Suspicious reference comparison

omero-server/src/main/java/ome/logic/UpdateImpl.java

Line 315 in d64ded2

if (previousId != null && previousId != currentId) {

Lines 311 – 315:
final Long previousId = obj.getId();
IObject result = (IObject) filter.filter(null, obj);
result = (IObject) session.merge(result);
final Long currentId = result.getId();
if (previousId != null && previousId != currentId) {

Regarding line 315 and the 2'nd != operator.

I think since previousId and currentId are both Long objects, the != operator compares the object references and not the values. The equals() method should be used.

I think line 315 should be :
if (previousId != null && !previousId.equals(currentId) {

Example snippet:

      	Long a = (long)1000;
         Long b = (long)(999 + 1);
	

	System.out.println("compare != is " + (a!=b));		

   	System.out.println("!equals is " + !a.equals(b));

Output:

compare != is true
!equals is false

False should be the correct output

👍