[jira] [Created] (LOG4J2-2708) JSON Layout incorrect for files

["David W. Urry (Jira)" <ji...@apache.org>]

David W. Urry created LOG4J2-2708:
-------------------------------------

             Summary: JSON Layout incorrect for files
                 Key: LOG4J2-2708
                 URL: https://issues.apache.org/jira/browse/LOG4J2-2708
             Project: Log4j 2
          Issue Type: Bug
          Components: Appenders
    Affects Versions: 2.12.1, 2.11.2, 2.11.1, 2.11.0
         Environment: Code sample to produce log message (in Scala)

 
{code:java}
   val map = new LinkedHashMap[String, String]()
    map.put("id", "3")
    map.put("event", "Performance")
    logger.info(map)
{code}

Scala 2.11
Log4J 2.11.0
Jackson 2.6.5
Run using Scala IDE (Eclipse Oxygen Build id: 4.7.0-vfinal-2017-09-29T14:34:02Z-Typesafe)

Configured using Log4J2.xml as follows:

 
{code:java}
...
<File name="Performance" fileName="logs/performance.log">
    <JsonLayout complete="true" compact="false"> </JsonLayout>
    <MapFilter onMatch="ACCEPT" onMismatch="DENY">
        <KeyValuePair key="id" value="3"/>
    </MapFilter>
</File>
...
{code}
Note that this breaks the map filter because no key can be found in the message which is interpreted as a string.  However, more importantly, it breaks the usefulness of supporting JSON in Log4j because the JSON format is broken meaning the log file can not be read by a JSON parser.

 
            Reporter: David W. Urry
         Attachments: performance.log

Log4j quotes the JSON message when put in a file.  Console output is correct.  File output is incorrect.  Note that the entire JSON object is quoted when sent to the file instead of being stored as a JSON object it is stored as a string.

File records this incorrect JSON message:
{code:java}
{
...log4j json...
"message" : "{id=3, event=Performance}",
....
}
{code}
Console correctly reports a JSON message  this way:

 
{code:java}
{...
  "message" : {
    "id" : "3",
    "event" : "Performance"
  },
  ...}
{code}
Entire JSON Message from Console:

 
{code:java}
{
  "thread" : "main",
  "level" : "INFO",
  "loggerName" : "###.###.###.$###",
  "message" : {
    "id" : "3",
    "event" : "Performance"
  },
  "endOfBatch" : false,
  "loggerFqcn" : "org.apache.logging.log4j.scala.Logger$",
  "instant" : {
    "epochSecond" : 1571338092,
    "nanoOfSecond" : 150000000
  },
  "threadId" : 1,
  "threadPriority" : 5
}
{code}

Entire JSON Log Message from file:
{code:java}
{
 "thread" : "main",
 "level" : "INFO",
 "loggerName" : "com.###.analytics.framework.DataRead$",
 "message" : "{id=3, event=Performance}",  <<<<<This JSON Message is incorrectly handled as a string>>>>
 "endOfBatch" : false,
 "loggerFqcn" : "org.apache.logging.log4j.scala.Logger$",
 "instant" : {
 "epochSecond" : 1571337979,
 "nanoOfSecond" : 468000000
 },
 "threadId" : 1,
 "threadPriority" : 5
}{code}



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