IntelliJ Bug / Missing Feature
Using the in-built JDK tool for javadoc with the version 14-ea and above, I could easily generate Javadoc for a record.
The command used for the same is \
/jdk-14.jdk/.../javadoc --release=14 --enable-preview .../src/main/java/.../CityRecord.java
So this would certainly be something missing in IntelliJ. (Since the ‘Add Javadoc’ option also doesn’t include the components.)
I must add from the IntelliJ development point of view, of course as a preview feature prioritizing the work dedicated towards it to such an extent is also a call that must be taken carefully.
Update: I could verify that this has been fixed with the latest update from IntelliJ:
IntelliJ IDEA 2020.2.2 Preview (Community Edition)
Build #IC-202.7319.5, built on September 1, 2020
Runtime version: 11.0.8+10-b944.31 x86_64