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https://jira.qos.ch/browse/SLF4J-389?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=18173#comment-18173
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Ceki Gülcü commented on SLF4J-389:
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Hi [~michael-o],
On January 111th, I have posted [a message on the maven-dev mailing
list|http://markmail.org/message/5x2dpmy3szzfiv5k] inquiring whether this
change could have any effect on Maven. There was no response to this message.
To answer your question, there's a possibility that Maven would be affected if
if a given plugin modifies the value of System.out or System.err and further
assumes that Maven’s log output will be directed to the old value of the
stream. I can't say for sure.
In any case, if Maven is affected, the old behavior can be re-introduced as a
configuration option. Please let me know what you think.
> SimpleLogger caches System.err and System.out
> ---------------------------------------------
>
> Key: SLF4J-389
> URL: https://jira.qos.ch/browse/SLF4J-389
> Project: SLF4J
> Issue Type: Bug
> Affects Versions: 1.7.x
> Reporter: Igor Polevoy
> Assignee: Ceki Gülcü
> Fix For: 1.7.23
>
>
> We usually use SimpleLogger in tests, and some other binding when running in
> production.
> In some cases, our tests depend on log values logged through the logger
> during a test.
> Unfortunately between version 1.7.0 and 1.7.1 this ability has been removed,
> since the SimpleLogger now caches the system stream in a static initialiser.
> Here is the code that broke this approach:
> https://github.com/qos-ch/slf4j/commit/996ccc7ca507994465c069554954ecb01890d4d5
> Basically, we would write a test:
> {quote}PrintStream err = System.err;
> PrintStream temp = new PrintStream(some buffer here);
> System.err = temp;
> // run tests
> System.err = err;
> // here we assert that the temp stream contains values we expect{quote}
> Unfortunately SimpleLogger now caches the system stream and never releases
> it, meaning swapping the streams to catch the output is not possible.
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