How to mix integer and double in the ejbql

[r_q_d]

I have a entity bean like this:

PlayScoreBean

public class PlayScoreBean implements java.io.Serializable{
...
 private Integer rawScore;
 public Integer getRawScore() {
 return rawScore;
 }

 public void setRawScore(Integer rawScore) {
 this.rawScore=rawScore;
 }
}

then an ejbql here:

 Double mean=...
 query = entityManager.createQuery(
 "select sum((c.rawScore-:mean)*(c.rawScore-:mean)) "
 + " from PlayScoreBean as c ");
 query.setParameter("mean", mean);
 Double standardDeviation=(Double) query.getSingleResult();

the rawScore is an Integer , but I am trying to calculate a double value from it. I got this error:

[IntegerType] could not bind value '150.14285714285714' to pa
rameter: 1; java.lang.Double
[STDERR] java.lang.ClassCastException: java.lang.Double

It complains that I cannot bind a double value to integer value.

If I change the rawScore in the entity bean from Integer to Double, then the query works OK, But that is not what I want.

Anybody knows how to mix the integer with double, or is there any number converter functions to call? Anybody can help me to make this work?

Thanks.