[jira] [Created] (LOG4J2-3629) No properties lookup from JsonTemplateLayout pattern resolver?

["Tobias Gruetzmacher (Jira)" <ji...@apache.org>]

Tobias Gruetzmacher created LOG4J2-3629:
-------------------------------------------

             Summary: No properties lookup from JsonTemplateLayout pattern resolver?
                 Key: LOG4J2-3629
                 URL: https://issues.apache.org/jira/browse/LOG4J2-3629
             Project: Log4j 2
          Issue Type: Bug
          Components: JsonTemplateLayout
    Affects Versions: 2.19.0
            Reporter: Tobias Gruetzmacher


This is a slightly similar issue to LOG4J2-3367:

I want to be able to "share" some pattern settings between a line-based logger and a JSON logger, so I created a naive config like this:

 

*log4j2.xml*
{code:java}
<?xml version="1.0" encoding="UTF-8"?>
<Configuration name="Demo" status="debug" monitorInterval="60">
  <Properties>
    <Property name="exFilters">org.junit,org.apache.maven,sun.reflect,java.lang.reflect</Property>
    <Property name="exPattern">%xEx{filters(${exFilters})}</Property>
    <Property name="logPattern">%d{ISO8601} %-5p [%c{1}] %m%n${exPattern}</Property>
  </Properties>
  <Appenders>
    <Console name="Json">
      <JsonTemplateLayout eventTemplateUri="classpath:MyLayout.json" />
    </Console>
    <Console name="Plain">
      <PatternLayout pattern="${logPattern}" />
    </Console>
  </Appenders>
  <Loggers>
    <Root level="info">
      <AppenderRef ref="Json" />
      <AppenderRef ref="Plain" />
    </Root>
  </Loggers>
</Configuration>{code}
*MyLayout.json*
{code:java}
{
  "msg": {
    "$resolver": "message"
  },
  "thrown": {
    "stackTrace": {
      "$resolver": "pattern",
      "pattern": "${exPattern}"
    }
  }
} {code}
This doesn't work (probably because the lookup is only done at logging time, not at configuration time), but I'm wondering if this (or something similar) could be implemented somehow...

Yes, I'm aware that {{ExceptionResolver }}provides something similar, but it's not quite the same as the {{%xEx}} pattern, which seems to be a lot more customizable...



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