

Using Java arrays to insert, retrieve, & update PostgreSQL arrays

PostgreSQL Array