Parse log4j schema error

Hello, I would like parse lo4j file and the result of schema is:
> {

    "logger_name" => "org.apache.spark.SparkContext",
           "path" => "org.apache.spark.SparkContext",
          "class" => "?",
       "priority" => "INFO",
      "timestamp" => 2019-05-27T12:26:13.052Z,
         "method" => "?",
         "thread" => "Thread-1",
       "@version" => "1",
           "file" => "?:?"
}

I need to parse the value of "file", "method"and "class"
Anyone Answer for this problem?

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