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From: Paolo Di Tommaso <paolo.ditommaso@gmail.com>
Date: Sun, 7 Jun 2015 15:49:26 +0200
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 <CADgKzdx98jKJO_gu8QusvpvBo1DufG8__hs8yJd511R2WFbWrg@mail.gmail.com>
Subject: Re: NPE exception on ManagedLinkedList
To: users@groovy.incubator.apache.org
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Well, the point it that I'm not using any ManagedLinkedList object in my
code.

At a first look it seems to me a side effect of this change:

https://issues.apache.org/jira/browse/GROOVY-6704


Does that make sense ?


Cheers,
Paolo


On Sun, Jun 7, 2015 at 12:57 PM, Jochen Theodorou <blackdrag@gmx.org> wrote:

> Am 29.05.2015 15:15, schrieb Paolo Di Tommaso:
>
>> Dear all,
>>
>> Upgrading to Groovy 2.4.3 I've started to experience a
>> NullPointerException that is raised somehow randomly.
>>
>
> The source code line is:
>
>              if (previous != null && previous.next != null) {
>>
>
> this can cause a NPE if there is a data race... funny thing is, the
> comment of the class says:
>
>   * This class does not support concurrent modifications nor will it check
>>  * for them. This class is also not thread safe.
>>
>
> Which strongly suggests, that the class is not used as intended
>
> hmm... the entry points look right... that can only mean that it is the
> ReferenceManager re-usage, that is causing trouble here.
>
> bye blackdrag
>
> --
> Jochen "blackdrag" Theodorou
> blog: http://blackdragsview.blogspot.com/
>
>

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<div dir=3D"ltr">Well, the point it that I&#39;m not using any ManagedLinke=
dList object in my code.=C2=A0<div><br></div><div>At a first look it seems =
to me a side effect of this change:=C2=A0</div><div><br></div><div><a href=
=3D"https://issues.apache.org/jira/browse/GROOVY-6704">https://issues.apach=
e.org/jira/browse/GROOVY-6704</a><br></div><div><br></div><div><br></div><d=
iv>Does that make sense ?=C2=A0</div><div><br></div><div><br></div><div>Che=
ers,<br>Paolo</div><div><br></div><div><span style=3D"font-size:17.60000038=
14697px"><br></span></div></div><div class=3D"gmail_extra"><br><div class=
=3D"gmail_quote">On Sun, Jun 7, 2015 at 12:57 PM, Jochen Theodorou <span di=
r=3D"ltr">&lt;<a href=3D"mailto:blackdrag@gmx.org" target=3D"_blank">blackd=
rag@gmx.org</a>&gt;</span> wrote:<br><blockquote class=3D"gmail_quote" styl=
e=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-left:1ex"><span c=
lass=3D"">Am 29.05.2015 15:15, schrieb Paolo Di Tommaso:<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
Dear all,<br>
<br>
Upgrading to Groovy 2.4.3 I&#39;ve started to experience a<br>
NullPointerException that is raised somehow randomly.<br>
</blockquote>
<br></span>
The source code line is:<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
=C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 =C2=A0 if (previous !=3D null &amp;&amp;=
 previous.next !=3D null) {<br>
</blockquote>
<br>
this can cause a NPE if there is a data race... funny thing is, the comment=
 of the class says:<br>
<br>
<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex">
=C2=A0* This class does not support concurrent modifications nor will it ch=
eck<br>
=C2=A0* for them. This class is also not thread safe.<br>
</blockquote>
<br>
Which strongly suggests, that the class is not used as intended<br>
<br>
hmm... the entry points look right... that can only mean that it is the Ref=
erenceManager re-usage, that is causing trouble here.<br>
<br>
bye blackdrag<span class=3D"HOEnZb"><font color=3D"#888888"><br>
<br>
-- <br>
Jochen &quot;blackdrag&quot; Theodorou<br>
blog: <a href=3D"http://blackdragsview.blogspot.com/" target=3D"_blank">htt=
p://blackdragsview.blogspot.com/</a><br>
<br>
</font></span></blockquote></div><br></div>

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