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Logstash class file 和 method都是问号

Logstash | 作者 xujianxing | 发布于2016年10月18日 | 阅读数:4385

 "_index": "meipianapp-2016.10.18",
"_type": "log4j",
"_id": "AVfXDMl1egLz1PD_qnMm",
"_score": null,
"_source": {
"message": "用户查询时光祭异常:MjController.userMjActivityPast: aMapCityCode:010",
"@version": "1",
"@timestamp": "2016-10-18T09:08:41.324Z",
"timestamp": 1476781719183,
"path": "com.meipian.core.api.controller.MjActivityController",
"priority": "ERROR",
"logger_name": "com.meipian.core.api.controller.MjActivityController",
"thread": "http-bio-8080-exec-6",
"class": "?",
"file": "?:?",
"method": "?",

请问这是为什么?

我的logstash是这样配置的:
input {

  log4j {

    mode => "server"

    host => "0.0.0.0"

    port => 4567

    type => "log4j"

  }

}

    filter {

                date {

      match => [ "timestamp" , "dd/MMM/yyyy:HH:mm:ss +0800" ]

      timezone => "UTC"

           }

        }

output {

  elasticsearch {

     hosts=> ["10.105.103.125:9200"]

     index => "meipianapp-%{+YYYY.MM.dd}"

  }

}
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