> I use standard static code to include the log4j configuration:
>
> static {
> PropertyConfigurator.configure("file"));
> }
>
> But this code is not always executed, depending on if the class in which
> this is included particpates in execution. But if I add this statment to
> other classes too,
> I sooner or later get double-messages as two classes with this statement
> are used. Then I need to manually remove the code in one of them to
> achieve proper logging.
>
> How this is done right? I just want to have this configuration stated
> once and applicable to the whole project.
Hi Sebastian,
What I tend to do is have a class to do something similar but first check
whether already configured: my class is called LogConfigureCheck and is used in
a static block for all my JUnit tests thus...
static {
LogConfigureCheck.check();
}
...and here follows a version of the class suitable for redistribution.
Enjoy,
Michael Erskine
import org.apache.log4j.ConsoleAppender;
import org.apache.log4j.Logger;
import org.apache.log4j.PatternLayout;
/**
* Occasionally we find a JUnit test suite or test case class that tests classes
* that use log4j but for whatever reason log4j is not configured. We want to
* avoid log4j being configured multiple times as this adds its own problems!
* The aim here is to enforce that log4j is configured once and only once with
* typical but useful features.
*
* @author Michael Erskine (msemtd)
*/
public class LogConfigureCheck {
public static void check() {
// One indicator of log4j not being configured is the lack of appenders
// for the root logger. So...
if (!Logger.getRootLogger().getAllAppenders().hasMoreElements()) {
// Here we could just use BasicConfigurator.configure()
// but the layout is not as useful as it could be - here we do
// essentially the same but with a better layout...
Logger.getRootLogger().addAppender(
new ConsoleAppender(new PatternLayout(
"%-5p %d{HH:mm:ss.SSS} %c [%t] %m%n")));
}
}
}
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