Added test for interface problem reported in #281 comments and patched

common/schema-builder/src/main/java/io/smallrye/graphql/schema/creator/ReferenceCreator.java

@@ -397,8 +397,8 @@ private void putIfAbsent(String key, Reference reference, ReferenceType referenc
                 String newClass = reference.getClassName();
                 if (!existingClass.equals(newClass)) {
                     throw new SchemaBuilderException(
-                            "Classes " + existingClass + " and " + newClass + " map to the same GraphQL type '" + key + "', " +
-                                    "consider using the @Name annotation or a different naming strategy to distinguish between them");
+                            "Classes " + existingClass + " and " + newClass + " map to the same GraphQL type '" + key + "', "
+                                    + "consider using the @Name annotation or a different naming strategy to distinguish between them");
                 }
             }
         }

common/schema-builder/src/test/java/io/smallrye/graphql/schema/test_generics/ClassFromInterfaceWithOneGenericsListParam.java

@@ -0,0 +1,17 @@
+package io.smallrye.graphql.schema.test_generics;
+
+import java.util.List;
+
+public class ClassFromInterfaceWithOneGenericsListParam implements InterfaceWithOneGenericsListParam<ClassWithoutGenerics> {
+
+    @Override
+    public List<ClassWithoutGenerics> getInstance() {
+        return null;
+    }
+
+    @Override
+    public String getName() {
+        return "name";
+    }
+
+}

common/schema-builder/src/test/java/io/smallrye/graphql/schema/test_generics/ControllerWithGenerics.java

@@ -128,6 +128,12 @@ public ClassWithOneGenericsParamFromInterface<Long>[] getArrayOfClassWithOneGene
         return null;
     }
 
+    //error #??? reproducer
+    @Query
+    public ClassFromInterfaceWithOneGenericsListParam getClassFromInterfaceWithOneGenericsListParam() {
+        return null;
+    }
+
     @Mutation
     public InterfaceWithOneGenericsParam<String> setClassWithOneGenericsParamInControllerStringReturnInterface(
             ClassWithOneGenericsParam<String> param1) {

common/schema-builder/src/test/java/io/smallrye/graphql/schema/test_generics/InterfaceWithOneGenericsListParam.java

@@ -0,0 +1,11 @@
+package io.smallrye.graphql.schema.test_generics;
+
+import java.util.List;
+
+public interface InterfaceWithOneGenericsListParam<T> {
+
+    List<T> getInstance();
+
+    String getName();
+
+}