@@ -68,7 +68,18 @@ static Object valueToLiteralImpl(GraphqlFieldVisibility fieldVisibility,
             if (valueMode == NORMALIZED) {
                 return assertShouldNeverHappen("can't infer normalized structure");
             }
-            return ValuesResolverLegacy.valueToLiteralLegacy(inputValueWithState.getValue(), type, graphqlContext, locale);
+
+            Value<?> value = ValuesResolverLegacy.valueToLiteralLegacy(
+                    inputValueWithState.getValue(),
+                    type,
+                    graphqlContext,
+                    locale);
+            //
+            // the valueToLiteralLegacy() nominally cant know if null means never set or is set to a null value
+            // but this code can know - its is SET to a value so, it MUST be a Null Literal
+            // this method would assert at the end of it if inputValueWithState.isNotSet() were true
+            //
+            return value == null ? NullValue.of() : value;
         }
         if (inputValueWithState.isLiteral()) {
             return inputValueWithState.getValue();
 
@@ -1,5 +1,6 @@
 package graphql.introspection
 
+
 import graphql.TestUtil
 import graphql.schema.DataFetcher
 import graphql.schema.FieldCoordinates
@@ -438,7 +439,7 @@ class IntrospectionTest extends Specification {
 
     def "test AST printed introspection query is equivalent to original string"() {
         when:
-            def oldIntrospectionQuery = "\n" +
+        def oldIntrospectionQuery = "\n" +
                 "  query IntrospectionQuery {\n" +
                 "    __schema {\n" +
                 "      queryType { name }\n" +
@@ -540,12 +541,11 @@ class IntrospectionTest extends Specification {
                 "  }\n" +
                 "\n"
 
-            def newIntrospectionQuery = IntrospectionQuery.INTROSPECTION_QUERY;
+        def newIntrospectionQuery = IntrospectionQuery.INTROSPECTION_QUERY
 
         then:
-            oldIntrospectionQuery.replaceAll("\\s+","").equals(
-                newIntrospectionQuery.replaceAll("\\s+","")
-            )
+        oldIntrospectionQuery.replaceAll("\\s+", "") ==
+                newIntrospectionQuery.replaceAll("\\s+", "")
     }
 
     def "test parameterized introspection queries"() {
@@ -582,44 +582,66 @@ class IntrospectionTest extends Specification {
 
         def parseExecutionResult = {
             [
-                it.data["__schema"]["types"].find{it["name"] == "Query"}["fields"].find{it["name"] == "notDeprecated"}["description"] != null, // descriptions is true
-                it.data["__schema"]["types"].find{it["name"] == "UUID"}["specifiedByURL"] != null, // specifiedByUrl is true
-                it.data["__schema"]["directives"].find{it["name"] == "repeatableDirective"}["isRepeatable"] != null, // directiveIsRepeatable is true
-                it.data["__schema"]["description"] != null, // schemaDescription is true
-                it.data["__schema"]["types"].find { it['name'] == 'InputType' }["inputFields"].find({ it["name"] == "inputField" }) != null // inputValueDeprecation is true
+                    it.data["__schema"]["types"].find { it["name"] == "Query" }["fields"].find { it["name"] == "notDeprecated" }["description"] != null, // descriptions is true
+                    it.data["__schema"]["types"].find { it["name"] == "UUID" }["specifiedByURL"] != null, // specifiedByUrl is true
+                    it.data["__schema"]["directives"].find { it["name"] == "repeatableDirective" }["isRepeatable"] != null, // directiveIsRepeatable is true
+                    it.data["__schema"]["description"] != null, // schemaDescription is true
+                    it.data["__schema"]["types"].find { it['name'] == 'InputType' }["inputFields"].find({ it["name"] == "inputField" }) != null // inputValueDeprecation is true
             ]
         }
 
