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From "Ralph Goers (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LOG4J2-1037) Backward compatibility issue with log4j-1.2-api
Date Tue, 02 Jun 2015 15:31:19 GMT

    [ https://issues.apache.org/jira/browse/LOG4J2-1037?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14569272#comment-14569272

Ralph Goers commented on LOG4J2-1037:

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
>         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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