How to attach JavaDoc .jar for library .jar and get editor to show the documentation?

From @mattflix on February 23, 2019 19:58

I have tried various techniques to specify the JavaDoc .jar that should be attached to a given library .jar (that appears in the "Referenced Libraries" section of the "JAVA DEPENDENCIES" view, and is successfully used by my app), but nothing has worked.

Currently, the only JavaDoc documentation that appears in the editor for me is that for the built-in objects/members, like Object and toString(). No third-party libraries seem to have any JavaDoc exposed in the editor.

Is there any example of a simple project configured with a dependency on a library .jar (that has an associated JavaDoc .jar, also located on the local file system) where the editor is able to display the documentation comments for selected Java types and members?

Copied from original issue: Microsoft/vscode-java-pack#105

未指定文件、测试或入口点。使用本地库 .jar 和关联的 JavaDoc .jar 复现这个简单项目，然后验证编辑器中是否会显示第三方 Java 类型和成员的文档；有记录的可用配置或已确认的缺陷即表示完成。