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Thursday, 16 September 2010

JDeveloper 11g:Using Log4j in an ADF application module

This is another concise instance for using Log4j in  an ADF application module, that is  in a  model project. The steps are quite similar:
starting with adding the log4j library, as shown in the image on your left hand side.
Next,  you need to create a log4j.properties file, within:

C:\...\Model\src

just  like the following:


# Set root logger level to INFO and its only appender to ConsoleOut.
log4j.rootLogger=INFO, ConsoleOut
# ConsoleOut is set to be a ConsoleAppender.
log4j.appender.ConsoleOut=org.apache.log4j.ConsoleAppender
# ConsoleOut uses PatternLayout.
log4j.appender.ConsoleOut.layout=org.apache.log4j.PatternLayout
log4j.appender.ConsoleOut.layout.ConversionPattern=%-5p: [%d] %c{1} - %m%n
log4j.logger.org.apache.jsp=DEBUG
#Addon for
com.sun.faces.level=FINE



Third, you need to edit your code just like that:

...

import org.apache.log4j.Logger;

...

public class TuhraServiceImpl extends TuhraApplicationModuleImpl implements TuhraService {

  private Logger logger = Logger.getLogger(this.getClass());

...

public void createNewImageForEmployee(Number employeeId, String imageName){

...
   if (logger.isDebugEnabled())
      logger.debug("New image has been created!");   

    }

}


Finally,  you should see your logger message appear in the log output window;


INFO : [2010-09-16 10:26:16,517] TuhraServiceImpl - New image has been created!

Would you like to refactor?

Moreover, you could move the code line below:


private Logger logger = Logger.getLogger(this.getClass());


 to the super class:


package tuhra.model.framework;
 

import oracle.jbo.server.ApplicationModuleImpl;
import org.apache.log4j.Logger;

public class TuhraApplicationModuleImpl extends ApplicationModuleImpl {

  protected Logger logger = Logger.getLogger(this.getClass().getName());

}



Once more, your custom  logger message should appear in the log output :


INFO : [2010-09-16 15:20:02,247] TuhraServiceImpl - New image has been created!

Finally, if you need more tips about appenders:
http://www.mobilefish.com/developer/log4j/log4j_quickguide_appenders.html