Java 如何在 Windows 上获取 OpenJDK 11 的 tools.jar？
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How to get tools.jar for OpenJDK 11 on Windows?
提问by R Y
Background: I am trying to build Hadoop for Windows using instructions found here. I have OpenJDK 11and have ran into the following issue while running mvn package:
背景：我正在尝试使用此处找到的说明为 Windows 构建 Hadoop 。我有OpenJDK 11并且在运行时遇到了以下问题mvn package：
Could not resolve dependencies for project org.apache.hadoop:hadoop-annotations:jar:2.5.0-SNAPSHOT: Could not find artifact jdk.tools:jdk.tools:jar:1.6 at specified path C:\Program Files\Java\jdk-11.0.1\..\lib\tools.jar
Could not resolve dependencies for project org.apache.hadoop:hadoop-annotations:jar:2.5.0-SNAPSHOT: Could not find artifact jdk.tools:jdk.tools:jar:1.6 at specified path C:\Program Files\Java\jdk-11.0.1\..\lib\tools.jar
I realised no tools.jarexists in the Windows build of OpenJDK 11. Would I have to build this from source as well? How can I get the tools.jarMaven artefact for OpenJDK 11?
我意识到tools.jarOpenJDK 11 的 Windows 版本中不存在。我是否也必须从源代码构建它？如何获取tools.jarOpenJDK 11的Maven 人工制品？
采纳答案by Edwin Buck
It was removed in JDK 9.
它在 JDK 9 中被删除。
JEP 220 removed the well-known and frequently-referenced JARs rt.jar and tools.jar. According to it's description, "The class and resource files previously stored in lib/rt.jar, lib/tools.jar, lib/dt.jar, and various other internal jar files will now be stored in a more efficient format in implementation-specific files in the lib directory.
JEP 220 删除了众所周知且经常引用的 JAR rt.jar 和 tools.jar。根据它的描述，“以前存储在 lib/rt.jar、lib/tools.jar、lib/dt.jar 和各种其他内部 jar 文件中的类和资源文件现在将在实现中以更高效的格式存储- lib 目录中的特定文件。
I suggest you use a updated version of Apache Hadoop, or if the updated version also doesn't support Java 11, downgrade your Java to 1.8.
我建议您使用更新版本的 Apache Hadoop，或者如果更新版本也不支持 Java 11，请将您的 Java 降级到 1.8。
For example, the current stable Apache Hadoop is version 2.9.2, and in its instructions on how to install, it specifically references JDKs before JDK 9. For its proper support, I suggest you use OpenJDK 1.8
比如目前Apache Hadoop的稳定版本是2.9.2，在安装说明中专门引用了JDK 9之前的JDK。为了得到适当的支持，建议你使用OpenJDK 1.8
There is a Hadoop 3.1.1, and if you find the Java version is critical to your success, I'd look into that.
有一个 Hadoop 3.1.1，如果您发现 Java 版本对您的成功至关重要，我会研究一下。
