[jira] [Commented] (LOG4J2-555) Location-based functionality broken in AbstractLoggerWrapper subclasses

["Ralph Goers (JIRA)" <ji...@apache.org>]

    [ https://issues.apache.org/jira/browse/LOG4J2-555?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13917300#comment-13917300 ] 

Ralph Goers commented on LOG4J2-555:
------------------------------------

AbstractLogger is correct.  Applications that invoke its methods will work correctly.  The problem here is that all the calls from a custom logger should use the log(final Marker marker, final String fqcn, final Level level, final Message data, final Throwable t) method of AbstractLoggerWrapper and provide the fqcn.

> Location-based functionality broken in AbstractLoggerWrapper subclasses
> -----------------------------------------------------------------------
>
>                 Key: LOG4J2-555
>                 URL: https://issues.apache.org/jira/browse/LOG4J2-555
>             Project: Log4j 2
>          Issue Type: Bug
>          Components: API, Core
>    Affects Versions: 2.0-rc1
>            Reporter: Remko Popma
>            Assignee: Remko Popma
>             Fix For: 2.0-rc2
>
>
> *How to reproduce*
> * Create a custom logger that extends {{AbstractLoggerWrapper}} (or generate one with the tool attached to LOG4J2-519)
> * In the custom logger provide a public method that invokes the {{log(Level, String)}} method
> * Configure a pattern layout that uses location, like %C for the logger FQCN
> * From a sample app, call the public method on your custom logger.
> * The output will show the class name of the custom logger instead of the class name of the calling class in the sample application.
> *Cause*
> {{AbstractLogger}}'s FQCN field is {{static final}} and initialized to {{AbstractLogger.class.getName()}}. Then, in {{Log4jLogEvent#calcLocation()}}, when walking over the stack trace elements, the element _following_ the FQCN is returned. So only loggers that directly subclass from {{AbstractLogger}} will work correctly. Loggers that inherit from {{AbstractLoggerWrapper}} are two levels removed from {{AbstractLogger}} and the {{calcLocation()}} method will not work correctly.
> *Solution*
> I think {{AbstractLogger}}'s FQCN field should be made non-static, and initialized to {{getClass().getName()}} in the constructor of {{AbstractLogger}}. {{Log4jLogEvent#calcLocation()}} can then be modified to return the {{StackElement}} whose class name matches the FQCN, instead of the next element. Location-based functionality should then work for arbitrarily deep subclass hierarchies of AbstractLogger.



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