AIOOBE (IDEA-173816)

plugins/IntentionPowerPak/src/com/siyeh/ipp/functional/ExtractToMethodReferenceIntention.java

@@ -130,7 +130,7 @@ public class ExtractToMethodReferenceIntention extends BaseElementAtCaretIntenti
                                                                   targetMethodName + parameters, targetClass);
       PsiCodeBlock targetMethodBody = emptyMethod.getBody();
       LOG.assertTrue(targetMethodBody != null);
-      targetMethodBody.addRange(elements[0], elements[elements.length - 1]);
+      if (elements.length > 0) targetMethodBody.addRange(elements[0], elements[elements.length - 1]);
 
       PsiMethod method = (PsiMethod)CodeStyleManager.getInstance(project).reformat(JavaCodeStyleManager.getInstance(project).shortenClassReferences(targetClass.add(emptyMethod)));
       PsiMethodReferenceExpression methodReference =

plugins/IntentionPowerPak/test/com/siyeh/ipp/functional/extractToMethodReference/EmptyCodeBlock.java

@@ -0,0 +1,5 @@
+class B {
+  {
+    Runnable r = () <caret>-> {} ;
+  }
+}

plugins/IntentionPowerPak/test/com/siyeh/ipp/functional/extractToMethodReference/EmptyCodeBlock_after.java

@@ -0,0 +1,8 @@
+class B {
+  {
+    Runnable r = B::run;
+  }
+
+    private static void run() {
+    }
+}

plugins/IntentionPowerPak/testSrc/com/siyeh/ipp/functional/ExtractToMethodReferenceTest.java

@@ -54,6 +54,10 @@ public class ExtractToMethodReferenceTest extends IPPTestCase {
     assertIntentionNotAvailable();
   }
 
+  public void testEmptyCodeBlock() throws Exception {
+    doTest();
+  }
+
   public void testUsedLocalVariables() throws Exception {
     assertIntentionNotAvailable();
   }