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From: Yair Ogen <yairogen@gmail.com>
Date: Sun, 21 Jun 2009 12:07:41 +0300
Message-ID: <a44e15a30906210207j1e0b1d03g3d372588ad8a2bc9@mail.gmail.com>
Subject: Re: Changing log4j configuration runtime ...
To: Log4J Users List <log4j-user@logging.apache.org>
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Why not use a regular property file?

Then when you to update the file you can load the changes automatically
using the "PropertyConfigurator.configureAndWatch" mechanism.


On Sun, Jun 21, 2009 at 11:41 AM, Preetam Palwe <preetamp@aftek.com> wrote:

> Hello all,
>
>
>
> I have successfully configured log4j in my standalone java application
> using PropertyConfigurator.configure()
>
> Here is the configuration file
>
>
>
> log4j.rootLogger=DBUG, LogFile
>
>
>
> log4j.logger.com.server.core=INFO
>
> log4j.logger. com.server.core.SecurityManager =DEBUG
>
> log4j.logger. com.server.core.SecurityPatternsCreator =DEBUG
>
>
>
>
> log4j.appender.LogFile=org.apache.log4j.RollingFileAppender
>
>                log4j.appender.LogFile.File=c:/server.log
>
>                log4j.appender.LogFile.MaxFileSize=5MB
>
>                log4j.appender.LogFile.MaxBackupIndex=10
>
>
> log4j.appender.LogFile.layout=org.apache.log4j.PatternLayout
>
>                log4j.appender.LogFile.layout.ConversionPattern=%d{yyyy
> MM dd HH:mm:ss:SSS}# [%-5p]# [%t]# %c# %C{1}.%M# %m%n
>
>
>
> In case of my application I have a security related library
> (securitylib.jar) in which there we do some is a critical security
> related processing. And I want to set logging level of "INFO" to all the
> classes/loggers from this jar.
>
> The log4j configuration is done before loading securitylib.jar using
> above configuration file.
>
> When securitylib.jar is loaded I tried to re-configure log4j using
> following code.
>
> (what I have done here is removed all the explicit loggers set in
> configuration file, updated the configuration properties and configured
> logger again)
>
>
>
> But when I test the system I am still able to see the DEBUG logs for
> classes/loggers com.server.core.SecurityManager and
> com.server.core.SecurityPatternsCreator (which I had marked as DEBUG in
> config files)
>
>
>
> My questions are ...
>
> 1.       Why after reconfiguring the loggers the new configuration is
> not getting reflected ?
>
> 2.       Is there any way to get the current log4j configuration and
> change it at runtime ?
>
>
>
> Thanks in advance for your help!
>
> ~PP
>
>
>
> private void reinitLog4j()
>
>    {
>
>                try
>
>                {
>
>                    String log4jFile = System.getProperty("log4j.file");
>
>                    Properties properties = new Properties();
>
>                    properties.load(new FileInputStream(log4jFile));
>
>                    updateLoggingConfiguration(properties);
>
>                    PropertyConfigurator.configure(properties);
>
>                }
>
>                catch (IOException ioEx)
>
>                {
>
>                    throw new RuntimeException("failed to reconfigure
> logger "
>
>                                    + ioEx.getMessage(), ioEx);
>
>                }
>
>                logger = Logger.getLogger(this.getClass());
>
>                logger.info("Log4j RE initialised to use INFO logs
> everywhere !");
>
>                logger.debug("THIS SHOULD NEVER COME IN LOGS");
>
>    }
>
>
>
>    private void updateLoggingConfiguration(Properties properties)
>
>    {
>
>                for (Iterator iterator =
> properties.entrySet().iterator(); iterator
>
>                                .hasNext();)
>
>                {
>
>                    Entry entry = (Entry) iterator.next();
>
>                    String key = (String) entry.getKey();
>
>                    if (key.equalsIgnoreCase("log4j.rootLogger"))
>
>                    {
>
>
> entry.setValue(getRootLoggerConfiguration((String) entry
>
>                                                .getValue()));
>
>                    }
>
>                    else if (key.startsWith("log4j.logger"))
>
>                    {
>
>                                iterator.remove();
>
>                    }
>
>                }
>
>    }
>
>
>
>    private String getRootLoggerConfiguration(String currentConfig)
>
>    {
>
>                String[] tokens = IOUtil.tokenizeString(currentConfig,
> ",");
>
>                StringBuilder builder = new StringBuilder();
>
>                for (int i = 0; i < tokens.length; i++)
>
>                {
>
>                    if (i == 0)
>
>                    {
>
>                                builder.append("INFO");
>
>                                continue;
>
>                    }
>
>                    builder.append(", " + tokens[i]);
>
>                }
>
>                return builder.toString();
>
>    }
>
>
>
>
>
>
>
>

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