Filipp Gunbin created LOG4J2-2636:
-------------------------------------
Summary: 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
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:
{{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)
}}
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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