From 245a4f079cc2358d4c7810adcf555dbe81a08979 Mon Sep 17 00:00:00 2001
From: Stepan Koltsov <stepan.koltsov@jetbrains.com>
Date: Thu, 15 Mar 2012 00:14:18 +0400
Subject: [PATCH] better message when dependency is interface

---
 .../src/org/jetbrains/jet/di/DependencyInjectorGenerator.java | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/injector-generator/src/org/jetbrains/jet/di/DependencyInjectorGenerator.java b/injector-generator/src/org/jetbrains/jet/di/DependencyInjectorGenerator.java
index 8a87183e19c..5533e8554e4 100644
--- a/injector-generator/src/org/jetbrains/jet/di/DependencyInjectorGenerator.java
+++ b/injector-generator/src/org/jetbrains/jet/di/DependencyInjectorGenerator.java
@@ -339,6 +339,10 @@ public class DependencyInjectorGenerator {
     private void initializeByConstructorCall(Field field, Field neededFor) {
         Class<?> type = field.getType();
 
+        if (type.isInterface()) {
+            throw new IllegalArgumentException("cannot instantiate interface: " + type.getName() + " needed for " + neededFor);
+        }
+
         // Look for constructor
         Constructor<?>[] constructors = type.getConstructors();
         if (constructors.length == 0 || !Modifier.isPublic(constructors[0].getModifiers())) {