JPA/Hibernate call SQL Server Stored procedure with default values for paramerers

Question

I am calling a sql server stored procedure with 10 parameters. The first 2 parameters expects values to be passed, all the others have default values set. I am calling the stored procedure as shown below -

entityManager.createStoredProcedureQuery("my_proc")
    .registerStoredProcedureParameter("param1", String.class, ParameterMode.IN)
    .
    . 
    . // register all 10 parameters
    .setParamater("param1", value1)
    .setParameter("param2", value2) // set values only for the first 2 parameters
    .execute();

When I run this with param_null_passing=false, I get an error - Value not set for parameter null.

When param_null_passing=true, procedure is called but null values are passed for parameters with default values.

How can the procedure be called without explicitly passing values for parameters with default values?

Thank you.