#26 Ostream appende writes duplicated output

[Paco Avila]

When I use log4cpp 0.2.7 and use this code, the
OstreamAppender writes twice to stdout:

#include <iostream>
#include <log4cpp/Category.hh>
#include <log4cpp/Appender.hh>
#include <log4cpp/OstreamAppender.hh>

using namespace std;
using namespace log4cpp;

int main(int argc, char **argv) {
log4cpp::Appender* appender = new OstreamAppender
("default", &std::cout);
appender->setLayout(new BasicLayout());
Category& root = Category::getRoot();
root.setAppender(appender);
root.setPriority(Priority::DEBUG);
Category& log = Category::getInstance("main");

log.debug("Esto es desde DEBUG");
log.warn("Esto es desde WARN");

return 0;
}

This code was running ok in 0.2.6. I'm missing any new
and amazing feature?

Thanks in advance.

[Bastiaan Bakker]

Logged In: YES
user_id=8050

Hmm, this is a bug^H^H^Hfeature introduced by the multiple
Appender support for Categories: setAppender() calls
addAppender but does not remove any existing Appenders. As a
workaround you could call removeAllAppenders() before
setAppender() or addAppender() or include it in the
setAppender method itself.
For a proper fix we need to do more: if the Appender we want
to set already has been added to the Category we have to
make sure removeAllAppenders() will not delete it.

Thanks,

Bastiaan