RFR: 8245095: Implementation of JEP 408: Simple Web Server

[Andrey Turbanov]

On Tue, 14 Sep 2021 08:52:37 GMT, Julia Boes <jboes at openjdk.org> wrote:

> This change implements a simple web server that can be run on the command-line with `java -m jdk.httpserver`.
> 
> This is facilitated by adding an entry point for the `jdk.httpserver` module, an implementation class whose main method is run when the above command is executed. This is the first such module entry point in the JDK.
> 
> The server is a minimal HTTP server that serves the static files of a given directory, similar to existing alternatives on other platforms and convenient for testing, development, and debugging.
> 
> Additionally, a small API is introduced for programmatic creation and customization.
> 
> Testing: tier1-3.

src/jdk.httpserver/share/classes/com/sun/net/httpserver/Headers.java line 288:

> 286:     }
> 287: 
> 288:     private static final Headers EMPTY = new UnmodifiableHeaders(new Headers());

IDEA warns here:
>Referencing subclass UnmodifiableHeaders from superclass Headers initializer might lead to class loading deadlock
>Such references can cause JVM-level deadlocks in multithreaded environment, when one thread tries to load the superclass and another thread tries to load the subclass at the same time.

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PR: https://git.openjdk.java.net/jdk/pull/5505