即将“再次”免费的JDK

小灰灰 2022-09-14 00:22 419阅读 0赞

Oracle JDK，从jdk-8u201开始，就改成收费了，《[JDK的版本号解惑][JDK]

> The new license permits certain uses, such as personal use and development use, at no cost -- but other uses authorized under prior Oracle JDK licenses may no longer be available.

注意到JDK8这提到了两个8u211和8u202，这其实就是个分水岭，JDK8 8u202及以下是免费的，从JDK8 8u211及以上，就都是收费了，

![4bdbf4eae319cfcedc97e8b897bd8fd8.png][]

例如JDK 16，明确说了JDK不在开源协议下，

![7d1e3282dce1a677f36a14fc37d9f562.png][]

但是在Oracle最新即将推出的JDK 17，再次官宣免费了，Oracle JDK根据二进制代码许可协议获得许可，

> JDK 17 binaries are free to use in production and free to redistribute, at no cost, under the Oracle No-Fee Terms and Conditions License.

https://www.oracle.com/java/technologies/downloads/

P.S. OpenJDK根据GPL v2许可获得许可。

JDK 17是Java SE平台版本17的开源参考实现，由JSR 392在JCP(Java Community Process)指定，

![d8ff68c9152556c3151a2f6914cc9294.png][]

具体许可协议，可以参考，

https://www.oracle.com/downloads/licenses/no-fee-license.html

> Your use of this Program is governed by the No-Fee Terms and Conditions set forth below, unless you have received this Program (alone or as part of another Oracle product) under an Oracle license agreement (including but not limited to the Oracle Master Agreement), in which case your use of this Program is governed solely by such license agreement with Oracle.
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JDK为什么闭源到了现在，选择开源了？虽然从官方没找到任何原因，但其中可能的一个原因，就是对Java技术使用范围的推广。众所周知，SUN公司被Oracle收购前，JDK一直都是免费的，Java应用、Java程序员、Java开源社区，可以说都是蓬勃发展的。但是当Oracle JDK出现，不仅是名称改了，JDK8开始选择闭源，直接导致很多企业级应用在选择技术栈语言的时候，不得不重新考量，是否存在替代Java的技术，毕竟Oracle作为一家顶级技术企业，对知识产权的保护我们有目共睹，谁都不想让自己的应用，某天因为版权问题遭到重创。同时各种开源语言的发展，非常迅猛，例如Python、Go等，在一定程度上，Java不再不可替代。

数字说明更直接，我们参考TIOBE编程语言社区排行榜，他是编程语言流行趋势的一个指标，这是9月最新的，Java排在前三甲，但是被C和Python压制，

![d425c8626ce52b8f2f24f6edf39a0cd4.png][]

P.S.

1. https://www.tiobe.com/tiobe-index，这份排行榜排名基于全球技术工程师、课程和第三方供应商的数量，每月更新，其中包括了流行的搜索引擎以及技术社区，如 Google、百度、维基百科、CSDN、必应、Hao123等。

2. 这个排行榜只是反映某个编程语言的热门程度，并不能说明一门编程语言好不好，或者一门语言所编写的代码数量多少。这个排行榜可以用来考察你的编程技能是否与时俱进，还可以在开发新系统时作为一个语言选择依据。

3. 具体计算方式，https://www.tiobe.com/tiobe-index/programming-languages-definition/

从这张折线图更能反映出问题，绿色线的Java，明显下降，而且和其他语言的差距在缩小，

![465cfde39d70e324977e0dd21bd075de.png][]

最近的年度编程冠军，都是被C、Python包揽了，

![a03222700dbeffc13816c160a6cd80a8.png][]

可能正是看到Java现在的状态，才让Oracle做出了JDK 17免费的决策，但是从商业角度，现在的免费，不代表未来都会免费的，商场如战场，策略会随着时局的改变而改变，因此在做技术选型的时候，还是应该充分考量技术的发展，以及业务的需求，选择最合适的，而不是外界认为最佳的，才是最重要的。

**近期更新的文章：**

《["裸金属"是什么？][Link 1]

《[数据管理，数据治理，数据管控][Link 2]

《[JSQLParser碰到的问题][JSQLParser]

《[高刷屏是什么？][Link 3]

《[最近碰到的问题][Link 4]

**文章分类和索引：**

[《公众号800篇文章分类和索引][800]

[JDK]: https://blog.csdn.net/qq_33547321/article/details/112736395
[4bdbf4eae319cfcedc97e8b897bd8fd8.png]: /images/20220828/10e3ee21b4dd4e8da8be736f6b3fe8c3.png
[7d1e3282dce1a677f36a14fc37d9f562.png]: /images/20220828/c227fb73cded4dc1b0f7eea8a3d384d0.png
[d8ff68c9152556c3151a2f6914cc9294.png]: /images/20220828/d7c17026a48d4e58b04df89188b10c70.png
[d425c8626ce52b8f2f24f6edf39a0cd4.png]: /images/20220828/e238c09ec61943eba04cae451ed9de5c.png
[465cfde39d70e324977e0dd21bd075de.png]: /images/20220828/2b010e3584a04110a4735cd6ae312661.png
[a03222700dbeffc13816c160a6cd80a8.png]: /images/20220828/d38e0b95138642d684097a586881d80a.png
[Link 1]: https://blog.csdn.net/weiqin19930619/article/details/87868045
[Link 2]: https://blog.csdn.net/netsec_steven/article/details/105537310
[JSQLParser]: https://blog.csdn.net/qq_38377190/article/details/106327284
[Link 3]: https://blog.csdn.net/weixin_38753213/article/details/100930971
[Link 4]: https://blog.csdn.net/LeeCoding/article/details/52118386
[800]: https://blog.csdn.net/bisal/article/details/95272878