kapt: Fix sequential builds (KT-8733)

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

@@ -89,15 +89,17 @@ public class AnnotationProcessingManager(
         val javaAptSourceDir = File(aptWorkingDir, "java_src")
         val javaHackPackageDir = File(javaAptSourceDir, GEN_ANNOTATION)
 
-        javaHackPackageDir.mkdirs()
+        if (!javaHackPackageDir.exists()) javaHackPackageDir.mkdirs()
 
         val javaHackClFile = File(javaHackPackageDir, "Cl.java")
-        javaHackClFile.writeText(
-                "package __gen.annotation;" +
-                "class Cl { @__gen.KotlinAptAnnotation boolean v; }")
+        if (!javaHackClFile.exists()) {
+            javaHackClFile.writeText("package __gen.annotation; class Cl { @__gen.KotlinAptAnnotation boolean v; }")
+            project.getLogger().kotlinDebug("kapt: Java file stub generated: $javaHackClFile")
+        }
 
-        project.getLogger().kotlinDebug("kapt: Java file stub generated: $javaHackClFile")
-        javaTask.source(javaAptSourceDir)
+        if (!javaTask.source.contains(javaHackClFile)) {
+            javaTask.source(javaAptSourceDir)
+        }
     }
 
     private fun appendAnnotationsFileLocationArgument() {

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

@@ -613,6 +613,7 @@ private fun Project.initKapt(
 
     javaTask.doFirst {
         kaptManager.setupKapt()
+        kaptManager.generateJavaHackFile()
     }
 
     javaTask.doLast {

libraries/tools/kotlin-gradle-plugin/src/test/kotlin/org/jetbrains/kotlin/gradle/KotlinGradlePluginIT.kt

@@ -99,7 +99,9 @@ class KotlinGradleIT: BaseGradleIT() {
     }
 
     Test fun testKaptSimple() {
-        Project("kaptSimple", "1.12").build("build") {
+        val project = Project("kaptSimple", "1.12")
+
+        project.build("build") {
             assertSuccessful()
             assertContains("kapt: Class file stubs are not used")
             assertContains(":compileKotlin")
@@ -109,10 +111,16 @@ class KotlinGradleIT: BaseGradleIT() {
             assertFileExists("build/classes/main/example/TestClass.class")
             assertFileExists("build/classes/main/example/TestClassGenerated.class")
         }
+
+        project.build("build") {
+            assertSuccessful()
+        }
     }
 
     Test fun testKaptStubs() {
-        Project("kaptStubs", "1.12").build("build") {
+        val project = Project("kaptStubs", "1.12")
+
+        project.build("build") {
             assertSuccessful()
             assertContains("kapt: Using class file stubs")
             assertContains(":compileKotlin")
@@ -122,6 +130,10 @@ class KotlinGradleIT: BaseGradleIT() {
             assertFileExists("build/classes/main/example/TestClass.class")
             assertFileExists("build/classes/main/example/TestClassGenerated.class")
         }
+
+        project.build("build") {
+            assertSuccessful()
+        }
     }
 
     Test fun testKaptArguments() {

libraries/tools/kotlin-gradle-plugin/src/test/resources/testProject/kaptSimple/src/main/java/javaPackage/JavaClass.java

@@ -0,0 +1,25 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package javaPackage;
+
+public class JavaClass {
+
+    public void test() {
+        System.out.println(example.TestClassGenerated.class.getName());
+    }
+
+}