Tool to extract java stack traces from log files [closed]

Question

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 1

Here is a quick-and-dirty grep expression... if you are using a logger such as log4j than the first line of the exception will generally contain WARN or ERROR, the next line will contain the Exception name, and optionally a message, and then the subsequent stack trace will begin with one of the following:

1. "\tat" (tab + at)
2. "Caused by: "
3. "\t... <some number> more" (these are the lines that indicate the number of frames in the stack not shown in a "Caused by" exception)
4. An Exception name (and perhaps message) before the stack

We want to get all of the above lines, so the grep expression is:

grep -P "(WARN|ERROR|^\tat |Exception|^Caused by: |\t... \d+ more)"

It assumes an Exception class always contains the word Exception which may or may not be true, but this is quick-and-dirty after all.

Adjust as necessary for your specific case.

Answer 2

You can write this yourself pretty easily. Here is the pattern:

1. Open file
2. Search for the string "\n\tat " (that's new line, tab, at, blank) This is a pretty uncommon string outside of stack traces.

Now all you need to do is find the first line that doesn't start with \t to find the end of the stack trace. You may want to skip 1-3 lines after that to catch chained exceptions.

Plus add a couple of lines (say 10 or 50) before the first line of the stack trace to get some context.