         when:
-            def allFalseExecutionResult = graphQL.execute(
+        def allFalseExecutionResult = graphQL.execute(
                 IntrospectionQueryBuilder.build(
-                    IntrospectionQueryBuilder.Options.defaultOptions()
-                        .descriptions(false)
-                        .specifiedByUrl(false)
-                        .directiveIsRepeatable(false)
-                        .schemaDescription(false)
-                        .inputValueDeprecation(false)
-                        .typeRefFragmentDepth(5)
+                        IntrospectionQueryBuilder.Options.defaultOptions()
+                                .descriptions(false)
+                                .specifiedByUrl(false)
+                                .directiveIsRepeatable(false)
+                                .schemaDescription(false)
+                                .inputValueDeprecation(false)
+                                .typeRefFragmentDepth(5)
                 )
-            )
+        )
         then:
-            !parseExecutionResult(allFalseExecutionResult).any()
-            allFalseExecutionResult.data["__schema"]["types"].find{it["name"] == "Query"}["fields"].find{it["name"] == "tenDimensionalList"}["type"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"] == null // typeRefFragmentDepth is 5
+        !parseExecutionResult(allFalseExecutionResult).any()
+        allFalseExecutionResult.data["__schema"]["types"].find { it["name"] == "Query" }["fields"].find { it["name"] == "tenDimensionalList" }["type"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"] == null // typeRefFragmentDepth is 5
 
         when:
-            def allTrueExecutionResult = graphQL.execute(
+        def allTrueExecutionResult = graphQL.execute(
                 IntrospectionQueryBuilder.build(
-                    IntrospectionQueryBuilder.Options.defaultOptions()
-                        .descriptions(true)
-                        .specifiedByUrl(true)
-                        .directiveIsRepeatable(true)
-                        .schemaDescription(true)
-                        .inputValueDeprecation(true)
-                        .typeRefFragmentDepth(7)
+                        IntrospectionQueryBuilder.Options.defaultOptions()
+                                .descriptions(true)
+                                .specifiedByUrl(true)
+                                .directiveIsRepeatable(true)
+                                .schemaDescription(true)
+                                .inputValueDeprecation(true)
+                                .typeRefFragmentDepth(7)
                 )
-            )
+        )
+        then:
+        parseExecutionResult(allTrueExecutionResult).every()
+        allTrueExecutionResult.data["__schema"]["types"].find { it["name"] == "Query" }["fields"].find { it["name"] == "tenDimensionalList" }["type"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"] == null // typeRefFragmentDepth is 7
+    }
+
+    def "issue 3285 - deprecated defaultValue on programmatic args prints AST literal as expected"() {
+        def queryObjType = newObject().name("Query")
+                .field(newFieldDefinition().name("f").type(GraphQLString)
+                        .argument(newArgument().name("arg").type(GraphQLString).defaultValue(null)))
+                .build()
+        def schema = newSchema().query(queryObjType).build()
+        def graphQL = newGraphQL(schema).build()
+
+
+        when:
+        def executionResult = graphQL.execute(IntrospectionQuery.INTROSPECTION_QUERY)
         then:
-            parseExecutionResult(allTrueExecutionResult).every()
-            allTrueExecutionResult.data["__schema"]["types"].find{it["name"] == "Query"}["fields"].find{it["name"] == "tenDimensionalList"}["type"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"]["ofType"] == null // typeRefFragmentDepth is 7
+        executionResult.errors.isEmpty()
+
+        def types = executionResult.data['__schema']['types'] as List
+        def queryType = types.find { it['name'] == 'Query' }
+        def fField = (queryType['fields'] as List)[0]
+        def arg = (fField['args'] as List)[0]
+        arg['name'] == "arg"
+        arg['defaultValue'] == "null" // printed AST
     }
 }
@@ -2247,6 +2247,24 @@ type Query {
 type TestObjectB {
   field: String
 }
+'''
+    }
+
+    def "issue 3285 - deprecated defaultValue on programmatic args prints as expected"() {
+        def queryObjType = newObject().name("Query")
+                .field(newFieldDefinition().name("f").type(GraphQLString)
+                        .argument(newArgument().name("arg").type(GraphQLString).defaultValue(null)))
+                .build()
+        def schema = GraphQLSchema.newSchema().query(queryObjType).build()
+
+
+        when:
+        def options = defaultOptions().includeDirectiveDefinitions(false)
+        def sdl = new SchemaPrinter(options).print(schema)
+        then:
+        sdl == '''type Query {
+  f(arg: String = null): String
+}
 '''
     }
 }