If you try to use JBoss Logging 3 in EAP 5.1 you get

Caused by: java.lang.NoSuchMethodError: org.jboss.logmanager.LogContext.getAttachment(Ljava/lang/String;Lorg/jboss/logmanager/Logger$AttachmentKey;)Ljava/lang/Object;
at org.jboss.logging.JBossLogManagerProvider.doGetLogger(JBossLogManagerProvider.java:52)
at org.jboss.logging.JBossLogManagerProvider.getLogger(JBossLogManagerProvider.java:47)
at org.jboss.logging.Logger.getLogger(Logger.java:2164)
at org.jboss.logging.Logger.getLogger(Logger.java:2189)

As the LogManager is too old. We should add a provider for older versions of LogManager