The easiest way to find the product log file is the Help menu, the item name would depend on the IDE version and OS:
- Show Log in Explorer
- Show Log in Finder
- Show Log in Konqueror/Nautilus
- Reveal Log in Explorer
- Reveal Log in Finder/Finder/Nautilus
Log file is named idea.log and is rotated basing on the file size. When attaching logs to your problem report it's recommended to zip and send several latest log files (idea.log, idea.log.1, idea.log.2, idea.log.3).
You can also use the Collect Logs and Diagnostic Data (Compress Logs and Show in ... before 2020.1) action to generate the .zip file with all the log files (including the build logs and the automatic thread dumps).
Can't access Help menu, how do I find the log file manually?
When IDE doesn't start or you can't access Help menu, locate the log file manually:
IntelliJ IDEA External Build logs
IDE starts a separate process for compilation, this process writes logs into the %idea.log.path%\build-log\build.log file. Attach this file as well if you are reporting problems related to compilation.
For the more verbose logging edit build-log-jul.properties file (located next to the build.log file), uncomment the last line, so that it looks like this (\# is escaping the comment symbol):
\#org.jetbrains.jps.level=FINER
It's recommended that you delete the existing log files, start the IDE, reproduce the problem, then attach all the new log files.
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