How to call a custom Oracle function returning a value from JPA

Question

I have a custom function in oracle returning a number after deleting records. I could get a value in sql_plus such as

call my_function(4) into :out_number;
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Answer 1

I used this to execute native functions in oracle:

Query query = em.createNativeQuery("select my_function(:param) from dual");
query.setParameter("param", 4);
return query.getSingleResult();