DO NOT REPLY [Bug 31056] New: - (PATCH) Console appender doesn't notice changes to System.out/System.err

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http://issues.apache.org/bugzilla/show_bug.cgi?id=31056

(PATCH) Console appender doesn't notice changes to System.out/System.err

           Summary: (PATCH) Console appender doesn't notice changes to
                    System.out/System.err
           Product: Log4j
           Version: 1.2
          Platform: All
        OS/Version: All
            Status: NEW
          Severity: Normal
          Priority: Other
         Component: Appender
        AssignedTo: log4j-dev@logging.apache.org
        ReportedBy: erik@spectacle.ca


The ConsoleAppender can be configured to log messages to Standard Out or
Standard Error.

Both of these streams may be redirected using System.setErr and System.setOut.

In the current implementation, a Console appender stores a reference to it's
destination stream when it is initially configured and will continue to use that
reference unless it is reconfigured. As a result, a ConsoleAppender will
continue to log to the old stdout/stderr destination even after the system
stream has been redirected.

Since log4j may be automatically configured very early in the application
lifecycle (in the case of my project, due to a call to Logger.getLogger in a
static member initialization), it can be difficult or impossible to be sure that
any necessary redirection takes place before log4j initialization.

My patch proposes a solution to this problem. The modified ConsoleAppender
overrides the AppenderSkeleton.append( LoggingEvent ) method to verify that the
system's stream has not changed since it was last configured. If it has changed,
the ConsoleAppender updates itself to use the new reference.

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