#656 Support non-public datafetcher methods

graphql-dgs/src/main/kotlin/com/netflix/graphql/dgs/internal/DataFetcherInvoker.kt

@@ -116,6 +116,7 @@ class DataFetcherInvoker(
 
             launch.asCompletableFuture()
         } else {
+            ReflectionUtils.makeAccessible(method)
             ReflectionUtils.invokeMethod(method, dgsComponent, *args.toTypedArray())
         }
     }

graphql-dgs/src/main/kotlin/com/netflix/graphql/dgs/internal/DgsSchemaProvider.kt

@@ -29,8 +29,17 @@ import graphql.execution.DataFetcherExceptionHandler
 import graphql.language.InterfaceTypeDefinition
 import graphql.language.TypeName
 import graphql.language.UnionTypeDefinition
-import graphql.schema.*
-import graphql.schema.idl.*
+import graphql.schema.Coercing
+import graphql.schema.DataFetcher
+import graphql.schema.FieldCoordinates
+import graphql.schema.GraphQLCodeRegistry
+import graphql.schema.GraphQLScalarType
+import graphql.schema.GraphQLSchema
+import graphql.schema.idl.RuntimeWiring
+import graphql.schema.idl.SchemaDirectiveWiring
+import graphql.schema.idl.SchemaParser
+import graphql.schema.idl.TypeDefinitionRegistry
+import graphql.schema.idl.TypeRuntimeWiring
 import graphql.schema.visibility.DefaultGraphqlFieldVisibility
 import graphql.schema.visibility.GraphqlFieldVisibility
 import org.slf4j.Logger
@@ -188,8 +197,7 @@ class DgsSchemaProvider(
     ) {
         dgsComponents.forEach { dgsComponent ->
             val javaClass = AopUtils.getTargetClass(dgsComponent)
-
-            javaClass.methods.asSequence()
+            ReflectionUtils.getUniqueDeclaredMethods(javaClass).asSequence()
                 .filter { method ->
                     MergedAnnotations.from(method, MergedAnnotations.SearchStrategy.TYPE_HIERARCHY)
                         .isPresent(DgsData::class.java)

graphql-dgs/src/test/kotlin/com/netflix/graphql/dgs/DgsSchemaProviderTest.kt

@@ -170,6 +170,62 @@ internal class DgsSchemaProviderTest {
         verify { applicationContextMock.getBeansWithAnnotation(DgsComponent::class.java) }
     }
 
+    @Test
+    fun addPrivateFetchers() {
+        val fetcher = object : Any() {
+            @DgsData(parentType = "Query", field = "hello")
+            private fun someFetcher(dfe: DataFetchingEnvironment): String {
+                return "Hello"
+            }
+        }
+
+        every { applicationContextMock.getBeansWithAnnotation(DgsComponent::class.java) } returns mapOf(
+            Pair(
+                "helloFetcher",
+                fetcher
+            )
+        )
+        every { applicationContextMock.getBeansWithAnnotation(DgsScalar::class.java) } returns emptyMap()
+        every { applicationContextMock.getBeansWithAnnotation(DgsDirective::class.java) } returns emptyMap()
+
+        val provider = DgsSchemaProvider(applicationContextMock, Optional.empty(), Optional.empty(), Optional.empty())
+        val schema = provider.schema()
+        val build = GraphQL.newGraphQL(schema).build()
+        assertHello(build)
+
+        verify { applicationContextMock.getBeansWithAnnotation(DgsComponent::class.java) }
+    }
+
+    open class BaseClassFetcher {
+        @DgsData(parentType = "Query", field = "hello")
+        private fun someFetcher(dfe: DataFetchingEnvironment): String {
+            return "Hello"
+        }
+    }
+
+    @Test
+    fun addSubClassFetchers() {
+        val fetcher = object : BaseClassFetcher() {
+            // We're only interested in the base class for this test
+        }
+
+        every { applicationContextMock.getBeansWithAnnotation(DgsComponent::class.java) } returns mapOf(
+            Pair(
+                "helloFetcher",
+                fetcher
+            )
+        )
+        every { applicationContextMock.getBeansWithAnnotation(DgsScalar::class.java) } returns emptyMap()
+        every { applicationContextMock.getBeansWithAnnotation(DgsDirective::class.java) } returns emptyMap()
+
+        val provider = DgsSchemaProvider(applicationContextMock, Optional.empty(), Optional.empty(), Optional.empty())
+        val schema = provider.schema()
+        val build = GraphQL.newGraphQL(schema).build()
+        assertHello(build)
+
+        verify { applicationContextMock.getBeansWithAnnotation(DgsComponent::class.java) }
+    }
+
     @Test
     fun addDefaultTypeResolvers() {
         val schema = """