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Date: Mon, 12 Nov 2007 12:32:50 -0800 (PST)
From: "Ben Speakmon (JIRA)" <jira@apache.org>
To: issues@commons.apache.org
Subject: [jira] Commented: (LANG-360) Why does appendIdentityToString return
 null?
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    [ https://issues.apache.org/jira/browse/LANG-360?page=3Dcom.atlassian.j=
ira.plugin.system.issuetabpanels:comment-tabpanel#action_12541940 ]=20

Ben Speakmon commented on LANG-360:
-----------------------------------

Looks good. +1.

> Why does appendIdentityToString return null?
> --------------------------------------------
>
>                 Key: LANG-360
>                 URL: https://issues.apache.org/jira/browse/LANG-360
>             Project: Commons Lang
>          Issue Type: Bug
>            Reporter: J=C3=B6rg Gottschling
>             Fix For: 2.4
>
>         Attachments: LANG-360.patch, LANG-360.patch
>
>
> ObjectUtils is designed to handle null imputs gracefully. But ObjectUtils=
.appendIdentityToString does not. It returns null unnessecary if you pass n=
ull als second parameter (the object to get the identity from). For example=
 appendIdentityToString(new StringBuffer(), null) will return null! Which i=
s an uncommen behaviour. Think about code like this:
> ObjectUtils.appendIdentityToString(buffer, param1)
>                     .appendIdentityToString(buffer, param2)
>                     .appendIdentityToString(buffer, param3);
> This will cause an NPE if param1 or param2 ist null. There may be other c=
ode where a NPE will not happen, but the code is used for debugging and the=
re will be an unexpected or wrong output.
> So you shoul return the StringBuffer which is passed in or a new one if n=
ull. The harder question is what to do with the object. I think we should a=
ppend "null" to the StringBuffer, because this is what I would expect and w=
hat the passed reference is.

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