Fix NetBeans 8.x compile-on-save issue.

src/core/lombok/javac/apt/LombokProcessor.java

@@ -173,7 +173,10 @@ public class LombokProcessor extends AbstractProcessor {
 				filerFileManagerField.setAccessible(true);
 				filerFileManagerField.set(javacFiler, newFilerManager);
 
-				replaceFileManagerJdk9(context, newFilerManager);
+				if (lombok.javac.Javac.getJavaCompilerVersion() > 8
+						&& !lombok.javac.handlers.JavacHandlerUtil.inNetbeansCompileOnSave(context)) {
+					replaceFileManagerJdk9(context, newFilerManager);
+				}
 			}
 		} catch (Exception e) {
 			throw Lombok.sneakyThrow(e);

src/core/lombok/javac/handlers/JavacHandlerUtil.java

@@ -134,11 +134,16 @@ public class JavacHandlerUtil {
 		return inNetbeansEditor(node.getContext());
 	}
 	
-	private static boolean inNetbeansEditor(Context context) {
+	public static boolean inNetbeansEditor(Context context) {
 		Options options = Options.instance(context);
 		return (options.keySet().contains("ide") && !options.keySet().contains("backgroundCompilation"));
 	}
-	
+
+	public static boolean inNetbeansCompileOnSave(Context context) {
+		Options options = Options.instance(context);
+		return (options.keySet().contains("ide") && options.keySet().contains("backgroundCompilation"));
+	}
+
 	public static JCTree getGeneratedBy(JCTree node) {
 		return JCTree_generatedNode.get(node);
 	}