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https://issues.apache.org/jira/browse/WSCOMMONS-489?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12762408#action_12762408
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Andreas Veithen commented on WSCOMMONS-489:
-------------------------------------------

1.6.0.5 is quite old. It could be that you are seeing the issue that the SJSXP 
project fixed in [1]. This issue implies that even after setting 
"reuse-instance" to false on the XMLOutputFactory, the factory is still not 
thread safe. I will see if I can find a 1.6.0.5 JDK somewhere to check this.

[1] 
https://sjsxp.dev.java.net/source/browse/sjsxp/zephyr/src/com/sun/xml/stream/ZephyrWriterFactory.java?rev=1.8&r1=1.4&r2=1.5

> StAXUtils incorrectly assumes that XMLInputFactory and XMLOutputFactory 
> instances are thread safe
> -------------------------------------------------------------------------------------------------
>
>                 Key: WSCOMMONS-489
>                 URL: https://issues.apache.org/jira/browse/WSCOMMONS-489
>             Project: WS-Commons
>          Issue Type: Bug
>          Components: AXIOM
>    Affects Versions: Axiom 1.2.8
>            Reporter: Andreas Veithen
>            Assignee: Andreas Veithen
>             Fix For: Axiom 1.2.9
>
>
> StAXUtil uses a single XMLInputFactory or XMLOutputFactory instance (per 
> classloader). This means that it makes the assumption that these instances 
> are thread safe. However, there is nothing in the StAX specs that guarantees 
> that, and Sun's implementation in JDK 6 is not thread safe, at least with the 
> default properties [1] [2].
> [1] 
> http://www.java2s.com/Open-Source/Java-Document/6.0-JDK-Modules-com.sun/xml/com/sun/xml/internal/stream/XMLInputFactoryImpl.java.htm
> [2] 
> http://www.java2s.com/Open-Source/Java-Document/6.0-JDK-Modules-com.sun/xml/com/sun/xml/internal/stream/XMLOutputFactoryImpl.java.htm

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