---

title: Basic Serialization sidebar_position: 1 id: basic-serialization license: | Licensed to the Apache Software Foundation (ASF) under one or more contributor license agreements. See the NOTICE file distributed with this work for additional information regarding copyright ownership. The ASF licenses this file to You under the Apache License, Version 2.0 (the “License”); you may not use this file except in compliance with the License. You may obtain a copy of the License at

 http://www.apache.org/licenses/LICENSE-2.0

Unless required by applicable law or agreed to in writing, software distributed under the License is distributed on an “AS IS” BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for the specific language governing permissions and limitations under the License.

Xlang is the default serialization mode for Fory Kotlin. This page covers the basic serialization API and interoperability rules for that default mode.

Cross-Language Interoperability

The following sections cover model generation, registration, and cross-language round trips in the default xlang mode.

Kotlin xlang serialization uses the JVM Fory implementation through ForyKotlin. Use it when Kotlin payloads must be read by another supported Fory implementation. Register portable model types with the same identity and field schema on every peer.

Kotlin data classes, enums, and sealed-class models use the Kotlin integration and generated serializers where applicable. Exact portable carrier mappings remain defined by the xlang type mapping.

Create a Fory Instance

import org.apache.fory.kotlin.ForyKotlin

val fory = ForyKotlin.builder()
    .withXlang(true)
    .build()

First round trip

import org.apache.fory.ThreadSafeFory
import org.apache.fory.kotlin.ForyKotlin

data class Person(val name: String, val age: Int)

fun main() {
    val fory: ThreadSafeFory = ForyKotlin.builder()
        .withXlang(true)
        .requireClassRegistration(true)
        .buildThreadSafeFory()
    fory.register(Person::class.java)

    val bytes = fory.serialize(Person("chaokunyang", 28))
    val result = fory.deserialize(bytes) as Person
    println("${result.name} ${result.age}")
}