Java JRE 11 在哪里？

Where is JRE 11?

提问by Mir-Ismaili

UPDATE:

更新：

^{(to be more clear)}

^{（更清楚）}

You can find JRE 8, JRE 9and JRE 10on Oracle's official website (click on each). But where is JRE 11?!

您可以在 Oracle 的官方网站上找到JRE 8、JRE 9和JRE 10（分别点击）。但是JRE 11在哪里？！

Also, JDK 11 doesn't include a JRE. I was expecting JRE to be installed with JDK.

此外，JDK 11 不包含 JRE。我期待 JRE 与 JDK 一起安装。

Do final users of our apps need to install JDK?

我们应用的最终用户是否需要安装 JDK？

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ORIGINAL version of the question:

问题的原始版本：

I downloaded and installed Oracle JDK 11 from its official site. I installed both ..._linux-x64_bin.rpmand ..._windows-x64_bin.exe(first on a Linux machine and second on a Windows machine). But I saw an unexpected thing! Where is JRE?

我从其官方网站下载并安装了 Oracle JDK 11 。我安装了 ..._linux-x64_bin.rpm和..._windows-x64_bin.exe（首先在 Linux 机器上，第二在 Windows 机器上）。但是我看到了一个意想不到的事情！JRE在哪里？

This is a snapshot of installation path on CentOS 7. As you can see there is no jrefolder:

这是 CentOS 7 上安装路径的快照。如您所见，没有jre文件夹：

# ls /usr/java/jdk-11.0.1/
bin  conf  include  jmods  legal  lib  README.html  release

Same snapshot about Oracle JDK 8 (See jrefolder specially):

关于 Oracle JDK 8 的相同快照（jre特别参见文件夹）：

# ls /usr/java/jdk1.8.0_191-amd64/
bin             lib          src.zip
COPYRIGHT       LICENSE      THIRDPARTYLICENSEREADME-JAVAFX.txt
include         man          THIRDPARTYLICENSEREADME.txt
javafx-src.zip  README.html
jre             release

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Same snapshots on Windows machine:

Windows 机器上的相同快照：

> dir /b "C:\Program Files\Java\jdk-11.0.1" 
bin                                           
conf                                          
COPYRIGHT                                     
include                                       
jmods                                         
legal                                         
lib                                           
README.html                                   
release                                                                                     

> dir /b "C:\Program Files\Java\jdk1.8.0_181"  
bin                                           
COPYRIGHT                                     
include                                       
javafx-src.zip                                
jre                                           
lib                                           
LICENSE                                       
README.html                                   
release                                       
src.zip                                       
THIRDPARTYLICENSEREADME-JAVAFX.txt            
THIRDPARTYLICENSEREADME.txt 

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On Windows machine, there are also two another differences between JDK 8 and JDK 11.

在 Windows 机器上，JDK 8 和 JDK 11 之间还有另外两个区别。

1. A standalone JREalongside JDKas you can see:

   > dir /b "C:\Program Files\Java"            
   jdk-11.0.1   
   jdk1.8.0_181 
   jre1.8.0_181 
   

2. In path C:\Program Files (x86)\Common Files\Oracle\Java:

   > dir "C:\Program Files (x86)\Common Files\Oracle\Java"                                                                   
   ...                                                                                                                   
   ...                14 java.settings.cfg                                                                  
   ...    <JUNCTION>     javapath [C:\Program Files (x86)\Common Files\Oracle\Java\javapath_target_3015921] 
   ...    <DIR>          javapath_target_3015921 
   ...
   

   As you see javapath(that is in PATHenvironment variable) points to javapath_target_3015921. This folder contains 3 executables of JDK 8 (that aren't links!):

   > dir /b "C:\Program Files (x86)\Common Files\Oracle\Java\javapath" 
   java.exe                         
   javaw.exe                        
   javaws.exe 
   

1. 如您所见，一个独立的JRE旁边JDK：

   > dir /b "C:\Program Files\Java"            
   jdk-11.0.1   
   jdk1.8.0_181 
   jre1.8.0_181 
   

2. 在路径中C:\Program Files (x86)\Common Files\Oracle\Java：

   > dir "C:\Program Files (x86)\Common Files\Oracle\Java"                                                                   
   ...                                                                                                                   
   ...                14 java.settings.cfg                                                                  
   ...    <JUNCTION>     javapath [C:\Program Files (x86)\Common Files\Oracle\Java\javapath_target_3015921] 
   ...    <DIR>          javapath_target_3015921 
   ...
   

   如您所见javapath（在PATH环境变量中）指向javapath_target_3015921. 此文件夹包含 JDK 8 的 3 个可执行文件（不是链接！）：

   > dir /b "C:\Program Files (x86)\Common Files\Oracle\Java\javapath" 
   java.exe                         
   javaw.exe                        
   javaws.exe 
   

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Finally, I searched the web to find a standalone JRE and found out it doesn't exist!

最后，我在网上搜索找到一个独立的 JRE，发现它不存在！

Do final users of our programs need to install JDK?

我们程序的最终用户是否需要安装 JDK？

采纳答案by dunni

The whole structure with Java 11 has changed. Java is now a modular platform, where you can create your own "JRE" distribution with specifically the modules that you need to run your application.

Java 11 的整个结构发生了变化。Java 现在是一个模块化平台，您可以在其中创建自己的“JRE”发行版，其中包含运行应用程序所需的特定模块。

The release notes at https://www.oracle.com/technetwork/java/javase/11-relnote-issues-5012449.htmlhave the following sentence:

https://www.oracle.com/technetwork/java/javase/11-relnote-issues-5012449.html 上的发行说明有以下句子：

In this release, the JRE or Server JRE is no longer offered. Only the JDK is offered. Users can use jlink to create smaller custom runtimes.

在此版本中，不再提供 JRE 或服务器 JRE。仅提供 JDK。用户可以使用 jlink 创建更小的自定义运行时。

Documentation about jlink: https://docs.oracle.com/en/java/javase/11/tools/jlink.html

jlink 文档：https: //docs.oracle.com/en/java/javase/11/tools/jlink.html

And another article about it: https://medium.com/codefx-weekly/is-jlink-the-future-1d8cb45f6306

还有另一篇关于它的文章：https: //medium.com/codefx-weekly/is-jlink-the-future-1d8cb45f6306