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https://issues.apache.org/jira/browse/CLI-209?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12915694#action_12915694
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Sebb commented on CLI-209:
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Another way to fix the class would be to turn all the static variables into
instance variables, and add parallel instance methods. The static methods would
then use a static singleton instance. That would allow use from multiple
threads without the overhead of ThreadLocal.
The library would still not be thread-safe, but at least it could be used by
multiple threads in parallel so long as each thread had its own instances.
> OptionBuilder is not thread-safe
> --------------------------------
>
> Key: CLI-209
> URL: https://issues.apache.org/jira/browse/CLI-209
> Project: Commons CLI
> Issue Type: Bug
> Components: CLI-1.x
> Affects Versions: 1.0, 1.1, 1.2
> Environment: Windows XP, Java 6
> Reporter: Thomas Herre
>
> Class OptionBuilder is not thread-safe.
> It uses one OptionBuilder instance without synchronizing access to it.
> If more than one thread uses OptionBuilder, that can result in invalid
> Options (suppose a scheduler component).
> Don't know if this should be fixed. At least the Javadoc should mention the
> fact that the class is not thread-safe.
> As a workaround, use constructor of class Option.
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