Is it safe to delete IntelliJ's system directory?
caching, ide, intellij-idea, java, temporary-files
Solution
It's perfectly safe though there are some quite useful caches there which will be lost. For example, you'll face long project reindexing, rebuild, Maven may decide to re-download the Internet, your VCS repository commits will be re-queried, the statistics used in code completion will be re-queried.
Problem
IntelliJ keeps a bunch of cache files in its "system" directory (settings and downloaded plugins are written to a separate config directory). Is it safe to delete this directory (not while IntelliJ is running), without losing settings? The reason is that I might put it on a tmpfs, which gets cleared on shutdown.