[logback-user] strange MDC and SMTPAppender behavior

[Ceki Gulcu]

Hello Lucas,

Thank you for reporting this issue. I have created a jira entry for it:
http://jira.qos.ch/browse/LBCLASSIC-104

The issue has been solved in revision 2128.

Best regards,

Lucas, Casey wrote:
> I'm seeing unexpected behavior when I combine MDC and SMTPAppender.
> The MDC values appear to be lost for previous log messages when
> MDC.clear is called before Logger.error triggers the actual email.
> This does not appear to be a problem with console appender.  Below
> is a test program that will reproduce the problem.  A logback.xml
> that uses an SMTPAppender and a pattern that includes %mdc is required.
> 
> Is there something I'm missing?
> 
> Versions:
> 
> slf4j-api-1.5.6.jar
> logback-core-0.9.14.jar
> logback-classic-0.9.14.jar
> janino-2.5.14.jar
> mail-1.4.1.jar
> 
> java version "1.6.0_04"
> 
> 
> test program:
> 
> import org.slf4j.Logger;
> import org.slf4j.MDC;
> import org.slf4j.LoggerFactory;
> 
> public class TestMain
> {
> 
>     public static void main(String[] args)
>     {
>         Logger logger = LoggerFactory.getLogger("TestMain");
> 
> 
>         // test1...
>         logger.debug("test1: should not have MDC");
>         MDC.put("key1", "val1");
>         MDC.put("key2", "val2");
>         logger.warn("test1: should have MDC(key1=val1,key2=val2) but
> does not");
>         MDC.clear();
>         logger.debug("test1: should not have MDC");
>         logger.error("test1: error message triggers email");
> 
>         // test2...
>         logger.debug("test2: should not have MDC");
>         MDC.put("key1", "val1");
>         logger.warn("test2: should have MDC(key1=val1)");
>         MDC.put("key2", "val2");
>         logger.warn("test2: should have MDC(key1=val1,key2=val2)");
>         MDC.put("key3", "val3");
>         logger.warn("test2: should have
> MDC(key1=val1,key2=val2,key3=val3) but does not");
>         MDC.clear();
>         logger.debug("test2: should not have MDC");
>         logger.error("test2: error message triggers email");
> 
>         // test3...
>         logger.debug("test3: should not have MDC");
>         MDC.put("key1", "val1");
>         logger.warn("test3: should have MDC(key1=val1)");
>         MDC.put("key2", "val2");
>         logger.warn("test3: should have MDC(key1=val1,key2=val2)");
>         MDC.put("key3", "val3");
>         logger.warn("test3: should have
> MDC(key1=val1,key2=val2,key3=val3)");
>         MDC.put("key4", "val4");
>         logger.warn("test3: should have
> MDC(key1=val1,key2=val2,key3=val3,key4=val4) but does not");
>         MDC.clear();
>         logger.debug("test3: should not have MDC");
>         logger.error("test3: error message triggers email");
> 
>         // test4...
>         logger.debug("test4: should not have MDC");
>         MDC.put("key1", "val1");
>         logger.warn("test4: should have MDC(key1=val1)");
>         MDC.put("key2", "val2");
>         logger.error("test4: error message triggers email and has
> MDC(key1=val1,key2=val2)");
>         MDC.clear();
> 
>         logger.debug("test5: should not have MDC");
>         MDC.put("key1", "val1");
>         logger.warn("test5: should have MDC(key1=val1) but does not");
>         MDC.clear();
>         logger.debug("test5: should not have MDC");
>         MDC.put("key1", "val1");
>         logger.warn("test5: should have MDC(key1=val1)");
>         logger.error("test5: error message triggers email and should not
> have MDC");
>     }
> }
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> 

-- 
Ceki Gülcü
Logback: The reliable, generic, fast and flexible logging framework for Java.
http://logback.qos.ch