Hi,
i got 2 tables wich look like the following.

table Organization (orgId (pk), orgName)

table Employee (empId, empName, fk_orgId)

This is a one (Organization) - to - many (Employee) relationship.
I'd like to have a bidirection relation here, what causes me to insert the following method in the Organization class, i'd like to have all the employees for a specific company (i know that i can get this data from a find query in Employee class, but i'd like to make it this way - straigth call).



Naturally, this method doesn't map to a physical field.
I'm trying to use this mapping on Organization.hbm.xml

[code]
<set
name="employees"
lazy="true"
inverse="false"
cascade="none"
sort="unsorted"
order-by="firstName"
>
<key column="fk_orgId"/>
<one-to-many
class="hibernate.Employee"
/>
</set>[/code

But i get a null pointer exception when trying to access it in the following way.

[code]
Set org10Employees = org1.getEmployees();[/code]

Does anyone know what i'm doing wrong???

Thanks,
ltcmelo

See that here you can take null pointer exception only if "org1" is null.
This exception is not about the "Set"

That's the whole point, org1 is not null.

If i run the app in debug mode and i watch the org1 object at this point, it's fields (orgId and orgName) are instanciated correctly, but the field employees are null. That's why i get the null pointer exception.

The problem is probably because i don't get the employees for the specific company loaded to the organization object, i don't know why.

Have any other ideas???

Thanks,
ltcmelo

For bidirectional one-to-many relationships declare inverse="true" on the many side (set of employees). Also declare and initialize the variable as Set employees = new HashSet();
Mind you still shouldn't have gotten the Null Pointer Exception on org.getEmployees() so maybe something else is wrong. Maybe there's additional logic in the getEmployees() that's causing the problem

Why do i have to declare and instanciate it as HashSet ?

Where exactly, before the getEmployees() method?

Thanks,
ltcmelo

Like this:

Thanks,
actually i stoped getting the nullPointException, but i cannot get the employees of the company yet (the method doesn't return the organization employees).

I posted all my code here
http://forum.hibernate.org/viewtopic.php?t=931275

So, if you could take a look there to see what's wrong, i'd appreciate even more!

Thank you,
ltcmelo

p.s.: altough the code on the link i cited doesn't have the new HashSet(), i've already put it in my current code.