question: private Log discoverLogImplementation ( String logCategory ) throws LogConfigurationException { if ( isDiagnosticsEnabled ( ) ) { logDiagnostic ( "Discovering a Log implementation..." ) ; } initConfiguration ( ) ; Log result = null ; String specifiedLogClassName = findUserSpecifiedLogClassName ( ) ; if ( specifiedLogClassName != null ) { if ( isDiagnosticsEnabled ( ) ) { logDiagnostic ( "Attempting to load user-specified log class '" + specifiedLogClassName + "'..." ) ; } result = createLogFromClass ( specifiedLogClassName , logCategory , true ) ; if ( result == null ) { StringBuffer messageBuffer = new StringBuffer ( "User-specified log class '" ) ; messageBuffer . append ( specifiedLogClassName ) ; messageBuffer . append ( "' cannot be found or is not useable." ) ; if ( specifiedLogClassName != null ) { informUponSimilarName ( messageBuffer , specifiedLogClassName , LOGGING_IMPL_LOG4J_LOGGER ) ; informUponSimilarName ( messageBuffer , specifiedLogClassName , LOGGING_IMPL_JDK14_LOGGER ) ; informUponSimilarName ( messageBuffer , specifiedLogClassName , LOGGING_IMPL_LUMBERJACK_LOGGER ) ; informUponSimilarName ( messageBuffer , specifiedLogClassName , LOGGING_IMPL_SIMPLE_LOGGER ) ; } throw new LogConfigurationException ( messageBuffer . toString ( ) ) ; } return result ; } if ( isDiagnosticsEnabled ( ) ) { logDiagnostic ( "No user-specified Log implementation; performing discovery" + " using the standard supported logging implementations..." ) ; } for ( int i = 0 ; ( i < classesToDiscover . length ) && ( result == null ) ; ++ i ) { result = createLogFromClass ( classesToDiscover [ i ] , logCategory , true ) ; } if ( result == null ) { throw new LogConfigurationException ( "No suitable Log implementation" ) ; } return result ; }
target:  Attempts to create a Log instance for the given category name. Follows the discovery process described in the class javadoc.