Better diagnostics in injector generator

generators/injector-generator/src/org/jetbrains/kotlin/generators/di/Dependencies.java

@@ -158,14 +158,25 @@ public class Dependencies {
         // Find arguments
         ConstructorCall dependency = new ConstructorCall(publicConstructor);
         Type[] parameterTypes = publicConstructor.getGenericParameterTypes();
-        for (Type parameterType : parameterTypes) {
-            Field fieldForParameter = findDependencyOfType(
-                    DiType.fromReflectionType(parameterType),
-                    "constructor: " + publicConstructor + ", parameter: " + parameterType,
-                    neededFor.prepend(field)
+        try {
+            for (Type parameterType : parameterTypes) {
+                Field fieldForParameter = findDependencyOfType(
+                        DiType.fromReflectionType(parameterType),
+                        "constructor: " + publicConstructor + ", parameter: " + parameterType,
+                        neededFor.prepend(field)
+                );
+                used.add(fieldForParameter);
+                dependency.getConstructorArguments().add(fieldForParameter);
+            }
+        }
+        catch (InstantiationFailedException e) {
+            throw e;
+        }
+        catch (RuntimeException e) {
+            throw new InstantiationFailedException(
+                    "Could not instantiate '" + field + "' by calling " + publicConstructor + "\nneeded for " + neededFor,
+                    e
             );
-            used.add(fieldForParameter);
-            dependency.getConstructorArguments().add(fieldForParameter);
         }
 
         field.setInitialization(dependency);

generators/injector-generator/src/org/jetbrains/kotlin/generators/di/InstantiationFailedException.java

@@ -0,0 +1,23 @@
+/*
+ * Copyright 2010-2015 JetBrains s.r.o.
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+package org.jetbrains.kotlin.generators.di;
+
+public class InstantiationFailedException extends RuntimeException {
+    public InstantiationFailedException(String message, Throwable cause) {
+        super(message, cause);
+    }
+}