add @NotNull to some Enum methods (IDEA-192829)

java/java-tests/testData/inspection/nullableProblems/NonAnnotatedSiblingOverriding.java

@@ -17,3 +17,10 @@ abstract class ParamFail extends ParamBase implements <warning descr="Non-annota
 
 abstract class ParamFail2 extends ParamBase implements <warning descr="Non-null parameter 's' in method 'setString2' from 'ParamBase' should not override non-annotated parameter from 'NonAnnotatedInt'">NonAnnotatedInt</warning> { }
 
+
+interface NonNullEnum {
+  @NotNull
+  String name();
+}
+
+enum NonNullEnumImpl implements NonNullEnum {}

java/jdkAnnotations/java/lang/annotations.xml

@@ -82,6 +82,15 @@
       <val name="to" val="java.lang.Integer.MAX_VALUE"/>
     </annotation>
   </item>
+  <item name='java.lang.Enum java.lang.Class&lt;E&gt; getDeclaringClass()'>
+    <annotation name='org.jetbrains.annotations.NotNull'/>
+  </item>
+  <item name='java.lang.Enum java.lang.String name()'>
+        <annotation name='org.jetbrains.annotations.NotNull'/>
+    </item>
+  <item name='java.lang.Enum java.lang.String toString()'>
+    <annotation name='org.jetbrains.annotations.NotNull'/>
+  </item>
   <item name='java.lang.Integer int bitCount(int)'>
     <annotation name='org.jetbrains.annotations.Range'>
       <val name="from" val="0"/>