Compiling generated Java sources

Just solved it, I really missed something.

I had to replace

java {
    sourceSets["main"].java {
        "build/generated/sources/srcgen"
    }
}

by

java {
    sourceSets["main"].java {
        srcDir("build/generated/sources/srcgen")
    }
}

The change is the srcDir(...) constructor.

I tried quite long, and just after posting and rereading a topic for the n-th time, I found this detail. I apologize …