Groovy incremental compilation

[tcrespog]

Can Micronaut Groovy projects take advantage of incremental compilation?

I've built this sample multiproject made of a Groovy subproject and a Java subproject: https://github.com/tcrespog/mn-incremental.
In the Groovy subproject, I've enabled incremental compilation by following the Gradle guidelines regarding Groovy compilation avoidance and incremental compilation; other than that, the Java subproject is a dependency of the Groovy subproject.

As far as I can see, compilation avoidance works: a change (ABI-compatible) in the Java subproject does not trigger a recompilation of the Groovy project.

However, I'd say incremental compilation is not working: the compileGroovy task execution time values do not vary greatly when comparing compilations with incremental compilation enabled vs disabled. Nevertheless, in the Java subproject, I can notice significant differences in elapsed time and lines in the output such as: Note: Creating bean classes for 2 type elements.

[jeffscottbrown]

@melix Do you know the answer to the question above?

[melix]

Adding -i to the build gives us the following:

Full recompilation is required because Incremental annotation processing is not supported by Groovy

So we have our answer: incremental compilation doesn't work with Groovy in the case of Micronaut, because of annotation processing.