[jira] [Created] (LOG4J2-2664) log4j-1.2 compatibility layer seems to rely on log4j-core . It shouldn't

["Alexander Picoli (JIRA)" <ji...@apache.org>]

Alexander Picoli created LOG4J2-2664:
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             Summary: log4j-1.2 compatibility layer seems to rely on log4j-core . It shouldn't
                 Key: LOG4J2-2664
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2664
             Project: Log4j 2
          Issue Type: Bug
          Components: log4j 1.2 emulation
    Affects Versions: 2.12.0
            Reporter: Alexander Picoli


I've just got a surprise that was a showstopper to me: It seems that log4j 1.2 compatibility layer demands log4j core for working well:

In our project, we are trying to use another spi that wraps around log4j 2 , so that some specific features can be enforced.

However, when I try to use log4j 1.2 compatibility layer, it fails:

 

Exception in thread "main" java.lang.ClassCastException: com.ibm.is.poclog4j.commonconfig.MandatoryAppendersLoggerContext incompatible with org.apache.logging.log4j.core.LoggerContext
    at org.apache.log4j.Logger$PrivateManager.getContext(Logger.java:59)
    at org.apache.log4j.Logger.getRootLogger(Logger.java:45)
    at com.ibm.is.poclog4j.sample.SampleLogUser.main(SampleLogUser.java:9)

 

The issue is there: org.apache.logging.log4j.core.LoggerContext : you shouldn't count with a core-based context, or else you violate the API contract, forcing people to use a specific implementation for log4j (in this case, the default core one).

My SPI uses the spi-provided interface for LoggingContext: 
import org.apache.logging.log4j.spi.LoggerContext;

public class MandatoryAppendersLoggerContext implements LoggerContext {

 



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