Java regular expression to match exception stack trace from logger

Question

I have the following regex which I obtained Regular expression to parse a log file and find stacktraces

^.+Exception[^\n]++(\s+at .++)+

It works great to find stack traces. However, I need to find stack traces that are outputted through a logger (in a Bukkit Minecraft server, specifically). They look like this:

2012-08-10 08:19:17 [SEVERE] java.lang.NullPointerException
2012-08-10 08:19:17 [SEVERE] at net.minecraft.server.World.tickEntities(World.java:1146)
2012-08-10 08:19:17 [SEVERE] at net.minecraft.server.MinecraftServer.q(MinecraftServer.java:567)
2012-08-10 08:19:17 [SEVERE] at net.minecraft.server.DedicatedServer.q(DedicatedServer.java:212)
2012-08-10 08:19:17 [SEVERE] at net.minecraft.server.MinecraftServer.p(MinecraftServer.java:476)
2012-08-10 08:19:17 [SEVERE] at net.minecraft.server.MinecraftServer.run(MinecraftServer.java:408)
2012-08-10 08:19:17 [SEVERE] at net.minecraft.server.ThreadServerApplication.run(SourceFile:539)

The date and times will always change, but the [SEVERE] will always be there. I'm looking to capture that format of exception with a regular expression. Any Exception, not just an NPE.

I'm really not sure how to go about this. I checked out some tutorials on regex but these bigs ones are all gibberish to me still. This is my most recent attempt

^.+Exception[^\n]++(.++at .++)+

Edit: Okay, I did some more research and got a little further. I made this: \d{4}-\d{2}-\d{2}\s\d{2}:\d{2}:\d{2}\s\[SEVERE\] Which matches the first part. I'm having some trouble capturing the entire trace though.

It would appear you don't understand regular expressions. There's a number of resources on the web (probably tens of thousands) that you could use to better your understanding. Or, start with the oracle tutorial here: docs.oracle.com/javase/tutorial/essential/regex — Brian Roach
– Brian Roach, Commented Jul 3, 2013 at 1:46

signus · Accepted Answer · 2014-02-14 22:53:19Z

This is great for your method of using Logger. By default the stack traces print out with tabs for every line of the stack trace. My example matches the beginning line with the date and original error message plus the Exception error and stack traces if they are there.

((?:[a-zA-Z]{3} \d{1,2}, \d{4,4} \d{1,2}:\d{2}:\d{2} (AM|PM) (\(INFO\)|\(SEVERE\)|\(WARNING\))).*\r(?:(.*Exception.*(\r.*)(\tat.*\r)+)))|((?:[a-zA-Z]{3} \d{1,2}, \d{4,4} \d{1,2}:\d{2}:\d{2} (AM|PM) (\(INFO\)|\(SEVERE\)|\(WARNING\))).*)

Which matches for any of the following:

Feb 08, 2014 5:18:00 PM (SEVERE) Thread: 13 [com.datarefresh.refresh.RefreshActionQueuePersister.write] Could not write RefreshActionQueue checkpoint due to error
Feb 09, 2014 1:00:10 AM (INFO) Thread: 14 [com.datarefresh.refresh.RefreshWorker.doPostProcess] (DATA_INSIGHT_DATA_REFRESH.15) Post-processing...
Feb 09, 2014 1:00:20 AM (SEVERE) Thread: 14 [com.datarefresh.refresh.RefreshActionQueuePersister.write] Could not write RefreshActionQueue checkpoint due to error
java.lang.RuntimeException: Could not delete RefreshActionQueue checkpoint file
    at com.datarefresh.refresh.RefreshActionQueuePersister.delete(RefreshActionQueuePersister.java:71)
    at com.datarefresh.refresh.RefreshActionQueuePersister.write(RefreshActionQueuePersister.java:53)
    at com.refresh.RefreshActionQueue.persist(RefreshActionQueue.java:94)
    at com.refresh.RefreshActionQueue.removeCurrentAction(RefreshActionQueue.java:48)
    at com.refresh.RefreshWorker.doPostProcess(RefreshWorker.java:304)
    at com.refresh.RefreshWorker.doActions(RefreshWorker.java:82)
    at com.refresh.RefreshWorker.call(RefreshWorker.java:57)
    at com.datarefresh.refresh.RefreshWorker.call(RefreshWorker.java:28)
    at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:303)
    at java.util.concurrent.FutureTask.run(FutureTask.java:138)
    at java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
    at java.lang.Thread.run(Thread.java:662)
Feb 09, 2014 1:00:20 AM (INFO) Thread: 14 [com.datarefresh.refresh.RefreshWorker.doPostProcess] (DATA_INSIGHT_DATA_REFRESH.16) Done post-processing.

In reality I would remove INFO from the matching.

Jacob Brunson · Accepted Answer · 2013-07-03 02:07:58Z

3

I did it guys!

^.+Exception[^\n]++(\s\d{4}-\d{2}-\d{2} \d{2}:\d{2}:\d{2} \[SEVERE\] at .++)+

You just have to turn on DOTALL when you compile it.

answered Jul 3, 2013 at 2:07

Jacob Brunson

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1 Comment

signus Over a year ago

This is only consistent for the method you choose to report your logs as. Good primer for you to learn regular expressions, however.

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