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From "David I. (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-349) Deadlock using ReflectionToStringBuilder
Date Thu, 20 Sep 2007 13:30:35 GMT

    [ https://issues.apache.org/jira/browse/LANG-349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12529106
] 

David I. commented on LANG-349:
-------------------------------

I have not given it a try yet, but it makes sense and sounds like it would work.

> Deadlock using ReflectionToStringBuilder
> ----------------------------------------
>
>                 Key: LANG-349
>                 URL: https://issues.apache.org/jira/browse/LANG-349
>             Project: Commons Lang
>          Issue Type: Bug
>    Affects Versions: 2.0
>         Environment: java version "1.5.0_10"
> Java(TM) 2 Runtime Environment, Standard Edition (build 1.5.0_10-b03)
> Java HotSpot(TM) Server VM (build 1.5.0_10-b03, mixed mode)
> >uname -a
> Linux fwjsfimat04 2.4.21-32.EL #1 SMP Fri Apr 15 21:02:58 EDT 2005 x86_64 x86_64 x86_64
GNU/Linux
>            Reporter: David I.
>            Priority: Critical
>             Fix For: 2.4
>
>
> I used the ReflectionToStringBuilder on an object to output debugging messages to Log4j.
If this object was picked up by two different threads and the toString() method was called
at the same time in two different threads, a deadlock occurrs.
> Here is a stack trace from using jstack:
> Thread 1172: (state = BLOCKED)
>  - java.util.Vector.hashCode() @bci=0, line=938 (Interpreted frame)
>  - java.util.HashMap.containsKey(java.lang.Object) @bci=6, line=377 (Compiled frame)
>  - org.apache.commons.lang.builder.ReflectionToStringBuilder.toString() @bci=50, line=522
(Compiled frame)
>  - org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(java.lang.Object,
org.apache.commons.lang.builder.ToStringStyle, boolean, java.lang.Class) @bci=12, line=265
(Interpreted frame)
>  - org.apache.commons.lang.builder.ReflectionToStringBuilder.toString(java.lang.Object,
org.apache.commons.lang.builder.ToStringStyle) @bci=4, line=197 (Interpreted frame)
>  - org.apache.commons.lang.builder.ToStringBuilder.reflectionToString(java.lang.Object,
org.apache.commons.lang.builder.ToStringStyle) @bci=2, line=170 (Interpreted frame)
> [...]
> Thread 1191: (state = BLOCKED)
>  - java.util.Vector.hashCode() @bci=0, line=938 (Interpreted frame)
>  - java.util.HashMap.containsKey(java.lang.Object) @bci=6, line=377 (Compiled frame)
>  - org.apache.commons.lang.builder.ReflectionToStringBuilder.toString() @bci=50, line=522
(Compiled frame)
>  [...]

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