Merge remote-tracking branch 'origin/graphql-java-kickstart#407' into g…

…raphql-java-kickstart#407

# Conflicts:
#	src/main/kotlin/graphql/kickstart/tools/SchemaParser.kt
#	src/test/groovy/graphql/kickstart/tools/FieldResolverScannerSpec.groovy

src/test/groovy/graphql/kickstart/tools/BaseDevice.java

@@ -0,0 +1,5 @@
+package graphql.kickstart.tools;
+
+public interface BaseDevice {
+    BaseMeta getMeta();
+}

src/test/groovy/graphql/kickstart/tools/BaseMeta.java

@@ -0,0 +1,3 @@
+package graphql.kickstart.tools;
+
+public interface BaseMeta {}

src/test/groovy/graphql/kickstart/tools/SchemaParserSpec.groovy

@@ -368,6 +368,50 @@ class SchemaParserSpec extends Specification {
         noExceptionThrown()
     }
 
+    def "allow circular relations in input objects"() {
+        when:
+        SchemaParser.newParser().schemaString('''\
+            input A {
+                id: ID!
+                b: B
+            }
+            input B {
+                id: ID!
+                a: A
+            }
+            input C {
+                id: ID!
+                c: C
+            }
+            type Query {}
+            type Mutation {
+                test(input: A!): Boolean
+                testC(input: C!): Boolean
+            }
+            '''.stripIndent())
+        .resolvers(new GraphQLMutationResolver() {
+            static class A {
+                String id;
+                B b;
+            }
+            static class B {
+                String id;
+                A a;
+            }
+            static class C {
+                String id;
+                C c;
+            }
+            boolean test(A a) { return true }
+            boolean testC(C c) { return true }
+        }, new GraphQLQueryResolver() {})
+        .build()
+        .makeExecutableSchema()
+
+        then:
+        noExceptionThrown()
+    }
+
     enum EnumType {
         TEST
     }