add javadoc intention should be unavailable if javadoc already exists IDEA-174275

java/java-impl/src/com/intellij/codeInsight/intention/impl/AddJavadocIntention.java

@@ -37,7 +37,9 @@ public class AddJavadocIntention extends BaseElementAtCaretIntentionAction imple
       return false;
     }
     final PsiElement parent = element.getParent();
-    return parent instanceof PsiDocCommentOwner && !(parent instanceof PsiTypeParameter);
+    return parent instanceof PsiDocCommentOwner &&
+           ((PsiDocCommentOwner)parent).getDocComment() == null &&
+           !(parent instanceof PsiTypeParameter);
   }
 
   @NotNull

java/java-tests/testData/codeInsight/addJavadoc/beforeJavadocAlreadyExists.java

@@ -0,0 +1,7 @@
+// "Add Javadoc" "false"
+/**
+ * javadoc
+ */
+class F<caret>oo {
+
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/intention/AddJavadocIntentionTest.java

@@ -17,9 +17,6 @@ package com.intellij.java.codeInsight.intention;
 
 import com.intellij.codeInsight.daemon.LightIntentionActionTestCase;
 
-/**
- * @author Dmitry Batkovich
- */
 public class AddJavadocIntentionTest extends LightIntentionActionTestCase {
 
   public void test() throws Exception { doAllTests(); }