Comments on: Log4J Runtime Configuration

By: Change log4j loglevels runtime | Iamkristian

Change log4j loglevels runtime | Iamkristian — Wed, 27 Apr 2011 12:13:10 +0000

[...] “Nelz” Carpentier posted this piece of jsp – listed here below, that enables you to change the log4j loglevel runtime, instead of [...]

By: Anonymous

Anonymous — Fri, 07 Jan 2011 07:46:09 +0000

Thanks for this script!

To make it work wherever you want to put it, add the following line at the beginning somewhere and replace the hardcoded “log4jAdmin.jsp” strings with it:

String servletLocation = request.getContextPath() + request.getServletPath();

By: Ulrik Skyt

Ulrik Skyt — Fri, 20 Aug 2010 09:11:38 +0000

Nice script!

I found it useful to add a “Reset Configuration” button, which invokes this code before the rest of the code:

if (“resetConfiguration”.equals(targetOperation)) {
LogManager.resetConfiguration();
URL url = Loader.getResource(“log4j.xml”);
DOMConfigurator.configure(url);
}

By: Nelz

Nelz — Tue, 09 Sep 2008 22:42:01 +0000

Jon and Sudheer, thank you for your help. I have updated the code with your suggestions.

By: Sudheer

Sudheer — Tue, 05 Aug 2008 17:54:01 +0000

Its a Nice and useful script.
However I ran into a small issue.
Attempting to change the log level on the filtered result set, is not working.
Its becuase of the missing ‘LogFilterType’ parameter in the links.
To fix it, Change the URL part (Line 139) as follows:
Change From:
String url = “/log4jAdmin.jsp?operation=changeLogLevel&logger=” + loggerName + “&newLogLevel=” + logLevels[cnt] + “&logNameFilter=” + (logNameFilter != null ? logNameFilter : “”);
Change To:
String url = “/log4jAdmin.jsp?operation=changeLogLevel&logger=” + loggerName + “&newLogLevel=” + logLevels[cnt] + “&logNameFilter=” + (logNameFilter != null ? logNameFilter : “”) + “&logNameFilterType=” + (logNameFilterType != null ? logNameFilterType : “”);
(Add the param “logNameFilterType” in the query string)

By: Jon Mann

Jon Mann — Thu, 10 Apr 2008 02:05:23 +0000

Thanks, that is very useful.
There are 2 hard-coded URLs in the page:
1. “/admin/log4j.do” (line #51)
2. “/log4jAdmin.jsp” (line #140)
After changing both of these, the JSP worked perfectly.