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From "Jochen Theodorou (JIRA)" <j...@apache.org>
Subject [jira] [Resolved] (GROOVY-8200) Shorthand |= results in NPE
Date Tue, 23 May 2017 18:46:04 GMT

     [ https://issues.apache.org/jira/browse/GROOVY-8200?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jochen Theodorou resolved GROOVY-8200.
--------------------------------------
    Resolution: Not A Bug
      Assignee: Jochen Theodorou

x|=null is x=x|null, which results in x.or(null). You will see here that the expanded version
and shorthand work the same. x=x||null will first convert x to boolean and depending on true
or false we will also convert the null. Similar for the logic and binary and.


> Shorthand |= results in NPE
> ---------------------------
>
>                 Key: GROOVY-8200
>                 URL: https://issues.apache.org/jira/browse/GROOVY-8200
>             Project: Groovy
>          Issue Type: Bug
>    Affects Versions: 2.3.11
>         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)
>            Reporter: Daniel Hammer
>            Assignee: Jochen Theodorou
>         Attachments: shorthand_and.groovy, shorthand_or_symptom.groovy
>
>
> 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|^shorthand_or_symptom.groovy], unexpectedly throws {{NullPointerException}}.
> {code}boolean x = null
> // short hand unrolled:  x = null || x
> x |= null // -> unexpected NullPointerException
> assert !x{code}
> The same approach for [boolean and logic|^shorthand_and.groovy], performs as expected.
> {code}boolean x = null
> // short hand unrolled:  x = null && x
> x &= null
> assert !x{code}
> It's possible to work around the issue with explicit cast.
> {code}x |= null as boolean{code}



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