null values in primitive types

nicolemcgrgr50 · **Joined:** Tue Feb 10, 2009 3:31 pm **Posts:** 3

Hello,

I'm getting Property Access Exception "Null value was assigned to a property of primitive type" when I try to use session.find.

I have primitive-type members in my java classes, and related fields in the database tables can have null values.

I wonder is this allowed or not?
and if it's not allowed the only way to overcome this problem is to convert primitive fields to wrapper types (e.g. long to Long). (I cannot change database structure for now)
Right?

parmendratyagi · **Posted:** Wed Feb 11, 2009 8:15 am

You are right.
This error occurs when hibernate try to fill the object and it try to assign the null value to the primitive type of property.

User wrapper class instead of primitive data types to overcome this problem.

stephaneeybert · **Joined:** Mon Apr 16, 2007 8:10 am **Posts:** 246

But then, if one has a table with allowed null values, but still thinks of storing only 0 or 1 values, how to make sure to retrieve a 0 if the stored value is accidently null ?

Note that I can't change the table structure.

parmendratyagi · **Posted:** Thu Jan 14, 2010 3:26 am

@stephaneeybert :-you can do that by setting the value 0 when encounted "null" in setter method.. But for that you have to make change in your configuration so that hibernate use "method" instead of "field" to set/get the values. for example :-

Code:

@Column(name="value")
public void setValue(Integer value){
if(value == null)
    this.value = new Integer(0);
else
    this.value = value;
}

Cameron McKenzie · **Posted:** Sun Jan 17, 2010 1:04 pm

Also, setting defaults at the database level can help to avoid this as well.