reference (1:1) and null

[Edson Carlos Ericksson Richter <ed...@mgrinformatica.com.br>]

Hi!

When retrieving a 1:1..0 mapping using proxies, after counting how many 
values has in the table, OJB should set the referenced object to NULL 
when counting is 0 (not setting the reference for a proxy that will give 
a NPE when trying to call a method).

If the value set is a proxy (event if will never have a value there, 
since count is 0) the following statement always goes to else section, 
and gives a NPE:

// The following test is always false, because until now, 
myReferencedObject is a reference to a proxy.
// But the select count(*) returned 0.
if( myObject.myReferencedObject==null ) {
  System.out.println("There is no reference");
} else {
  System.out.println("There is reference!");
  System.out.println("myObject.myReferencedObject.getId() = " + 
myObject.myReferencedObject.getId());
  // the previous line will throw a NPE, because when materializing, it 
return NULL!!!
}

Is possible to fix this? There is one workaround, map all 1:0..1 
mappings as collections and does internal treatment to them, or not use 
Proxy for 1:0..1 mappings (that will set value to NULL when there is no 
referenced object - as expected).

Thanks,

Edson Richter



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