Andrey Adamovich Andrey Adamovich - 2 months ago 12
Java Question

Tool to extract java stack traces from log files

Is there any tool that can extract a list of stack traces appearing in the log file and probably count unique ones?

EDIT: I would preffer something that is not GUI-based and be run on the background and give some kind of report back. I have quite many logs gathered from several environments and just would like to get quick overview.

Answer

I have come up with the following Groovy script. It is, of course, very much adjusted to my needs, but I hope it helps someone.

def traceMap = [:]

// Number of lines to keep in buffer
def BUFFER_SIZE = 100

// Pattern for stack trace line
def TRACE_LINE_PATTERN = '^[\\s\\t]+at .*$'

// Log line pattern between which we try to capture full trace
def LOG_LINE_PATTERN = '^([<#][^/]|\\d\\d).*$'

// List of patterns to replace in final captured stack trace line 
// (e.g. replace date and transaction information that may make similar traces to look as different)
def REPLACE_PATTERNS = [
  '^\\d+-\\d+\\@.*?tksId: [^\\]]+\\]',
  '^<\\w+ \\d+, \\d+ [^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <',
  '^####<[^>]+?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <[^>]*?> <',
  '<([\\w:]+)?TransaktionsID>[^<]+?</([\\w:]+)?TransaktionsID>',
  '<([\\w:]+)?TransaktionsTid>[^<]+?</([\\w:]+)?TransaktionsTid>'
]

new File('.').eachFile { File file ->
  if (file.name.contains('.log') || file.name.contains('.out')) {
    def bufferLines = []
    file.withReader { Reader reader ->
      while (reader.ready()) {      
        def String line = reader.readLine()
        if (line.matches(TRACE_LINE_PATTERN)) {
          def trace = []
          for(def i = bufferLines.size() - 1; i >= 0; i--) {
            if (!bufferLines[i].matches(LOG_LINE_PATTERN)) {
              trace.add(0, bufferLines[i])
            } else {
              trace.add(0, bufferLines[i])
              break
            }
          }
          trace.add(line)
          if (reader.ready()) {
            line = reader.readLine()
            while (!line.matches(LOG_LINE_PATTERN)) {
              trace.add(line)
              if (reader.ready()) {
                line = reader.readLine()
              } else {
                break;
              }
            }
          }
          def traceString = trace.join("\n")
          REPLACE_PATTERNS.each { pattern ->
            traceString = traceString.replaceAll(pattern, '')
          }
          if (traceMap.containsKey(traceString)) {
            traceMap.put(traceString, traceMap.get(traceString) + 1)
          } else {
            traceMap.put(traceString, 1)
          }
        }
        // Keep the buffer of last lines.
        bufferLines.add(line)
        if (bufferLines.size() > BUFFER_SIZE) {
          bufferLines.remove(0)
        }
      }
    }
  }
}

traceMap = traceMap.sort { it.value }

traceMap.reverseEach { trace, number ->
  println "-- Occured $number times -----------------------------------------"
  println trace
}