Commenting out Apex class method causes IntelliJ to hang

[Jason Clark]

Just updated this morning to IntelliJ 2018.2.4 and Illuminated Cloud 2.0.3.7. I performed the following steps and got a hang-crash, reproducibly, several times:

1. Find in Path... (Cmd+Shift+F) to find usages of an SObject Field.
2. Click a usage to open containing file.
3. Click in containing method's name and Find Usages (Cmd+Opt+F7) to confirm method isn't used anywhere.
4. Highlight the entire method (via shift+DnArrow)
5. Comment out method via Comment with Line Comment (Cmd+/).

The comment line-prefixes ("//") appear, but the code highlighting never changes to comment coloring, and IntelliJ becomes unresponsive. After a minute or two, IntelliJ shows the SBOD, and I have to hard-force-quit.

I have attached a log file. Of note: I found that my Debug Log config still contains some directives from another issue I submitted a while back; I chose to leave these lines in place:

#com.illuminatedcloud.intellij.completion.ApexCompletionContext
#com.illuminatedcloud.intellij.completion.ApexCompletionRule
#com.illuminatedcloud.intellij.completion.ApexVariantsCompletionRule
#com.illuminatedcloud.intellij.completion.ApexSObjectFieldsCompletionRule
#com.illuminatedcloud.intellij.psi.util.SObjectUtil

The end of the log shows a long exception stack trace, right below "2018-09-24 09:46:24,741 [ 111615] ERROR - j.psi.stubs.StubTreeLoaderImpl - Outdated stub in index:...", so after capturing the attached log, I restarted IntelliJ and did a Full Rebuild of the OST. This did NOT resolve the issue; the reproduction steps above still cause a full crash and the same Error & Exception in the log.

The attached idea.log was grabbed right after one of the freezes and before a restart. The zip is from "Compress Logs and Show in Finder" after the full OST rebuild/restart/reproduce error.

[Scott Wells]

Jason, your log definitely shows stale/corrupted caches/indices which may be a result of a bug in a previous build that should be fixed now. Do you mind rebuilding caches and indices and seeing whether this happens again? I'll keep this issue open for a while in case it does, but that's definitely where I'd recommend starting since it's an obvious issue in the log that should be easy to resolve.

[Jason Clark]

Just dropped priority from "Blocker" to "Critical" as I found a work-around.

I noticed that individually commenting out lines (starting from the method declaration ("public <type> <methodName>") didn't cause I hang. Instead of manually editing all 35 lines, I undid my changes and highlighted the whole method again, then used multi-edit mode (aka Column Selection Mode) to insert the "//" at the start of all the lines. No hang/crash. I then saved the file (this is standard non-DX project) and again no issues. So I am able to continue working on the project.

[Jason Clark]

Scott, is "rebuilding caches and indices" different than "Generate Offline Symbol Table"? Because I tried that. If it is different, can you point me to the option?

[Scott Wells]

Hi, Jason. Yes, please refer to the end of this section from the FAQ:

http://www.illuminatedcloud.com/support/faq#CompletionNavigationNotworking

[Jason Clark]

Okay, found "Invalidate caches and Restart" option in the menu before I saw your reply, so I did the full rebuild. First, confirmed that I could undo the commented-out code (from the workaround) and still reproduce the freeze. Invalidated, Restarted, and waited for "Indexing..." to complete. After which I was able to successfully comment out the code via Cmd+/ without a freeze, and then save the code to the server.

Thanks for your help. TIL regenerating OST != Rebuilding Caches

[Scott Wells]

Ah, good. This okay to resolve for now? Obviously feel free to reopen if you see it recur.

[Jason Clark]

Don't know if there's any way for plugin updates to auto-invalidate the IC cache, but if so might be worth it. It's resolved for me, so feel free to close. Thanks for the help!