[GROOVY-8200] Shorthand |= results in NPE

• Type: Bug
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.3.11
• Fix Version/s: 2.5.0-beta-2
• Environment: Groovy Version: 2.3.11 JVM: 1.7.0_80 Vendor: Oracle Corporation OS: Linux; ; java version "1.7.0_80"; Java(TM) SE Runtime Environment (build 1.7.0_80-b15); Java HotSpot(TM) 64-Bit Server VM (build 24.80-b11, mixed mode)
• Assignee: Paul King
• Reporter: Daniel Hammer
• Created: 23/May/17 12:54
• Updated: 06/Mar/18 23:25
• Resolved: 24/Sep/17 10:55

Description

I've stumbled across some curious behaviour for the shorthand assignment operator in Groovy v2.3.11 (symptom also present in Groovy v2.4.9).

The following boolean or logic, unexpectedly throws NullPointerException.

boolean x = null

// short hand unrolled:  x = null || x

x |= null // -> unexpected NullPointerException

assert !x

The same approach for boolean and logic, performs as expected.

boolean x = null

// short hand unrolled:  x = null && x

x &= null

assert !x

It's possible to work around the issue with explicit cast.

x |= null as boolean

Issue Links

• links to: GitHub Pull Request #555