Fix compatibility issues with Android Gradle plugin 1.2

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

@@ -365,7 +365,7 @@ open class KotlinAndroidPlugin [Inject] (val scriptHandler: ScriptHandler, val t
             val variantDataName = variantData.getName()
             logger.kotlinDebug("Process variant [$variantDataName]")
 
-            val javaTask = variantData.javaCompileTask
+            val javaTask = AndroidGradleWrapper.getJavaCompile(variantData)
 
             val kotlinTaskName = "compile${variantDataName.capitalize()}Kotlin"
             val kotlinTask = tasksProvider.createKotlinJVMTask(project, kotlinTaskName)
@@ -432,12 +432,16 @@ open class KotlinAndroidPlugin [Inject] (val scriptHandler: ScriptHandler, val t
 
             javaTask.dependsOn(kotlinTaskName)
 
-            val kaptManager = AnnotationProcessingManager(kotlinTask, javaTask, aptFiles.toSet(), aptOutputDir, aptWorkingDir)
-            kotlinTask.storeKaptAnnotationsFile(kaptManager)
+            val kaptManager = if (javaTask is JavaCompile) {
+                val manager = AnnotationProcessingManager(kotlinTask, javaTask, aptFiles.toSet(), aptOutputDir, aptWorkingDir)
+                kotlinTask.storeKaptAnnotationsFile(manager)
+                manager
+            }
+            else null
 
             javaTask doFirst {
                 javaTask.setClasspath(javaTask.getClasspath() + project.files(kotlinTask.property("kotlinDestinationDir")))
-                kaptManager.setupKapt()
+                kaptManager?.setupKapt()
             }
         }
     }

libraries/tools/kotlin-gradle-plugin/src/main/kotlin/org/jetbrains/kotlin/gradle/plugin/android/AndroidGradleWrapper.groovy

@@ -6,6 +6,7 @@ import com.android.build.gradle.api.ApkVariant
 import com.android.build.gradle.api.BaseVariant
 import com.android.build.gradle.api.TestVariant
 import org.gradle.api.internal.DefaultDomainObjectSet
+import org.gradle.api.tasks.compile.AbstractCompile
 import org.gradle.api.tasks.util.PatternFilterable
 import org.jetbrains.annotations.NotNull
 
@@ -43,6 +44,11 @@ class AndroidGradleWrapper {
     return variant.getBuildType().getName()
   }
 
+  @NotNull
+  static def AbstractCompile getJavaCompile(Object baseVariantData) {
+    return baseVariantData.javaCompileTask
+  }
+
   @NotNull
   static def Set<File> getJavaSrcDirs(Object androidSourceSet) {
     return androidSourceSet.getJava().getSrcDirs()