---
title: "面向 JVM 后端的 Java 与 Kotlin 开发"
canonical: https://wavect.io/zh/services/java-kotlin-development/
language: zh
description: "在明确范围内改进 Java 与 Kotlin 后端，验证 API 契约、语言互操作、持久化，以及 JVM、构建和依赖兼容性。"
image: "https://wavect.io/img/general/bak/open_graph_preview.jpg"
---

Java 与 Kotlin 后端开发

# 修改 JVM 后端时，保留业务依赖的规则

现有 Java 或 Kotlin 服务的难点常在正常路径之外：来自 Java 的空值、未完成的数据库更新，或依赖升级后改变的序列化行为。我们先明确这些契约，再修改实现。

合作方式

## 保留调用方和已有数据依赖的规则。

1. **检查契约** 确认 API 行为、Java/Kotlin 边界及持久化规则。
2. **有依据地实施** 在兼容构建和有效回归检查下修改选定路径。
3. **验收与交接** 验证目标运行时，交付发布与恢复说明。

服务说明

Wavect 在 JVM 上实施明确范围的 Java 与 Kotlin 后端变更，进行契约、持久化和构建兼容性检查。框架支持与升级范围以实际代码库评估为准。

适合的情况

- 有明确变更需求的现有 Java 或 Kotlin 后端
- 需要处理 JVM 依赖或互操作风险的团队

其他需求

- 原生 Android 应用开发
- 预先假定需要完整重写

## 确认服务操作以及它的调用方

我们梳理受影响的接口或任务、身份验证、序列化、错误响应以及依赖这些行为的调用方。既有行为与目标变更会转化为明确验收条件。评估包括实际使用的框架和库；Java 或 Kotlin 并不自动代表采用 Spring。

本页负责 JVM 后端。原生 Android 界面与设备行为属于 [移动应用开发](/zh/services/mobile-apps/) 。

## 在 Java 与 Kotlin 的交界处检查空值

Kotlin 类型有助于表达值的缺失，但来自 Java 的平台类型仍需审查。 [Kotlin 互操作文档](https://kotlinlang.org/docs/java-interop.html) 说明了这个边界。我们检查受影响代码中的 DTO、集合、注解和异常行为。序列化与校验测试明确缺失、null 和非法值会怎样到达调用方。

## 让事务边界对应业务操作

我们确认哪些数据库变更必须一起完成、何时提交以及如何报告失败。范围可以包括查询修改、数据结构演进、事务测试和连接管理。隔离与重试行为取决于实际数据库、驱动和框架。数据库事务不会自动包含外部 API 调用，组合副作用需要单独的一致性设计。

## 示例：更新失败时仍保留约定的数据规则

一项测试在两次相关数据库更新之间中断操作。预期事务行为应保留有效状态、返回约定错误，并允许安全的后续尝试。样本还会覆盖从 Java 进入的可能为空的值。这些是说明方法的检查，并非客户项目成果。

升级时会记录 JDK、编译器、构建工具和依赖兼容性，并在目标配置执行相同的服务契约测试。整个系统的替换属于 [旧系统现代化](/zh/services/legacy-modernization/) 。

## 用可追溯的工程范围交付增量变更

交付包括实现、构建修改、持久化或契约样本、发布说明，以及针对实际数据变更的恢复方法。仓库保留在你的团队，并明确服务维护者和后续支持范围。

[Polity](/zh/case-studies/polity/) 在相关环境中列出 Java/Kotlin，Wavect 贡献的是 QA、审查与交付现代化。该证据对应我们的实际角色，不表示 JVM 后端最初由我们构建。持续验证可以通过 [软件质量保障](/zh/services/software-quality-assurance/) 继续开展。

## 开始前的常见问题

### 是否包含 Spring 开发？

框架支持会在检查应用及所需专业能力后确认。Java/Kotlin 服务并不等于声称熟悉所有 JVM 框架。

### 是否必须把 Java 改成 Kotlin？

不需要。混合代码库可能仍然适用。转换需要具体收益，并检查调用方、空值、构建和维护影响，不是默认交付项。

### 升级运行时只是修改配置吗？

有时是，但必须验证。编译目标、已移除的 API、构建插件和库行为都可能影响范围。我们先确定受支持的版本路径和必要回归检查。

### 回退部署能撤销数据库变更吗？

不会自动撤销。数据和结构变更需要各自的兼容性与恢复计划。交接会说明可回退的部分、需要向前修复的部分以及批准人。

## 选择合适的下一步

- [规划更广泛的系统现代化](/zh/services/legacy-modernization/)
- [验证已有业务行为](/zh/services/software-quality-assurance/)
- [开发原生移动应用](/zh/services/mobile-apps/)

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