java: don't complete non-annotation-methods inside incorrect annotation

java/java-impl/src/com/intellij/codeInsight/completion/JavaCompletionContributor.java

@@ -594,7 +594,7 @@ public class JavaCompletionContributor extends CompletionContributor {
       addAllClasses(parameters, result, new JavaCompletionSession(result));
     }
 
-    if (annoClass != null) {
+    if (annoClass != null && annoClass.isAnnotationType()) {
       final PsiNameValuePair[] existingPairs = parameterList.getAttributes();
 
       methods: for (PsiMethod method : annoClass.getMethods()) {

java/java-tests/testData/codeInsight/completion/normal/NoNonAnnotationMethods.java

@@ -0,0 +1,3 @@
+class X {
+  @String(<caret>)
+}

java/java-tests/testSrc/com/intellij/java/codeInsight/completion/NormalCompletionTest.groovy

@@ -1844,4 +1844,6 @@ class Bar {{
     assert myFixture.lookupElementStrings == null
   }
 
+  void testNoNonAnnotationMethods() { doAntiTest() }
+
 }