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Posted to log4j-dev@logging.apache.org by bu...@apache.org on 2006/09/01 19:14:44 UTC
DO NOT REPLY [Bug 40382] - Sysappender hangs during boot time on HP
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------- Additional Comments From carnold@apache.org 2006-09-01 17:14 -------
SyslogAppender in log4j is implemented as a pure Java class using network IO (even when logging to
localhost) and does not call the ::syslog native method. The implementation has the advantage of
being platform independent, but will not work if syslogd is not accepting network connections or if the
security manager prevents the creation of sockets. There is a enhancement request for a JNI
implementation of SyslogAppender (http://issues.apache.org/bugzilla/show_bug.cgi?id=27363) along
with an implementation.
It is likely that you are running into one of the blockers mentioned (at least in the start up phase). How
that affect system booting is unclear. I'm guessing that if you change your config file to use another
appender (for example, ConsoleAppender), then you start up process would work fine. The exception
thrown when trying to connect to syslogd seems to be caught properly, but perhaps instead of
subsequent log requests failing, they block somehow.
I've reviewed both the log4j 1.2 and 1.3 implementations and don't see a mechanism for logging after
the observed warning to cause a lock up. this.ds should be null and the write methods in SyslogWriter
do check that and though they unnecessary create DatagramPackets, they do not attempt to send them.
The code could be optimized by avoiding short-circuiting the write statements if this.ds == null.
Perhaps the lock up is due to something else in the app and is not related to the SyslogAppender.
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