Hi Ceki,

The method in question is this:

public void log(String FQCN, Priority p, Object msg, Throwable t) {
    int levelInt = priorityToLevelInt(p);
    if (locationAwareLogger != null) {
locationAwareLogger.log(null, FQCN, levelInt, convertToString(msg), t);
    } else {
      throw new UnsupportedOperationException("The logger [" + slf4jLogger
          + "] does not seem to be location aware.");
    }
  }

You are right: I only saw this when the logger was the NOPLogger. I saw the UnsupportedOperationException shown in that method was thrown.

What I'm suggesting is that the NOPLogger should implement LocationAwareLogger, since I don't see any value in having the NOPLogger stop a log from happening...

Thanks,
Seth

On 2/22/10 12:45 AM, Ceki Gulcu wrote:
Hello Seth,


Reading the code of the Category class in log4j-over-slf4j, it appears
that both loggers of type org.slf4j.Logger *and* LocationAwareLogger
are supported. Category class in log4j-over-slf4j should throw an
exception if the slf4j logger it gets is of type NOPLogger. Can you
show the exception you are observing?

Cheers,

On 22.02.2010 01:57, ownedthx wrote:

Hi all,

I'm using a logback appender which logs during startup, causing a NOPLogger
to be created while the underlying library initializes.

In this specific scenario, I'm coercing a 3rd-party library out of direct
log4j usage by using the log4j-over-slf4j bridge.  However, the
Category.java implementation in the bridge will throw an exception if the
underlying logger (in this case, NOPLogger) does not implement the
LocationAwareLogger interface.

This seems wrong to me--seems to me the NOPLogger should implement
LocationAwareLogger, and NOP the log statement specific to that, just like it does with all the other various log overloads it implements, instead of
causing the appender to fail to start.

Any thoughts on this?

By the way, I did stop the error by doing just what was recommended here...

Thanks,
Seth



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