How can we declare variables in sql and run the Stored procedure in java passing those variables?

Question

Stored procedure run structure is like this :

var sampleVar REFCUSOR;
EXEC SAMPLE_PROC(P_DATE=>TO_DATE('01-JAN-21','DD-MON-YY'),P_DETAILS=>:sampleVar);

I need to run this SP using Java code. But getting error while running 'var sampleVar REFCUSOR;' statement. Error: Invalid Sql statement.

How to resolve this error? Any alternate way to successfully run this Stored Proc using Java.