>First some annoying :core:checkstyleTest that interferes with files generated by Intellij IDEA, with hundreds of error messages similar to the following:
We exclude generated files from the style checks via the following patterns: https://github.com/apache/calcite/blob/a6293a37dd4166e6fe69ae0c5ef7a89e6677b6ab/build.gradle.kts#L259-L276 Please add the relevant pattern and file the PR. However, it is really strange that you get the generated files into generated/sources/version/generated and javacc/javaCCTest/generated_tests folders. I don't understand why IDEA would generate files into those folders. It does not sound like your ImmutableMyProjectFilterRuleConfig is connected with javaCCTest. I would try to understand why do you get files into /javaCCTest/ and /version/ folders. A side note: Kotlin does have the official coding style, so there's a formatter that yields nice results and that is consistent with IDEs. So moving to Kotlin makes many Checkstyle rules obsolete. No joking. >Caused by: java.lang.ArrayIndexOutOfBoundsException: Index 0 out of bounds for length 0 It is very likely you are using an outdated version of javac which produced invalid bytecode. Please upgrade javac (e.g. to the recent patchset). Note: GitHub CI uses recent patchet updates, so you might fail to reproduce the issue. We do know javac versions 1.8 before u202 are extremely buggy, so we fail the build for those versions. It might be time to add the same verification for 11, and require 11.0.5 or later (in case of 11). >Is there an easy way to fix the problem? The easy fix is to bump the javac version. The funny coincidence is that Kotlin solves this issue as well: null safety is integrated into the regular compilation, so there's no need for a separate (and time-consuming!) checker framework compilation. Vladimir
