No warning when project is build

[v-kuzma]

Hello, I have a problem. When I rebuild the project in gradle, no warnings are displayed. The command ./gradle -clean does not help me. I can see warnings only once time after cache cleaning or changing the errorprone-plugin version.

[tbroyer]

If I understand correctly, this is the expected behavior: without -Werror, warnings do not fail the build, so when rebuilding without code change the task is up-to-date, and warnings aren't displayed. If you use the build cache, the task result is taken from the cache, so again no compilation and no warnings.

This is Gradle's standard behavior for compilation warnings, that'd be the same for, e.g. deprecation warnings.
And with incremental recompilation, you'd also only have warnings for recompiled classes.

[v-kuzma]

Yes, you are right. I think using errorprone without -Werror is possible when the gradle cache is off. I may turn off cache using command-line arguments for certain cases. Is possible to create a feature in the next errorprone releases that allows managing to use a cache? I think it is would be more convenient.
Thanks for your reply!

[tbroyer]

Is possible to create a feature in the next errorprone releases that allows managing to use a cache?

No, this is not the plugin's role (as I said, you'd have the same behavior with Xlint warnings, or warnings emitted by annotation processors, etc.)

You can do it yourself though by configuring the task outputs' cacheIf/doNotCacheIf and/or upToDateWhen. See https://blog.gradle.org/stop-rerunning-tests though, which explains why it's probably not a good idea (in other words, I'd personally stick with cleanCompileJava or --rerun-tasks, and --no-build-cache).

Because this is unrelated to ErrorProne or this plugin themselves (there are other warnings), and is directly related to incremental builds and build caching, I think you should bring this discussion to the Gradle forum to find the best solution (I, for one, always use -Werror, so I'm not affected).
See also gradle/gradle#16984 (about Kotlin, but applies just as well to Java)

[v-kuzma]

Ok, Thanks