Question

The hibernate named query returns a BigDecimal for a column that has datatype NUMBER.

select col1 as "col1" from table1 union select col2 as "col1" from table2

On client side, I expect the datatype of col1 to be long (primitive)
I do this:

<return-scalar column="col1" type="java.lang.Long" />

or

<return-scalar column="col1" type="long" />

In both cases, I get :

java.lang.ClassCastException: java.math.BigDecimal incompatible with java.lang.Long

How can I fix this? My suspiscion, something wrong with the aliasing?

Answer 1

Oracle NUMBER maps to BigDecimal in Hibernate by default. Try setting the type to BigDecimal.