APT: Remove stub Java file after Java compile step

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/internal/AnnotationProcessingManager.kt

@@ -39,6 +39,7 @@ public class AnnotationProcessingManager(
         val JAVA_FQNAME_PATTERN = "^([\\p{L}_$][\\p{L}\\p{N}_$]*\\.)*[\\p{L}_$][\\p{L}\\p{N}_$]*$".toRegex()
         val WRAPPERS_DIRECTORY = "wrappers"
         val ANNOTATIONS_FILENAME = "annotations.kotlin.txt"
+        val GEN_ANNOTATION = "__gen/annotation"
     }
 
     fun getAnnotationFile(): File {
@@ -59,9 +60,14 @@ public class AnnotationProcessingManager(
         addGeneratedSourcesOutputToCompilerArgs(javaTask, aptOutputDir)
     }
 
+    fun afterJavaCompile() {
+        val generatedFile = File(javaTask.getDestinationDir(), "$GEN_ANNOTATION/Cl.class")
+        if (generatedFile.exists()) generatedFile.delete()
+    }
+
     private fun generateJavaHackFile(aptDir: File, javaTask: JavaCompile) {
         val javaAptSourceDir = File(aptDir, "java_src")
-        val javaHackPackageDir = File(javaAptSourceDir, "__gen/annotation")
+        val javaHackPackageDir = File(javaAptSourceDir, GEN_ANNOTATION)
 
         javaHackPackageDir.mkdirs()
 

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/KotlinPlugin.kt

@@ -174,6 +174,10 @@ class Kotlin2JvmSourceSetProcessor(
                     javaTask.doFirst {
                         kaptManager.setupKapt()
                     }
+
+                    javaTask.doLast {
+                        kaptManager.afterJavaCompile()
+                    }
                 }
             }
         }
@@ -443,6 +447,10 @@ open class KotlinAndroidPlugin [Inject] (val scriptHandler: ScriptHandler, val t
                 javaTask.setClasspath(javaTask.getClasspath() + project.files(kotlinTask.property("kotlinDestinationDir")))
                 kaptManager?.setupKapt()
             }
+
+            javaTask doLast {
+                kaptManager?.afterJavaCompile()
+            }
         }
     }