log4j2的JsonLayout如何将堆栈跟踪打印成字符串一次

Question

我的项目使用log4j2 2.13.3。
如下所示记录：

    "message": "404 NOT_FOUND \"Unable to find instance for xxx\"",
    "thrown": {
        "commonElementCount": 0,
        "localizedMessage": "404 NOT_FOUND \"Unable to find instance for xxx\"",
        "message": "404 NOT_FOUND \"Unable to find instance for xxx\"",
        "name": "org.springframework.cloud.gateway.support.NotFoundException",
        "suppressed": [
            {
                "commonElementCount": 0,
                "localizedMessage": "xxx\nStack trace:",
                "message": "xxx\nStack trace:",
                "name": "reactor.core.publisher.FluxOnAssembly$OnAssemblyException",
                "extendedStackTrace": "stack trace"
            }
        ],
        "extendedStackTrace": "stack trace"
    },

ExtendedStackTrace出现两次。有没有办法让堆栈跟踪出现一次。

像这样：（复制自http://logging.apache.org/log4j/log4j-2.2/manual/layouts.html#JSONLayout)

[
  {
    "logger":"com.foo.Bar",
    "timestamp":"1376681196470",
    "level":"INFO",
    "thread":"main",
    "message":"Message flushed with immediate flush=true"
  },
  {
    "logger":"com.foo.Bar",
    "timestamp":"1376681196471",
    "level":"ERROR",
    "thread":"main",
    "message":"Message flushed with immediate flush=true",
    "throwable":"stack trace"
  }
]

Answer 1

如果您希望作为JSON登录，我建议您升级并使用新的JSONTemplateLayout。它使您可以对生成的输出进行更多的控制。

为了将日志记录到ELK堆栈，我更喜欢使用GELF布局和SocketAppender将日志发送到LogStash。有关更多信息，请参见登录云。