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Declare the _task_ as your source set's `srcDir:
```sourceSets {
   main {
      java {
         srcDir tasks.generateJava
       }
   }
}```
That way, Gradle knows (explicitly) that it has to execute that task to generate its outputs whenever a task depends on the source set (such as `compileJava`)

In case the `GenerateTask` declares more outputs than its `outputDir`, you can use instead:
```sourceSets {
   main {
      java {
         srcDir project.files(openapiJavaSrcDir).builtBy(tasks.generateJava)
      }
   }
}```
(maybe you'll have to use `srcDirs` instead of `srcDir`, I don't remember)