update javadoc for serialize/parseValue

andimarek · andimarek · commit 0779d314c6de · 2017-05-24T17:41:32.000+02:00
diff --git a/src/main/java/graphql/schema/Coercing.java b/src/main/java/graphql/schema/Coercing.java
@@ -11,7 +11,8 @@ public interface Coercing<I, O> {
      * Called to convert a result of a DataFetcher to a valid runtime value.
      *
      * @param input is never null
-     * @return null if not possible/invalid
+     * @return never null
+     * @throws graphql.GraphQLException if value input can't be serialized
      */
     O serialize(Object input);
 
@@ -20,7 +21,8 @@ public interface Coercing<I, O> {
      * Null if not possible.
      *
      * @param input is never null
-     * @return null if not possible/invalid
+     * @return never null
+     * @throws graphql.GraphQLException if value input can't be serialized
      */
     I parseValue(Object input);
 
