Issue 559: NullPointerException when @NonNull is used in abstract method

- Prevent NPE in javac and give a proper warning in both eclipse and javac
- Add test cases

1 files changed, 5 insertions, 0 deletions

diff --git a/src/core/lombok/eclipse/handlers/NonNullHandler.java b/src/core/lombok/eclipse/handlers/NonNullHandler.java
index 5c58069c..59fda801 100644
--- a/src/core/lombok/eclipse/handlers/NonNullHandler.java
+++ b/src/core/lombok/eclipse/handlers/NonNullHandler.java
@@ -82,6 +82,11 @@ public class NonNullHandler extends EclipseAnnotationHandler<NonNull> {
 		
 		if (isGenerated(declaration)) return;
 		
+		if (declaration.isAbstract()) {
+			annotationNode.addWarning("@NonNull is meaningless on a parameter of an abstract method.");
+			return;
+		}
+
 		// Possibly, if 'declaration instanceof ConstructorDeclaration', fetch declaration.constructorCall, search it for any references to our parameter,
 		// and if they exist, create a new method in the class: 'private static <T> T lombok$nullCheck(T expr, String msg) {if (expr == null) throw NPE; return expr;}' and
 		// wrap all references to it in the super/this to a call to this method.