[jira] [Created] (LOG4J2-3410) Log4j 1.x Compatibility API - ClassCastException when logging MultiKeyMap

["Barry Sham (Jira)" <ji...@apache.org>]

Barry Sham created LOG4J2-3410:
----------------------------------

             Summary: Log4j 1.x Compatibility API - ClassCastException when logging MultiKeyMap
                 Key: LOG4J2-3410
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3410
             Project: Log4j 2
          Issue Type: Bug
          Components: Log4j 1.2 bridge
    Affects Versions: 2.17.1, 2.13.0
         Environment: OS: Windows 10 Enterprise 64bit

Java version: zulu8.31.0.1-jdk8.0.181-win_x64{*}{*}
            Reporter: Barry Sham


Our existing business logic contains a debug message which print out a {_}org.apache.commons.collections.map.MultiKeyMap{_}:

 
{code:java}
MultiKeyMap prnMap = MultiKeyMap.decorate(new LinkedMap());
prnMap.put("0", "1", "2");
logger.debug(prnMap);
{code}
 

in {*}log4j-1.2-api 2.12.4{*}, it can be print out {color:#4c9aff}properly{color}:

 
{code:java}
{MultiKey[0, 1]=2}{code}
 

However it becomes an {color:#FF0000}ClassCastException {color}+since *2.13.0* (including the latest {*}2.17.1{*})+
{code:java}
Exception in thread "main" java.lang.ClassCastException: org.apache.commons.collections.keyvalue.MultiKey cannot be cast to java.lang.String
    at org.apache.logging.log4j.util.SortedArrayStringMap.<init>(SortedArrayStringMap.java:154)
    at org.apache.logging.log4j.message.MapMessage.<init>(MapMessage.java:125)
    at org.apache.log4j.Category.maybeLog(Category.java:507)
    at org.apache.log4j.Category.debug(Category.java:243)
    at sideproject.sideproject.App.proeces(App.java:25)
    at sideproject.sideproject.App.main(App.java:17){code}
As the map can print out using *System.out* +without issue,+ we are wondering if it is a bug in Apache Log4j 1.x Compatibility API

A GitHub Project is prepared for reference: [shin779/log4j-multikeymap (github.com)|https://github.com/shin779/log4j-multikeymap]



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