2 files changed, 57 insertions, 31 deletions

diff --git a/src/core/lombok/core/AnnotationProcessor.java b/src/core/lombok/core/AnnotationProcessor.java
index d05597b6..04448ecb 100644
--- a/src/core/lombok/core/AnnotationProcessor.java
+++ b/src/core/lombok/core/AnnotationProcessor.java
@@ -49,6 +49,7 @@ import lombok.patcher.ClassRootFinder;
 
 @SupportedAnnotationTypes("*")
 public class AnnotationProcessor extends AbstractProcessor {
+
 	private static String trace(Throwable t) {
 		StringWriter w = new StringWriter();
 		t.printStackTrace(new PrintWriter(w, true));
@@ -71,18 +72,33 @@ public class AnnotationProcessor extends AbstractProcessor {
 	 * the delegate ProcessingEnvironment of the gradle wrapper is returned.
 	 */
 	public static ProcessingEnvironment getJavacProcessingEnvironment(ProcessingEnvironment procEnv, List<String> delayedWarnings) {
-		final Class<? extends ProcessingEnvironment> procEnvClass = procEnv.getClass();
-		if (procEnvClass.getName().equals("org.gradle.api.internal.tasks.compile.processing.IncrementalProcessingEnvironment")) {
+		ProcessingEnvironment javacProcEnv = tryRecursivelyObtainJavacProcessingEnvironment(procEnv);
+
+		if (javacProcEnv == null) {
+			delayedWarnings.add("Can't get the delegate of the gradle IncrementalProcessingEnvironment.");
+		}
+
+		return javacProcEnv;
+	}
+
+	private static ProcessingEnvironment tryRecursivelyObtainJavacProcessingEnvironment(ProcessingEnvironment procEnv) {
+		if (procEnv.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment")) {
+			return procEnv;
+		}
+
+		for (Class<?> procEnvClass = procEnv.getClass(); procEnvClass != null; procEnvClass = procEnvClass.getSuperclass()) {
 			try {
 				Field field = procEnvClass.getDeclaredField("delegate");
 				field.setAccessible(true);
 				Object delegate = field.get(procEnv);
-				return (ProcessingEnvironment) delegate;
+
+				return tryRecursivelyObtainJavacProcessingEnvironment((ProcessingEnvironment) delegate);
 			} catch (final Exception e) {
-				delayedWarnings.add("Can't get the delegate of the gradle IncrementalProcessingEnvironment: " + trace(e));
+				// no valid delegate, try superclass
 			}
 		}
-		return procEnv;
+
+		return null;
 	}
 
 	
@@ -96,7 +112,7 @@ public class AnnotationProcessor extends AbstractProcessor {
 		@Override boolean want(ProcessingEnvironment procEnv, List<String> delayedWarnings) {
 			ProcessingEnvironment javacProcEnv = getJavacProcessingEnvironment(procEnv, delayedWarnings);
 
-			if (!javacProcEnv.getClass().getName().equals("com.sun.tools.javac.processing.JavacProcessingEnvironment")) return false;
+			if (javacProcEnv == null) return false;
 
 			try {
 				ClassLoader classLoader = findAndPatchClassLoader(javacProcEnv);
diff --git a/src/core/lombok/javac/apt/LombokProcessor.java b/src/core/lombok/javac/apt/LombokProcessor.java
index fc457735..04b494bf 100644
--- a/src/core/lombok/javac/apt/LombokProcessor.java
+++ b/src/core/lombok/javac/apt/LombokProcessor.java
@@ -37,7 +37,6 @@ import java.util.Set;
 import java.util.SortedSet;
 
