[slf4j-user] Sigar and log4j-over-slf4j

[David Alves]

Hi 

	I'm using Sigar (native system metrics gathering API) with log4j-over-slf4j and it crashed on start with: 

	java.lang.NoSuchMethodError: org.apache.log4j.Logger.getAllAppenders()Ljava/util/Enumeration;
	at org.hyperic.sigar.SigarLog.isLogConfigured(SigarLog.java:40)
	at org.hyperic.sigar.SigarLog.getLogger(SigarLog.java:49)
	at org.hyperic.sigar.SigarLog.getLogger(SigarLog.java:44)
	at org.hyperic.sigar.SigarLog.debug(SigarLog.java:60)
	at org.hyperic.sigar.Sigar.<clinit>(Sigar.java:108)
	...

	This because the Category class  in log4j-over-slf4j (from whom Logger descends) does not contain the getAllAppenders() method which is a known and somewhat used hack to test wether log4j was initialized.
	I got the project from git and added this mock method to the Category class:

	public Enumeration getAllAppenders() {
    return new Enumeration() {
      public Object nextElement() {
        return null;
      }
      public boolean hasMoreElements() {
        return false;
      }
    };
  }

	All works fine now. It would be cool if the main version would support this.
	Btw nice work on slf4j. Got to love open source :))

Regards
David Alves
	
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