Parsing multiline java execption

Elastic Stack Logstash
1

Hello, I am trying to add multiline to handle javaexception in our logs but still having issue :

This is my pattern :

 paths:
    - /var/log/tomcat10/*
  multiline.type: pattern
  multiline.pattern: '^\d{2}-\w{3}-\d{4} \d{2}:\d{2}:\d{2}\.\d{3}'
  multiline.negate: true

my logstash config looks like:

input {
  beats {
    port => 5044
  }
}

filter {
  if [log][file][path] == "/var/log/web.stdout.log" {
    grok {
      match => { "message" => "%{SYSLOGTIMESTAMP:log_timestamp} %{IPORHOST:log_host} %{WORD:log_program}\[%{POSINT:log_pid}\]: %{GREEDYDATA:log_details}" }
    }
    date {
      match => [ "log_timestamp", "dd/MMM/yyyy:HH:mm:ss Z" ]
      target => "log_timestamp"
    }
    mutate {
      remove_field => [ "log_host", "log_pid" ]
    }
  } else if [log][file][path] =~ /^\/var\/log\/tomcat10\/localhost_access_log\.txt/ {
    grok {
      match => { "message" => "%{IPORHOST:clientip} - - \[%{HTTPDATE:log_timestamp}\] \"%{GREEDYDATA:log_details}" }

    }
    date {
      match => [ "log_timestamp", "dd-MMM-yyyy HH:mm:ss.SSS" ]
      target => "log_timestamp"
    }
    mutate {
      remove_field => [ "clientip" ]
    }
  } else if [log][file][path] =~ /^\/var\/log\/tomcat10\/catalina\.\d{4}-\d{2}-\d{2}\.log/ {
    grok {
      match => {
        "message" => "%{MONTHDAY:day}-%{MONTH:month}-%{YEAR:year} %{HOUR:hour}:%{MINUTE:minute}:%{SECOND:second}.%{NONNEGINT:millisecond} %{LOGLEVEL:loglevel} \[%{DATA:thread}\] %{JAVACLASS:class} %{GREEDYDATA:log_details}"
      }
    }
    mutate {
      remove_field => [ "thread", "class" ]
      add_field => { "log_timestamp" => "%{day}-%{month}-%{year} %{hour}:%{minute}:%{second}.%{millisecond}" }
    }
    date {
      match => [ "log_timestamp", "dd-MMM-yyyy HH:mm:ss.SSS" ]
      target => "log_timestamp"
    }
  } else if [log][file][path] =~ /^\/var\/log\/tomcat10\/localhost\.\d{4}-\d{2}-\d{2}\.log/ {
    grok {
      match => {
        "message" => "%{MONTHDAY:day}-%{MONTH:month}-%{YEAR:year} %{HOUR:hour}:%{MINUTE:minute}:%{SECOND:second}.%{NONNEGINT:millisecond} %{LOGLEVEL:loglevel} \[%{DATA:thread}\] %{JAVACLASS:class} %{GREEDYDATA:log_details}"
      }
    }
    mutate {
      remove_field => [ "thread", "class" ]
      gsub => [ "log_details", "V2MessageServlet:", "" ]
      add_field => { "log_timestamp" => "%{day}-%{month}-%{year} %{hour}:%{minute}:%{second}.%{millisecond}" }
    }
    date {
      match => [ "log_timestamp", "dd-MMM-yyyy HH:mm:ss.SSS" ]
      target => "log_timestamp"
    }
  }
}

output {
  elasticsearch {
    hosts => ["http://XXXX:9200"]
    user => "XXX"
    password => "XXXXX"
    index => "nlogs"
  }
  if "_grokparsefailure" in [tags] or "_dateparsefailure" in [tags] {
    stdout { codec => rubydebug }
}

}

this is my sample data :

15-Nov-2023 21:55:19.476 INFO [http-nio-8080-exec-2] org.apache.catalina.core.ApplicationContext.log V2MessageServlet: Error handling message [300434068633270/2170]
15-Nov-2023 21:55:19.496 INFO [http-nio-8080-exec-2] org.apache.catalina.core.ApplicationContext.log V2MessageServlet: Parse error handling message: 300434068633270/2170
15-Nov-2023 21:58:45.864 SEVERE [http-nio-8080-exec-1] org.apache.catalina.core.StandardWrapperValve.invoke Servlet.service() for servlet [ErrorCheckServlet] in context with path [] threw exception [💥 Test Exception! 💥] with root cause
	jakarta.servlet.ServletException: 💥 Test Exception! 💥
		at net.boggroup.buoyserver.ErrorCheckServlet.doGet(ErrorCheckServlet.java:20)
		at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:564)
		at jakarta.servlet.http.HttpServlet.service(HttpServlet.java:658)
		at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:205)
		at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
		at org.apache.tomcat.websocket.server.WsFilter.doFilter(WsFilter.java:51)
		at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:174)
		at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:149)
		at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:167)
		at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:90)
		at org.apache.catalina.authenticator.AuthenticatorBase.invoke(AuthenticatorBase.java:482)
		at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:115)
		at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:93)
		at org.apache.catalina.valves.RemoteIpValve.invoke(RemoteIpValve.java:735)
		at org.apache.catalina.valves.AbstractAccessLogValve.invoke(AbstractAccessLogValve.java:673)
		at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:74)
		at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:340)
		at org.apache.coyote.http11.Http11Processor.service(Http11Processor.java:391)
		at org.apache.coyote.AbstractProcessorLight.process(AbstractProcessorLight.java:63)
		at org.apache.coyote.AbstractProtocol$ConnectionHandler.process(AbstractProtocol.java:896)
		at org.apache.tomcat.util.net.NioEndpoint$SocketProcessor.doRun(NioEndpoint.java:1744)
		at org.apache.tomcat.util.net.SocketProcessorBase.run(SocketProcessorBase.java:52)
		at org.apache.tomcat.util.threads.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1191)
		at org.apache.tomcat.util.threads.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:659)
		at org.apache.tomcat.util.threads.TaskThread$WrappingRunnable.run(TaskThread.java:61)
		at java.base/java.lang.Thread.run(Thread.java:833)

When I tested my setting with the Gork debugger is shows the result as expected same when I tried to match my multiline pattern in GOplaygound also everything is matched but still logs in kibana doesn't show as expected and they come as separate messages.

2

You should move this to the filebeat forum, it is not a logstash question.

3

As mentioned, this is related to Filebeat, so you need to share your filebeat.yml file.

Are you using the deprecated log input or the filestream input? The configuration changes depending on what input you are using.

But in both cases, the match option is missing, you need to add multiline.match: after` as the example in the documentation, this will make every line that does not match your regex pattern will be added to the previous line.

Also, your pattern can be just this: '^\d{2}-\w{3}-\d{4}.

2 Likes
4

Thank you for your help! You were spot on with identifying my mistake. I was using Filestream and with log config in my parser, which was causing my issue. After changing the parser to Filestream config the issue has been resolved. I really appreciate your prompt response and willingness to assist me, even though I posted in the wrong forum. Thank you again!

1 Like
5

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