Tried writing a reference server using jdk httpServer

[Vaivaswat2244]

This PR introduces ReferenceServer.java, a lightweight HTTP server to serve Processing's reference documentation locally. It replaces the previous approach with a more maintainable and efficient solution using Java's built-in HttpServer.

Changes Implemented

• Used com.sun.net.httpserver.HttpServer from the JDK

• Handles different MIME types (HTML, CSS, JS, images, etc.).

• Runs on a separate thread to avoid blocking the main Processing IDE.

Later in this pr I will add the download modifications in the JavaEditor.java file, which is the only file find I found where the WebServer was being used

Maintainer edit: Fixes #980

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[SableRaf]

Nice work @Vaivaswat2244!

I didn't have a close look at the code but the server runs fine for me. I left a minor comment about the JDK version. Feel free to mark this as a draft PR and switch it back when it's ready for a review.

Looking forward to seeing the download part!

Thanks for your contribution 💙

[Vaivaswat2244]

I updated the source link for the download and also replaced the WebServer class.
The download is getting completed and the reference zip folder is getting stored on
/home/[username]/sketchbook/reference.zip (using ubuntu)

Now I'm not sure how to automate this version checking system. I researched a bit and found that using Github apis is the most suitable way for tracking version. I can try that.
Also wanted to know if this is what we intended with the issue originally

[Stefterv]

Hi @Vaivaswat2244 Thank you for your work on this, looking good! The current version of Processing is available to you in your code through Base.getRevision() and Base.getVersionName()

[Vaivaswat2244]

hey @SableRaf @Stefterv ,
I made this function as suggested using Base.getVersionName(); and Base.getRevision() and used it in the

private void downloadReference() {
    try {
      URL source = new URL(getReferenceDownloadUrl());

private String getReferenceDownloadUrl() {
  String versionName = Base.getVersionName();
  String revision = String.valueOf(Base.getRevision());
  
  System.out.println("Processing Version Name: " + versionName);
  System.out.println("Processing Revision: " + revision);
  
  if (versionName != null && !versionName.isEmpty() && 
      revision != null && !revision.isEmpty()) {
    String url = String.format(
      "https://github.com/processing/processing4/releases/download/processing-%s-%s/processing-%s-reference.zip",
      revision, versionName, versionName);
    System.out.println("Generated URL: " + url);
    return url;
  } else {
    System.out.println("Using fallback URL");
    return "https://github.com/processing/processing4/releases/download/processing-1300-4.4.0/processing-4.4.0-reference.zip";
  }
}

In logs I got Version Name: "unspecified" and Revision: 2147483647 (which is Integer.MAX_VALUE)
I'm not sure as though why is it happening. Is it because the development build doesn't have proper version info or something else

[Stefterv]

Hey @Vaivaswat2244 that is correct, those are the values that are expected in the development build 😅

[Vaivaswat2244]

So should I commit the changes?

[Stefterv]

Looks good! Thank you!

If you can delete the old WebServer.java as well that would be great, otherwise we'll delete it later.

[Vaivaswat2244]

Sure @Stefterv, I have deleted the WebServer class as well.