Re: [castor-user] [XML] NullPointerException when a class overrides parent class

[Keith Visco]

Thanks Dave, I saw the bug report and will look into it further.
--Keith
David Leangen wrote:
Ok, no problem.
I'll give that a try and, if there are no side effects, I'll assume that
this is the "right" thing to do and provide a patch.
However, somebody such as you with a deeper knowledge of the system
internals may want to take a look anyway to make sure that this is the right
approach. So, I'll flag this in Bugzilla for follow up.
Regards,
Dave


-----Original Message-----
From: Keith Visco [mailto:[EMAIL PROTECTED]
Sent: 5 November 2004 5:16
To: [EMAIL PROTECTED]
Subject: Re: [castor-user] [XML] NullPointerException when a
class overrides parent class

Hi David,
For now, can you wrap the localElements[i].getValidator() in a null check:
if (localElements[i] != null) {
}
--Keith
David Leangen wrote:
Dear List,
I am having a problem with a NullPointerException with a very
specific case.
I have two classes that are pure value objects, one overriding
the other.
Generally:
public class ParentClass
{
 public int id;
 public void setId(int id)
 {
   this.id = id;
 }
 public int getId()
 {
   return id;
 }
}
and
public class ChildClass extends ParentClass
{
 public void setId(int id)
 {
   this.id = id;
 }
 public int getId()
 {
   return id;
 }
}
The NPE occurs during unmarshalling.
Note that if I take out the overriding getters and setters, the
problem goes
away. I can still unmarshall the id value from the parent class
in the child
class. It is only when I override the getters and setters that
this problem
occurs.

I traced the problem to this line in XMLClassDescriptorImpl:
 Line 891:
   FieldValidator fieldValidator = localElements[i].getValidator();
Each of the local elements that is overridden becomes null, so calling
getValidator throws a NPE.

Note that the same NPE happens when I override other values, too.
Any ideas about how to work around the problem?
Thanks!
Dave


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