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Servlet.service() for servlet jsp threw exception
java.lang.ExceptionInInitializerError
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import java.util.HashMap;
import java.util.ResourceBundle;
import java.sql.*;
import org.apache.log4j.*;

public class MenuManager
{

    private static MenuManager instance=new MenuManager();

    private String bookname,bookurl;
    private String sql;
    
    private HashMap menus=new HashMap();

1.  private static Logger log=Logger.getLogger(MenuManager.class.getName());
    
    private MenuManager()
    {

        Menu root=new Menu("/","index.jsp");

2.        PropertyConfigurator.configure("MenuManagerLog.properties");
3.        log.setLevel((Level)Level.DEBUG);
        .......
        .......
        sql="select "+booknamefield+","+bookurlfield+" from "+table;
4.        log.debug(sql);
        try
        {
        .......
        }
        catch(Exception e)
        {
5.            log.debug(e.getMessage());
        }
        menus.put("main",root);
    }
    .......
}

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MenuManagerLog.properties

log4j.rootLogger=DEBUG, A1
log4j.appender.A1=org.apache.log4j.DailyRollingFileAppender
log4j.appender.A1.file=MenuManagerLog.txt
log4j.appender.A1.DatePattern='.'yyyy-MM-dd
log4j.appender.A1.layout=org.apache.log4j.PatternLayout
log4j.appender.A1.layout.ConversionPattern=[%-5p] %d{yyyy-MM-dd HH:mm:ss,SSS} method:%l%n%m%n

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