[Neo4j] Log message for unmanaged extension

[Brendan cheng]

Hi,
I tried to debug my unmanaged extension with 
private static final Logger log = Logger.getLogger(Register.class);
and
generate a message like:
log.warn("passed check point 1");
But I couldn't find any these messages from any log files, neo4j.0.0.log, 
console.log, message.log...etc
How should I setup the log message?
Regards,
Brendan                                           
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