I had a couple questions regarding the following code which is included in a
weblogic sample application:
/**
* <p>Controls Log4j logging level. Implemented as a servlet so
* that logging levels can be adjusted by redeploying the webapp.
* Log file is determined by "log4j.config" set as a system
* property in the server startup file.</p>
*
* @author Copyright (c) 2003 by BEA Systems. All Rights Reserved.
*/
public class Log4jInit extends HttpServlet {
public void init() {
int debug = 0;
String value;
String logFile;
logFile = System.getProperty("log4j.config");
value = getServletConfig().getInitParameter("debug");
try {
debug = Integer.parseInt(value);
} catch (Throwable t) {
debug = 0;
}
if (debug >= 1) {
SimpleDateFormat formatter = new SimpleDateFormat("MMM d, yyyy H:mm:ss
a z");
Date today = new Date();
String output = "<"+formatter.format(today)+"> <Debug> <MedRec>";
System.out.println(output+" Patient app log4j prop file: "+logFile);
}
// if the log4j-init-file is not set, then no point in trying
if(logFile != null) {
if (logFile.toString().toLowerCase().endsWith(".xml")) {
DOMConfigurator.configure(logFile);
} else {
PropertyConfigurator.configure(logFile);
}
}
}
}
1. Does log4j need to be explicitly initialized this way? If the
log4j.properties or log4j.xml file is in the classpath, won't log4j
initialize itself?
2. This servlet gets a "debug" init parameter but never does anything
with it. How would you switch logging levels with this information. Can
you switch levels at runtime?
Thanks,
Joshua
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