I use Spring BlazeDS Integration version 1.5.0 and BlazeDS version 4.0.0. I found that it could not logging with SLF4J component. So, i found same solutions from internet, as follows:
package com.omm;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import flex.messaging.log.AbstractTarget;
import flex.messaging.log.LogEvent;

public class Slf4jTarget extends AbstractTarget
{
/** {@inheritDoc} */
@Override
public void logEvent(LogEvent event)
{
Logger logger = LoggerFactory.getLogger(event.logger.getCategory() );

if (event.level >= LogEvent.ERROR)
{
logger.error(event.message, event.throwable);
}
else if (event.level >= LogEvent.WARN)
{
logger.warn(event.message, event.throwable);
}
else if (event.level >= LogEvent.INFO)
{
logger.info(event.message, event.throwable);
}
else if (event.level >= LogEvent.DEBUG)
{
logger.debug(event.message, event.throwable);
}
else
{
logger.trace(event.message, event.throwable);
}
}
}

Does Spring have the plane to resolve it ?