hibenrate weird question

[火雲邪神]

Hi
I am using hibernate, i got two class "JMPDATA" and "PARAMETER", they are linked together. Then I execute :

session.createSQLQuery("SELECT a.* from JMPDATA").addEntity(JmpData.class);

I didn't join table parameter, but i still able to get the value of it, why?

iterator = query.list().iterator();
while (iterator.hasNext()) {
JmpData d = iterator.next();
for (Parameter p : d.parameters) {
System.out.println("\t" + p.name);
}
}

I am using H2 database, and i enable the trace log, i saw the h2 is receive this sql command from hibernate. I am sure it didn't left join the parameter table.

SELECT a.* from JMPDATA as a limit ?

thanks
from Peter ([e-mail])