 import javax.annotation.processing.AbstractProcessor;
-import javax.annotation.processing.Filer;
 import javax.annotation.processing.Messager;
 import javax.annotation.processing.ProcessingEnvironment;
 import javax.annotation.processing.RoundEnvironment;
@@ -70,6 +69,7 @@ import com.sun.tools.javac.util.Context;
  */
 @SupportedAnnotationTypes("*")
 public class LombokProcessor extends AbstractProcessor {
+
 	private ProcessingEnvironment processingEnv;
 	private JavacProcessingEnvironment javacProcessingEnv;
 	private JavacFiler javacFiler;
@@ -409,42 +409,52 @@ public class LombokProcessor extends AbstractProcessor {
 	 * This class casts the given processing environment to a JavacProcessingEnvironment. In case of
 	 * gradle incremental compilation, the delegate ProcessingEnvironment of the gradle wrapper is returned.
 	 */
-	public JavacProcessingEnvironment getJavacProcessingEnvironment(ProcessingEnvironment procEnv) {
-		final Class<?> procEnvClass = procEnv.getClass();
-		if (procEnv.getClass().getName().equals("org.gradle.api.internal.tasks.compile.processing.IncrementalProcessingEnvironment")) {
+	public JavacProcessingEnvironment getJavacProcessingEnvironment(Object procEnv) {
+		if (procEnv instanceof JavacProcessingEnvironment) {
+			return (JavacProcessingEnvironment) procEnv;
+		}
+
+		// try to find a "delegate" field in the object, and use this to try to obtain a JavacProcessingEnvironment
+		for (Class<?> procEnvClass = procEnv.getClass(); procEnvClass != null; procEnvClass = procEnvClass.getSuperclass()) {
 			try {
-				Field field = procEnvClass.getDeclaredField("delegate");
-				field.setAccessible(true);
-				Object delegate = field.get(procEnv);
-				return (JavacProcessingEnvironment) delegate;
+				return getJavacProcessingEnvironment(tryGetDelegateField(procEnvClass, procEnv));
 			} catch (final Exception e) {
-				e.printStackTrace();
-				procEnv.getMessager().printMessage(Kind.WARNING,
-						"Can't get the delegate of the gradle IncrementalProcessingEnvironment. Lombok won't work.");
+				// delegate field was not found, try on superclass
 			}
 		}
-		return (JavacProcessingEnvironment) procEnv;
+
+		processingEnv.getMessager().printMessage(Kind.WARNING,
+				"Can't get the delegate of the gradle IncrementalProcessingEnvironment. Lombok won't work.");
+		return null;
 	}
 
 	/**
-	 * This class casts the given filer to a JavacFiler. In case of
-	 * gradle incremental compilation, the delegate Filer of the gradle wrapper is returned.
+	 * This class returns the given filer as a JavacFiler. In case the case that the filer is no
+	 * JavacFiler (e.g. the Gradle IncrementalFiler), its "delegate" field is used to get the JavacFiler
+	 * (directly or through a delegate field again)
 	 */
-	public JavacFiler getJavacFiler(Filer filer) {
-		final Class<?> filerSuperClass = filer.getClass().getSuperclass();
-		if (filerSuperClass.getName().equals("org.gradle.api.internal.tasks.compile.processing.IncrementalFiler")) {
+	public JavacFiler getJavacFiler(Object filer) {
+		if (filer instanceof JavacFiler) {
+			return (JavacFiler) filer;
+		}
+
+		// try to find a "delegate" field in the object, and use this to check for a JavacFiler
+		for (Class<?> filerClass = filer.getClass(); filerClass != null; filerClass = filerClass.getSuperclass()) {
 			try {
-				Field field = filerSuperClass.getDeclaredField("delegate");
-				field.setAccessible(true);
-				Object delegate = field.get(filer);
-				return (JavacFiler) delegate;
+				return getJavacFiler(tryGetDelegateField(filerClass, filer));
 			} catch (final Exception e) {
-				e.printStackTrace();
-				processingEnv.getMessager().printMessage(Kind.WARNING,
-						"Can't get the delegate of the gradle IncrementalFiler. Lombok won't work.");
+				// delegate field was not found, try on superclass
 			}
 		}
-		return (JavacFiler) filer;
+
+		processingEnv.getMessager().printMessage(Kind.WARNING,
+				"Can't get a JavacFiler from " + filer.getClass().getName() + ". Lombok won't work.");
+		return null;
 	}
 
+	private Object tryGetDelegateField(Class<?> delegateClass, Object instance) throws Exception {
+		Field field = delegateClass.getDeclaredField("delegate");
+		field.setAccessible(true);
+		return field.get(instance);
+	}
 }