From 9d98bbcc04bc3e71fb796a026986e90e02d59f9c Mon Sep 17 00:00:00 2001
From: Dmitry Batkovich <dmitry.batkovich@jetbrains.com>
Date: Thu, 23 Apr 2015 16:58:44 +0300
Subject: [PATCH] SuperClassHasFrequentlyUsedInheritorsInspection: class cast
 exception fixed (EA-57525)

---
 ...perClassHasFrequentlyUsedInheritorsInspection.java | 11 ++++++-----
 1 file changed, 6 insertions(+), 5 deletions(-)

diff --git a/java/java-analysis-impl/src/com/intellij/codeInspection/inheritance/SuperClassHasFrequentlyUsedInheritorsInspection.java b/java/java-analysis-impl/src/com/intellij/codeInspection/inheritance/SuperClassHasFrequentlyUsedInheritorsInspection.java
index b8a838a1854a..79901ed1c3e3 100644
--- a/java/java-analysis-impl/src/com/intellij/codeInspection/inheritance/SuperClassHasFrequentlyUsedInheritorsInspection.java
+++ b/java/java-analysis-impl/src/com/intellij/codeInspection/inheritance/SuperClassHasFrequentlyUsedInheritorsInspection.java
@@ -95,11 +95,12 @@ public class SuperClassHasFrequentlyUsedInheritorsInspection extends BaseJavaBat
     if (extendsList != null) {
       final PsiJavaCodeReferenceElement[] referenceElements = extendsList.getReferenceElements();
       if (referenceElements.length == 1) {
-        PsiClass returnClass = (PsiClass)referenceElements[0].resolve();
-        if (returnClass != null &&
-            !CommonClassNames.JAVA_LANG_OBJECT.equals(returnClass.getQualifiedName()) &&
-            !returnClass.isInterface()) {
-          return returnClass;
+        final PsiElement resolved = referenceElements[0].resolve();
+        if (resolved instanceof PsiClass) {
+          PsiClass returnClass = (PsiClass)resolved;
+          if (!CommonClassNames.JAVA_LANG_OBJECT.equals(returnClass.getQualifiedName()) && !returnClass.isInterface()) {
+            return returnClass;
+          }
         }
       }
     }