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https://issues.apache.org/jira/browse/LOG4J2-3359?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17480702#comment-17480702
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Ralph Goers commented on LOG4J2-3359:
-------------------------------------
This builder is doing the wrong thing when provided with a Layout. A syslog
appender should always use the SyslogLayout since the header always has to be
present. If another layout is provided it only applies to the message text that
appears after the header. The current code is replacing the SyslogLayout with
the provided Layout.
Log4j-core's SyslogLayout doesn't accept a PatternLayout or a pattern. I don't
think I would want it to accept a Layout. So I would recommend we copy the
SyslogLayout into log4j-1.2-api and modify it to accept the layout and only use
it to generate the message.
> Facility and priority missing in Syslog message when Syslog log appender and
> pattern layout is used with log4j1-2 bridge API
> -----------------------------------------------------------------------------------------------------------------------------
>
> Key: LOG4J2-3359
> URL: https://issues.apache.org/jira/browse/LOG4J2-3359
> Project: Log4j 2
> Issue Type: Bug
> Components: Appenders
> Environment: This issue is reproducible with log4j-2.17.1 &
> log4j-2-17-2
> JDK 1.8
> -Dlog4j1.compatibility=true
> log4j.properties file :-
> log4j.rootLogger=DEBUG,SYSLOG
> log4j.appender.SYSLOG=org.apache.log4j.net.SyslogAppender
> log4j.appender.SYSLOG.Threshold=DEBUG
> log4j.appender.SYSLOG.SyslogHost=localhost:514
> log4j.appender.SYSLOG.protocol=UDP
> log4j.appender.SYSLOG.Facility=LOCAL1
> log4j.appender.SYSLOG.layout=org.apache.log4j.PatternLayout
> log4j.appender.SYSLOG.layout.ConversionPattern=${hostName} MyMain[%pid] :%t:
> %c %-4p - %m%n
> Reporter: Tukesh
> Assignee: Gary D. Gregory
> Priority: Blocker
> Attachments: LoggerExample.java, bug_fac_pri.pcapng,
> bug_fac_pri2.pcapng.pcap, log4j.properties
>
>
> FACILITY and PRIORITY is not included when log4j bridge API sends SysLog
> message. Please find the attached pcap files.
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