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https://issues.apache.org/jira/browse/LOG4J2-2636?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Ralph Goers updated LOG4J2-2636:
--------------------------------
Fix Version/s: 2.16.0
(was: 2.15.0)
> No default value for mdcId in SyslogAppender
> --------------------------------------------
>
> Key: LOG4J2-2636
> URL: https://issues.apache.org/jira/browse/LOG4J2-2636
> Project: Log4j 2
> Issue Type: Bug
> Affects Versions: 2.11.2
> Reporter: Filipp Gunbin
> Priority: Major
> Fix For: 2.16.0
>
>
> 1) Main issue
> When Rfc5424Layout is created from configuration, it seems to receive default
> value:
> {code:java}
> @PluginAttribute(value = "mdcId", defaultString = DEFAULT_MDCID) final String
> mdcId,{code}
> But SyslogAppender has it with no default:
> {code:java}
> @PluginBuilderAttribute("mdcId")
> private String mdcId;{code}
> It is used in SyslogAppender.build() to create Rfc5424Layout. So, if I don't
> specify "mdcId" attribute in <Syslog>" config element, I get this exception:
> {quote}ERROR StatusLogger Could not create plugin of type class
> org.apache.logging.log4j.core.appender.SyslogAppender for element Syslog:
> java.lang.IllegalArgumentException: No structured id name was supplied
> java.lang.IllegalArgumentException: No structured id name was supplied at
> org.apache.logging.log4j.message.StructuredDataId.<init>(StructuredDataId.java:146)
> at
> org.apache.logging.log4j.message.StructuredDataId.<init>(StructuredDataId.java:130)
> at
> org.apache.logging.log4j.core.layout.Rfc5424Layout.<init>(Rfc5424Layout.java:142)
> at
> org.apache.logging.log4j.core.layout.Rfc5424Layout.createLayout(Rfc5424Layout.java:672)
> at
> org.apache.logging.log4j.core.appender.SyslogAppender$Builder.build(SyslogAppender.java:117)
> at
> org.apache.logging.log4j.core.appender.SyslogAppender$Builder.build(SyslogAppender.java:50)
> {quote}
> 2) Documentation doesn't mention mdcId of SyslogAppender at all:
> [https://logging.apache.org/log4j/2.x/manual/appenders.html#SyslogAppender]
> If I build site locally with "mvn site" in 2.11.2, it's not there either.
> 3) Commit ce1183629fe89625a77872c7153853e7774502a6
> (https://issues.apache.org/jira/browse/LOG4J2-922) which introduces default
> value for mdcId in Rfc5424Layout has this code:
> {code:java}
> this.mdcId = id == null ? DEFAULT_MDCID : id;
> this.mdcSdId = new StructuredDataId(mdcId, enterpriseNumber, null,
> null);{code}
> While "this.mdcId" is set in first line, the argument (not class member)
> mdcId is used in the second line. Maybe argument mdcId should be used in the
> first line instead of "id"? Maybe this.mdcId should be used in the second
> line instead of argument mdcId? I'm not familiar with the code enough to tell
> for sure, it just feels suspicious to me.
> Thanks.
>
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