diff --git a/server/implementation/src/main/java/io/smallrye/graphql/bootstrap/Bootstrap.java b/server/implementation/src/main/java/io/smallrye/graphql/bootstrap/Bootstrap.java
index f2d675272..ec9823faf 100644
--- a/server/implementation/src/main/java/io/smallrye/graphql/bootstrap/Bootstrap.java
+++ b/server/implementation/src/main/java/io/smallrye/graphql/bootstrap/Bootstrap.java
@@ -291,7 +291,7 @@ private void createGraphQLInterfaceType(InterfaceType interfaceType) {
         GraphQLInterfaceType graphQLInterfaceType = interfaceTypeBuilder.build();
         // To resolve the concrete class
         this.codeRegistryBuilder.typeResolver(graphQLInterfaceType, new InterfaceResolver(interfaceType));
-        this.interfaceMap.put(interfaceType.getClassName(), graphQLInterfaceType);
+        this.interfaceMap.put(interfaceType.getName(), graphQLInterfaceType);
     }
 
     private void createGraphQLInputObjectTypes() {
@@ -316,7 +316,7 @@ private void createGraphQLInputObjectType(InputType inputType) {
         }
 
         GraphQLInputObjectType graphQLInputObjectType = inputObjectTypeBuilder.build();
-        inputMap.put(inputType.getClassName(), graphQLInputObjectType);
+        inputMap.put(inputType.getName(), graphQLInputObjectType);
     }
 
     private void createGraphQLObjectTypes() {
@@ -369,15 +369,15 @@ private void createGraphQLObjectType(Type type) {
         if (type.hasInterfaces()) {
             Set<Reference> interfaces = type.getInterfaces();
             for (Reference i : interfaces) {
-                if (interfaceMap.containsKey(i.getClassName())) {
-                    GraphQLInterfaceType graphQLInterfaceType = interfaceMap.get(i.getClassName());
+                if (interfaceMap.containsKey(i.getName())) {
+                    GraphQLInterfaceType graphQLInterfaceType = interfaceMap.get(i.getName());
                     objectTypeBuilder = objectTypeBuilder.withInterface(graphQLInterfaceType);
                 }
             }
         }
 
         GraphQLObjectType graphQLObjectType = objectTypeBuilder.build();
-        typeMap.put(type.getClassName(), graphQLObjectType);
+        typeMap.put(type.getName(), graphQLObjectType);
 
         // Register this output for interface type resolving
         InterfaceOutputRegistry.register(type, graphQLObjectType);
diff --git a/server/implementation/src/test/java/io/smallrye/graphql/test/ClassWithOneGenericsParam.java b/server/implementation/src/test/java/io/smallrye/graphql/test/ClassWithOneGenericsParam.java
new file mode 100644
index 000000000..e59d1f724
--- /dev/null
+++ b/server/implementation/src/test/java/io/smallrye/graphql/test/ClassWithOneGenericsParam.java
@@ -0,0 +1,12 @@
+package io.smallrye.graphql.test;
+
+public class ClassWithOneGenericsParam<T> {
+
+    public T getParam1() {
+        return null;
+    }
+
+    public String getName() {
+        return null;
+    }
+}
diff --git a/server/implementation/src/test/java/io/smallrye/graphql/test/TestEndpoint.java b/server/implementation/src/test/java/io/smallrye/graphql/test/TestEndpoint.java
index aa2eaea38..947ceaa90 100644
--- a/server/implementation/src/test/java/io/smallrye/graphql/test/TestEndpoint.java
+++ b/server/implementation/src/test/java/io/smallrye/graphql/test/TestEndpoint.java
@@ -45,6 +45,18 @@ public List<String> listDefault(@DefaultValue("[\"electric\",\"blue\"]") List<St
         return values;
     }
 
+    // issue #429 reproducer part 1
+    @Query
+    public ClassWithOneGenericsParam<String> getGeneric1() {
+        return null;
+    }
+
+    // issue #429 reproducer part 2
+    @Query
+    public ClassWithOneGenericsParam<Integer> getGeneric2() {
+        return null;
+    }
+
     // This method will be ignored, with a WARN in the log, due to below duplicate
     @Name("timestamp")
     public TestSource getTestSource(@Source TestObject testObject, String indicator) {