Grok pattern with this log line

Question

basically I need to filter out Date - SEVERITY - JAVACLASSNAME - ERROR MESSAGE.

This is working for me..But its just half done. (?[0-9]{4}-[0-9]{2}-[0-9]{2} [0-9]{2}:[0-9]{2}:[0-9]{2},[0-9]{3}) %{WORD:Severity}(?:%{GREEDYDATA:msg})

It doesnt show Javaclass..!

Here is the output I get

{
  "Timestamp": [
    [
      "2015-03-03 03:12:16,978"
    ]
  ],
  "Severity": [
    [
      "INFO"
    ]
  ],
  "Error_Message": [
    [
      " [http-bio-16006-exec-71] [XYZ.ABC.JLM.app.task.ERT] [app:/saas reqid:23121221 jsid:* aid:* uid: org: vorg: un:] - Received to update queued for monitorId=54213213JBNJBSJBSJBS, worklow=8u298u2189u312, session=21684216814321"
    ]
  ]
}

LOGLINE

2015-03-03 03:12:16,978 INFO [http-bio-16006-exec-71] [XYZ.ABC.JLM.app.task.ERT] [app:/saas reqid:23121221 jsid:* aid:* uid: org: vorg: un:] - Received to update queued for monitorId=54213213JBNJBSJBSJBS, worklow=8u298u2189u312, session=21684216814321

Answer 1

This should work:

filter {
  grok {
    match => [
      "message",
      "%{TIMESTAMP_ISO8601:timestamp} %{LOGLEVEL:severity} \[(?<threadname>[^\]]+)\] \[(?<classname>[^\]]+)\] %{GREEDYDATA:message}"
    ]
    overwrite => ["message"]
  }
}