Zilong Song created LOG4J2-1561:
-----------------------------------
Summary: print expected mdc info to each line of the exception
stacktrace
Key: LOG4J2-1561
URL: https://issues.apache.org/jira/browse/LOG4J2-1561
Project: Log4j 2
Issue Type: Improvement
Components: Core
Affects Versions: 2.6.2
Environment: OS X EI Caption, Java 1.7
Reporter: Zilong Song
Priority: Minor
Fix For: 2.6.2
In some applications we need to append certain MDC information to each line of
logs for a certain process, so that we can easily distinguish them from other
logs, and further analysis them. But currently this information cannot be
appended to any line of the stack trace, so it's hard to get the lines of the
stack trace from massive lines. This issue will append this information to each
line of the stack trace.
An already known usage for this feature is that we can easily get all lines of
log for a certain process when we set an ID before the process starts.
The following is the code and configuration, and the effect of it.
code:
{code:java|title=Test.main()}
public static void main(String[] args) {
final Logger logger = LogManager.getRootLogger();
ThreadContext.put("proc_id", "1234567890");
Exception exception = new Exception("sample exception");
logger.info("an exception is logged", exception);
}
{code}
{code:xml|title=log4j2.xml|}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration status="warn" name="live-im">
<Appenders>
<Console name="console-log" target="SYSTEM_OUT">
<PatternLayout pattern="%d %p [%t] %C{2} (%F:%L) - %m
%X{proc_id}%n%cEx{proc_id}"/>
</Console>
</Appenders>
<Loggers>
<Root level="all">
<AppenderRef ref="console-log"/>
</Root>
</Loggers>
</Configuration>
{code}
{code:title=output}
2016-09-03 22:56:56,721 INFO [main] pattern.Test (Test.java:17) - an exception
is logged 1234567890
java.lang.Exception: sample exception 1234567890
at org.apache.logging.log4j.core.pattern.Test.main(Test.java:16)
[classes/:?] 1234567890
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
~[?:1.8.0_91] 1234567890
at
sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
~[?:1.8.0_91] 1234567890
at
sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
~[?:1.8.0_91] 1234567890
at java.lang.reflect.Method.invoke(Method.java:498) ~[?:1.8.0_91]
1234567890
at com.intellij.rt.execution.application.AppMain.main(AppMain.java:144)
[idea_rt.jar:?] 1234567890
{code}
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