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https://issues.apache.org/jira/browse/LOG4J2-1037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14569291#comment-14569291
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Ralph Goers commented on LOG4J2-1037:
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I am not much of a fan of the NDC but implemented the ThreadContext stack so we
could be compatible with Log4j 1.x. If the behavior of the context stack isn't
the same as the NDC then it should be changed. IOW - the fix should go in to
ThreadContext.pop to behave as 1.x does.
> Backward compatibility issue with log4j-1.2-api
> -----------------------------------------------
>
> Key: LOG4J2-1037
> URL: https://issues.apache.org/jira/browse/LOG4J2-1037
> Project: Log4j 2
> Issue Type: Bug
> Components: log4j 1.2 emulation
> Affects Versions: 2.2
> Reporter: Marc Dergacz
> Priority: Minor
>
> While going through and migrating our projects to log4j 2.2, there are
> several apps and 3rd party libraries that we use that depend on log4j 1.2.
> Whilst the log4j-1.2-api library pretty much works flawlessly for us, I ran
> into an issue today with the opensaml1 library which breaks when it tries to
> call NDC.pop().
> In log4j 1.2, NDC.pop() would check to see if the stack was empty and if it
> was, returned an empty string but with the log4j-1.2-api library, the
> DefaultThreadContextStack.pop() ends up throwing a NoSuchElementException
> which causes everything to fall over for us.
> Given the library is meant to provide backwards compatibility, shouldn't the
> behaviour also be the same? At present, upgrading the OpenSAML library isn't
> an option, frustratingly.
> ] Unhandled exception: - java.util.NoSuchElementException: The ThreadContext
> stack is empty
> at
> org.apache.logging.log4j.spi.DefaultThreadContextStack.pop(DefaultThreadContextStack.java:185)
> at org.apache.logging.log4j.ThreadContext.pop(ThreadContext.java:391)
> at org.apache.log4j.NDC.pop(NDC.java:121)
> at org.opensaml.SAMLException.getInstance(Unknown Source)
> at org.opensaml.SAMLResponse.fromDOM(Unknown Source)
> at org.opensaml.SAMLResponse.<init>(Unknown Source)
> at
> org.jasig.cas.client.validation.Saml11TicketValidator.parseResponseFromServer(Saml11TicketValidator.java:51)
> at
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