Question

I’m writing a Flex app on top of a Java web application using BlazeDS. BlazeDS has logging inside of it, but I want to set it up to Use the same logging framework I have in my application.

Is there a way to setup BlazeDS to use Log4J? Or am I stuck with the Flex logging stuff that’s already baked into BlazeDS?

Answer 1

No, out of box BlazeDS does not support log4j or other frameworks directly.

However, it’s really simple to add support for your favourite logging framework; I used the following to get the output into SLF4J:

package example;  import org.slf4j.Logger; import org.slf4j.LoggerFactory;  import flex.messaging.log.AbstractTarget; import flex.messaging.log.LogEvent;  public class Slf4jTarget extends AbstractTarget {     // log4j levels:   OFF - FATAL - ERROR - WARN - INFO - DEBUG - TRACE - ALL     // blazeds levels:  NONE - FATAL - ERROR - WARN - INFO - DEBUG - ALL      @Override     public void logEvent(LogEvent event) {         Logger log = LoggerFactory.getLogger(event.logger.getCategory());          if (event.level >= LogEvent.ERROR)             log.error(event.message, event.throwable);         else if (event.level >= LogEvent.WARN)             log.warn(event.message, event.throwable);         else if (event.level >= LogEvent.INFO)              log.info(event.message, event.throwable);         else if (event.level >= LogEvent.DEBUG)              log.debug(event.message, event.throwable);         else              log.trace(event.message, event.throwable);     } } 

.. and to use it, enable it in services-config.xml:

<?xml version='1.0' encoding='UTF-8'?> <services-config>     <logging>         <target class='example.Slf4jTarget' level='Info'>     </logging> </services-config>