Bug? java.lang.NullPointerException on Null value

[PatrikCavina]

This code causes an error:

    If Null = "aa" Then
        Log("Ok")
    Else
        Log("No")
    End If

But if i write the code in this way errors don't happen::

    If "aa" = Null Then
        Log("Ok")
    Else
        Log("No")
    End If

I don't think is a normal behavior

 

[sorex]

I guess the logic is that NULL is non existing.

You can't compare something that doesn't exist with a string.

But you can compare a string with being nothing.

 

[Erel]

This is the expected behavior. As part of the comparison a method is called on the left side object (for non-primitive types). This fails when the left side value is Null.
There is a special case with explicit Nulls on the right side which changes the way the comparison is made (reference check).