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Communicating between Java SSLSocket and HTML5

Just a quick question, can I use SSL in html5 with websockets to communicate with my java server that is using SSLSockets?
I have been trying to connect using another java client using ssl sockets, which works, but I have not tried to do it through html5. Is it even possible?
For the record, I am using github pages to host my server, and I have a custom domain provided by Namecheap and an SSL certificate from Comodo.
Is it even possible to communicate between java and html5 using SSL?

WebSockets are not the same as "normal" TCP sockets but instead a protocol layer on top of TCP. And thus WebSockets over SSL can not communicate directly with SSLSockets. To communicate with WebSockets (with or without SSL) you would need a library implementing the WebSocket protocol.

proxy server which can handle both http and https requests - java

i am here looking for resources or sample code for proxy server which can handle both http and https requests written in java. i searched google and found lot of data on how to handle http requests but not https.

A proxy cannot handle HTTPS and still provide end to end security. It is not possible using SSL/TLS which is what HTTPS is built on.
And a proxy that doesn't provide end-to-end security only has limited utility. So I'm not surprised you can't find an existing implementation.

I'm assuming that you want a normal HTTPS proxy here, that is a proxy that will not look into the request but merely relay all the traffic to the actual HTTPS server after the user-agent has used the HTTP CONNECT method. This is how HTTP proxy servers are normally used for HTTPS requests by browsers.
I haven't tried, but you could look at Jetty and its ConnectHandler.

Can you connect an HTML5 web socket to a Java Socket?

I had set up a system that had a Java program running on a server and a Java applet embedded in a page on a client's browser and the two communicating via Java sockets. I'm wondering if I can switch over from a Java applet to just HTML5 and javascript, using a WebSocket on the client side for communication with the Java socket on the server.
Is there a simple way to make a WebSocket communicate with a Java Socket?

Is there a simple way to make a WebSocket communicate with a Java Socket?
From what I understand, WebSocket works by the client side opening a port 80 connect to the server side, and sending a variant HTTP 1.1 request to the server to negotiate a WebSocket connection. If the server recognizes this, it will send a suitable response, and then allow the still open TCP connection to be used for full-duplex client-server interactions.
It looks like it would be possible to quickly put together a server-side that just understood WebSocket negotation and not full HTTP. However, I think you are better off looking at existing WebSocket implementations, including those embedded in HTTP servers / protocol stacks.
This Wikipedia page compares a number of WebSocket implementations, and should help you in deciding which server-side implementation to use.
But to directly answer your literal question, a WebSocket client can only connect to a WebSocket-aware server; i.e. that one that can perform the initial negotiation. (On the client side, you could implement starting from a bare Socket, but you would need to implement all of the "HTTP stuff" on top of that ... for the setup phase.)

Nope, you cannot communicate using regular sockets with client WebSockets.
WebSockets are special HTTP requests, with an upgrade in the HTTP Header, and a standard protocol to establish a connection (see the official RFC doc).

Connecting to an RMI server that sits behind a firewall?

I know my RMI app works correctly - it works fine when the server is on localhost and inside the LAN but when connecting to an external RMI server it fails when trying to make stub calls
So the server is bound to localhost (an internal IP - 192.168.1.73) but the client is specifying an external IP (45.4.234.56) - which then gets forwarded to the internal server. How do you resolve this problem?
thanks

The "simplest" approach is for your network admin to add IP forwarding from a specific port on the firewall to your server.
Assuming this isn't an option (and it probably isn't), then RMI supports tunnelling over HTTP. The performance is poor, but it's much more firewall-friendly.
http://java.sun.com/javase/6/docs/technotes/guides/rmi/faq.html#firewallOut
This well-worn method is popular since
it requires almost no setup, and works
quite well in firewalled environments
which permit you to handle HTTP
through a proxy, but disallow regular
outbound TCP connections.
If Java RMI fails to make a normal (or
SOCKS) connection to the intended
server, and it notices that a HTTP
proxy server is configured, it will
attempt to tunnel Java RMI requests
through that proxy server, one at a
time.

java tcp ip socket programming regardless of proxy type

How to write TCP IP socket programming in java. If the client is behind any type of proxy (may be http or socks or no proxy).
Thanks
Bapi

When I faced such kind of problem I had to code myself http layer (over HTTP CONNECT) and used existing (in standard library) socks layer. However the main problem is to get the proxy settings. As far as I was doing it for a Web Start application, I could use default browser settings.