[GROOVY-9661] Since Groovy 3 ArrayExpression#sizeExpression can suddenly return null

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 3.0.5
• Fix Version/s: 4.0.0-alpha-1, 3.0.6
• Assignee: Paul King
• Reporter: Björn Kautler
• Created: 27/Jul/20 00:26
• Updated: 11/Nov/20 02:01
• Resolved: 31/Jul/20 22:36

Description

Before Groovy 3, ArrayExpression#sizeExpression never was null, because you could only write new Object[0][1], but {{new Object[] { 1, 2 }}} was not valid syntax.

Now with Groovy 3 both syntaxes are valid.
In the former case you get for expressions an empty list and for sizeExpression a list with the two size expressions.
In the latter case you get for expressions a list with the two member expressions and for sizeExpression you get null.

This is somewhat unexpected and inconsistent.
Some code (Spock currently does unless https://github.com/spockframework/spock/pull/1203/files gets merged) might assume sizeExpression is always non-null as it always was.

I asked Paul and he said this should probably be fixed on Groovy side to also provide an empty list here, so here is the according issue.