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How to display JFrame application in browser without Applets

I'm currently developing a 3D game in Java using JFrame. I want to make the program playable through a browser, which I had heard could be done using the Applet class. However, I've just discovered that the Applet class has been deprecated!
What alternatives, if any, are there to Applets for making JFrame based applications available in-browser?

A JFrame cannot be displayed within a browser.
What you can do is to put your GUI on a JPanel which you should be able to add to either a JFrame or a JApplet by invoking setContentPanne(yiur_panel_here).
JApplets (and AWT Applets can be displayed by a Java-enabled browser.

Java Swing, create a panel over a window by its hwnd handler

I'm writing a java app and at some point I create a window using Windows API through JNI.
How can I create a jpanel over a part of that window so I can add gui to it in the java side?
If that's not possible, then can I create a window in java and set it's parent to the first
window to achieve a similar result?

Java Window in another Window

Multi-window applications often have a main-window, and all other windows are kind of 'parented' to it. Minimizing such a sub-window will hide its content and show the title-bar at the bottom-left of the screen. Also, these windows do not have their own Icon in the Task-bar, only the main-window does.
How can I make a window being attached this way to another window?
If that is possible, is it also possible without a referenfe to the actual main window?
#2: I'm embedding Java into such an application and I would like to be able to use awt or swing additionally to the native dialogs, which have this behavior by default.

See How to Use Internal Frames.

have look at JInternalFrames for MDI application
read Oracle tutorial, try code example

Create child Window of another process's HWND? (e.g. screensaver preview)

I'm writing a screensaver in Java. It's primarily for Windows, though I'd prefer it to be as portable as practical.
According to http://support.microsoft.com/kb/182383, when a screensaver is invoked with command line args /p HWND, the screensaver should "Preview Screen Saver as child of window ." Presumably this is how screensavers should their little preview in the Screen Saver Settings dialog.
So how, in Java, do you create a JFrame or JComponent that's a child of a window that belongs to somebody else?
I've looked at Embed HWND (Window Handle) in a JPanel
which is sort of the reverse question: The developer controls the parent window and wants to embed a child window. In my case, I control a child component that I want into embed into a parent that is not "mine". Can I use JNA to do that?
I'd rather not have to maintain C code in addition to Java code. (So JNI is not preferred.) I understand that JDIC was supposed to meet this kind of need, but I've read that JDIC is essentially dead.
I'm running Windows 7, FWIW.

Have a look at Jdic, it has an SDK for screensavers, so at least you may study their code..

You need to call a win32 api. That api is in C. You'll need to the interop layer to do this. I think every option will be gross.
For Java, I think that is JNI. See this on how to do it.
You will also need to pass that value to SetParent.
The screen saver runs at the same security rights as the screensaver dialog so this isn't a security issue.

Swt.browser inside of Jpanel

How can I put a swt.browser inside of a Jpanel?

There is SWTSwing, although it's not clear if it supports the Browser component.
If you're looking for a native browser in Java, the jdic project can render Internet Explorer into a swing component. See https://jdic.dev.java.net/documentation/incubator/JDICplus/index.html
Possibly more complete and current is the embedded browser support in NetBeans.
http://wiki.netbeans.org/EmbeddedBrowserPlan68