Genadi Saltikov created LOG4J2-2459:
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Summary: JsonLayout seems not to produce classname, line and
method
Key: LOG4J2-2459
URL: https://issues.apache.org/jira/browse/LOG4J2-2459
Project: Log4j 2
Issue Type: Bug
Components: Appenders, Layouts
Affects Versions: 2.11.1
Environment: Java 8
Reporter: Genadi Saltikov
When we use a JsonLayout such as:
{noformat}
<Kafka name="KafkaAppender" topic="topic1">
<JsonLayout compact="true">
<KeyValuePair key="service" value="some_app_tag"/>
<KeyValuePair key="@timestamp" value="${date:yyyy-MM-dd
HH:mm:ss.SSS}"/>
<KeyValuePair key="host_name" value="${hostName}"/>
<KeyValuePair key="unique_id" value="$${map:name:-NA}"/>
</JsonLayout>
<Property
name="bootstrap.servers">kafka1.com:9092,kafka2.com:9092,kafka3.com:9092</Property>
</Kafka>{noformat}
That only adds stuff like the message to the output JSON.
We tried various syntaxes to add \{{}}
{noformat}
%c{2}{noformat}
{{}}, {{}}
{noformat}
%M{noformat}
{\{ }}and \{{}}
{code:java}
%L{code}
In various syntax variations, but they all just output the literals and are not
being substituted.
The above placeholders do work in a Console Appender for example:
{noformat}
<Console name="ConsoleAppender" target="SYSTEM_OUT" follow="true">
<PatternLayout>
<!-- {Timestamp} {Log Level} [{Thread Name}] [Execution/Error Id]
{Class}.{Method}({FileName}:{Line}): {Message} /newline\ {Throwable/Exception}
-->
<pattern>%23.23d{yyyy-MM-dd HH:mm:ss.SSS} %5p [%t] [$${map:name:-NA}]
%c{1}.%M(%F:%L): %highlight{%m%n%throwable}</pattern>
</PatternLayout>
</Console>{noformat}
We are thinking it has to be a bug or something, if we get no other indication
we are going to try and work around this by re-implmenting the various log
method signatures (error, fatal, debug etc) and using something along the lines
of:
{code:java}
StringMapMessage mapMsg = new StringMapMessage();
mapMsg.put("method", "get the value somehow inside the custom logging
method implementation");
LOGGER.fatal(mapMsg);
{code}
Does that make sense?
This is the doc link we've been following, which seems not precise enough:
[https://logging.apache.org/log4j/2.x/manual/layouts.html#JSONLayout]
line, method etc are obviously outputted for an exception log with stack trace,
but not for a regular log message which does not contain some Exception based
object.
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