log4j and struts

[kaswanharish]

Hi,
I am using log4j with struts, all configuration is working fine but now I have a requirement to read log4j xml param values using database here is example what i want
<appender name="debugfile"
class="org.apache.log4j.RollingFileAppender">
<param name="maxFileSize" value="**this i want from database
<param name="maxBackupIndex" value=" **this i want from database
<param name="File" value="**this i want from database

please help me out

Thanks in advance !!

[travishein]

I imagine to do this,
- have the log4j.xml file generated, such as having a java process run before your application, to connect to the database, populate the value, perhaps by replacing a token in a template and writing out the log4j,xml file, then starting your application up, which would conveniently now find this generated log4j.xml in its classpath.

- use the programmatic API to configure the log4j. See the log4j java API documentation, where you might do something like

String filename = "thefilename";
Layout layout = new PatternLayout(...);
RollingFileAppender appender = new RollingFileAppender(layout, filename);
int maxFileSize = // this is where you invoke your database query to get the value to use.
appender.setMaxFileSize(maxFileSize);

// and make this appender be used 
Logger logger = Logger.getRootLogger();
logger.removeAllAppenders();
logger.addAppender(appender);

I think this hybrid reconfiguration would allow the logger settings and levels defined in the log4j.xml to still work. Maybe you would not need to remove all existing appenders first.

[kaswanharish]

Travishein thanks for Reply !!

:confused::confused:
I want to chang log4j.xml based on user login !!
suppose if type A user login then I want different log4j configuration and if type B user login then I want different log4j configuration .....
is it possible for me ?? :rolleyes::rolleyes:

Thanks again for reply

[travishein]

im not sure if this is possible directly with log4j. you would need to write a custom appender that is somehow aware of who the user who invoked it is. It might be possible with something more modern like logback project, but i have not really looked into this.