我想问一下oracleJDK和官网下的免费JDK是一个吗？

Posted 2023-05-13

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只要版本一致就是一个，JAVA现在是oracle的，他出的就是武林正派，所以java的官网和oracle官网就是一个，没区别。
openjdk之类的就属于第三方，oracle官网也不提供下载的。追问

那么我现在在官网下oracle jdk等到以后要付费了是不是还可以用

参考技术A 是同一个, 因为官网就是oracle
还有一个不同的是开源的openJdk 参考技术B JDK都是免费的，自从Oracle收购sun之后，JDK已经是Oracle的了，所谓的官网还是oracle的官网

即将“再次”免费的JDK

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

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，

例如JDK 16，明确说了JDK不在开源协议下，

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，

具体许可协议，可以参考，

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

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Last updated: 12 September 2021

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，