High Sierra is looking for JDK on login
I just got around to upgrading to 10.13.6 High Sierra. Since I upgraded something is trying to run java when I log in and about every hour thereafter, popping an annoying "to use the java command-line too you need to install a JDK" dialog box I need to clear. I've deleted or disabled all login items, extensions, and my .login/.profile/.bashrc. I don't see anything in console messages when I search for "jdk" or "java". Every app seems to be fine, so I see no need to actually install a JDK.
Any ideas? Is more verbose logging possible? I could probably fix this by disabling SIP and replacing the java command with /bin/false or something, but I don't want to that except as a last resort.
MacBook Air 11", macOS 10.13