Re: logging inside EJB

[Robert Pepersack]

Here's how I did it.

// QueryBean.java

package miaJ2ee.ejb.server;

import java.util.ArrayList;

import javax.ejb.SessionBean;
import javax.ejb.SessionContext;
import miaJ2ee.data.common.DataTransferObject;
import miaJ2ee.ejb.client.QueryException;
import miaJ2ee.dao.DataAccessObjectFactory;
import org.apache.log4j.Logger;
import org.apache.log4j.PropertyConfigurator;
/**
 * QueryBean is the bean class for a stateless
 * session bean.
 */
public class QueryBean implements SessionBean
{
    /**
     * Logger for this class.
     */
    private static final Logger logger =
            Logger.getLogger("miaJ2ee.ejb.server.QueryBean");
    /**
     * Info indicator for this class.
     */
    private final boolean info = logger.isInfoEnabled();
    public SessionContext context;

    public void ejbActivate(){}
    public void ejbPassivate(){}
    public void ejbRemove(){}
    public void ejbCreate()
    {
        PropertyConfigurator.configure("miaJ2ee.properties");
    }
    public void setSessionContext(SessionContext ctx)
    {
        context = ctx;
    }
    /**
     * Get a DataTransferObject from the database.
     */
    public DataTransferObject getObject(DataTransferObject data)
    throws QueryException
    {
        if (this.info)
        {
            logger.info("getObject() -- " +
                        "Creating data access object by calling " +
                        "DataAccessObjectFactory.createDao()...");
        }
        try
        {
            return 
DataAccessObjectFactory.createDao(data.getType()).getObject(data);
        }
        catch (Exception e)
        {
            throw new QueryException(e);
        }
    }

    /**
     * Get an ArrayList of DataTransferObjects from the database.
     */
    public ArrayList getObjectList(DataTransferObject data)
    throws QueryException
    {
        if (this.info)
        {
            logger.info("getObjectList() -- " +
                        "Creating data access object by calling " +
                        "DataAccessObjectFactory.createDao()...");
        }
        try
        {
            return 
DataAccessObjectFactory.createDao(data.getType()).getObjectList(data);
        }
        catch (Exception e)
        {
            throw new QueryException(e);
        }
    }

}

My EJB container is Sybase EAServer, so I had to write a custom appender 
that writes to my server's log file.

At 03:35 PM 04/19/2004 -0400, you wrote:
Hi, I am trying to put logger inside a stateless session bean, like

public class LegacyServiceBean implements SessionBean{
        private Logger logger = Logger.getLogger(LegacyServiceBean.class);
}
When I use IBM's AAT(version 4.00.032) to assemble the ear for OS390,
I got the following warning,
/J2EE1DOT2AppEJB.jar(Field: class$0, Class:
LegacyServiceBean: CHKJ2200W: The field is static but not final. Read
section 18.1.2 of the EJB 1.1 specification.
I did not spend much on studying this, I am sure other peoples should have
encoutered this.
What is the correct way to use log4j inside EJB?

Thanks,

Bosheng

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