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From "Henri Yandell (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LANG-349) Deadlock using ReflectionToStringBuilder
Date Tue, 21 Aug 2007 17:49:30 GMT

    [ https://issues.apache.org/jira/browse/LANG-349?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#action_12521539
] 

Henri Yandell commented on LANG-349:
------------------------------------

I'm a little confused by the thread dump - ReflectionToStringBuilder.toString does not call
HashMap.containsKey. Seems like a bunch of method calls are missing. Presumably this is because
things are being compiled in and so that part of the trace vanishes.

This leaves me wondering where the HashMap.containsKey is coming from. Presumably it's from
the object that is being reflected upon, and I'm not sure I see us having many options beyond
either a) ignoring this bug as not fixable, or b) making the builders totally synchronized.


Any thoughts?

> 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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