Is there a difference between null and NULL?

[sihui]

After openhabe 2.3 update, homematic binding don't update item status

Not quite right. null !== NULL NULL is an Object of type State and it is a special State Items can have to indicated the Item is uninitialized. As an Object, NULL does have a .equals method so == should be used. null is a primitive speical work in the programming langauge to indicate no value. As a primitive, null does not have a .equals method so one should use the identity operator === instead of the equivalency operator ==. So === and !== should only be used with null and never used with N…

[SOLVED] Error in rules (Cannot reference the field 'NULL' before it is defined)

NULL != null NULL is a special State that an Item can have to indicate it is uninitialized. null is a programming construct that means no value. The two are distinct be and not interchangeable.