Can you please wrap code and expressions in {noformat} or {code} blocks (see Confluence help on macros).

Done, please check, thks.

Ok, I now tried to reproduce the bug without success: I created your parser and let it scan the console log that contains all Java source files of Jenkins (5.716 KB). This works quite fast and had no problems so far.

Maybe your command line argument is not really passed in your build. Can you have a look at the Jenkins process to see how much memory is allocated? Or there is not much memory left in your Jenkins when you start the Job... What does the Jenkins monitoring plugin report?

I mentioned in my original report that our log file is quite large, more than 20MB. The parser can process log file within 1MB quite well. I am using a server with 32GB memory and set java environment parameter -Xmx4096m. I don't know if I should enlarge the parameter?

And there may be another problem as I mentioned. When jenkins process multiple log files it seems that it will process all the files together rather than one by one.

That does not change anything, even if the console log is 46.776 KB - and using the default vm settings. Can you please check if your Java process fills up the whole memory of 4GByte?. Is your build on a slave? Does your parser really not contain a newline character?

I mean MB not KB, 46.776KB is OK in my environment too.

Sorry, I copied the number using my locale settings (German), the dot is used as separator between thousandths 46.776KB = 46,7MB (in German), in English the separators are used in the opposite way.

Can you please check if your Java process fills up the whole memory of 4GByte?. Is your build on a slave? Does your parser really not contain a newline character?

Ah, yes, the build is on a windows slave with 2GB memory. So it doesn't matter how many master's memory left. I tried add these parameters "-Xms512m -Xmx1024m" to the node's "Launch method" option. But it seems the same. I found that the java process cost more than 311MB memory when this job was running through windows task manager. How can I modify the slave's heap space?

I don't know how to change that. How do you connect your slaves? ssh? jnlp?

I've found the way to change slave's java memory heap. Just add "-Xmx512m" to '<arguments>' in jenkins-slave.xml which is located in slave's JENKINSROOT.
And I connect my slave using jnlp.
Thank you!