Is it possible to embed an applet in HTML so that it will be displayed within the browser window yet launched through Java Web Start via a JNLP file instead of using the browser's Java plugin? If so, how is this done?
I've only been able to launch my applet in a standalone window, but disliking the user experience pop-ups create, I'd prefer that it be embedded in the browser window.
I'd like to use JWS instead of the plugin because I need to control my applet's maximum heap size, which I don't believe is possible with the browser plugin, at least not on Mac OS 10.5.
In-browser applets support JNLP deployment since 1.5 (or so). There's an example on how to do it here: http://java.sun.com/javase/6/docs/technotes/guides/jweb/deployment_advice.html
You're still using the Java plugin then, of course. It may or may not work to set the heap size.
Related
I am running a Java applet in the browser. However, each browser displays a warning of
"This applet may not be trusted... etc."
and the user is allowed to click Run Anyway or Cancel. This is built in to the browsers / Java configuration. (If the user is running on a security level > Medium, the applet is simply blocked.)
Is there a way for me to sign the applet in such a way that no dialogs appear? Or will they still appear even if the applet is "trusted"?
No, you cannot.
It is no longer generally considered safe to run Java in the browser. The Java plugin has implemented a number of security measures that will display a spectrum of different security warnings depending on the user's current Java security level and the signed status of the applet, but no settings will disable the warnings entirely (short of settings which block the applet from loading at all). Additionally, some web browsers and operating systems have begun to apply their own, separate restrictions to Java applets. For instance, Google Chrome will display a warning bar before attempting to load the Java plugin, and Mac OS X does not install Java at all by default.
If you have any choice in the matter, avoid writing Java applets. Like many other older web technologies, like Shockwave and Quicktime, they are part of the past, not the future.
This is the question: can JWS app occupy requin on web page or represent entire web page and/or access browser state parameters?
A Java Web Start application runs independently of the browser. If you want a Java app to interact with the hosting browser, you have to make it an applet.
See the last link in the applet info. page.
JNLP Support in the Next Generation Java Plug-In Technology (introduced in Java SE 6 update 10) goes into further details of the new abilities of applets.
I high-lit the version since it is a recent ability, and I got the impression you wanted to support older browser/JRE combos. from your earlier question.
That page expands..
The next-generation Java Plug-In technology (hereafter the "Java Plug-In") provides support for launching applets directly from JNLP files. Previously, only Java Web Start utilized JNLP files, for the purpose of launching Java applications. Now Java applets can be described using the same meta-descriptor.
Also note that launching an embedded applet using JWS does not solve any of the problems that inherently come with embedding a rich client GUI into the lighter HTML GUI.
Focus problems between HTML elements and the applet or applets. Sun never bothered to try and define what should happen, which resulted in either the applet or HTML getting focus, and that was it (as far as the keyboard went).
Then there is the matter of the PLAF of the applet which mimics, but never quite matches that of the elements used for HTML forms. Especially if they are styled, and that brings me to..
Applets do not respond to CSS! Perhaps intuitively obvious to applet developers, but no end of frustration to the site designer.
Typically there is at least one version of one browser that cannot load the simplest of applets correctly. My 'favorite' of all these type of bugs was a FF version that reloaded applets if the user scrolled 'up'. I could go on, and on, and on..
Is it still possible to start a 'native' application under windows via a java applet in a browser? IE "Click here to start notepad.exe" on a web page. The most recent reference I could find for this was dated 2002. Im wondering if this model / concept is no longer supported.
Yes, but the applet has to be signed.
Signed applets will prompt the user to give them permission. Once given, the applet has the same rights as any application running on the machine, including the ability to launch native apps (or link native libraries, which I've had to do in the past).
..Is it still possible to start a 'native' application under windows via a java applet in a browser?
Sure thing. As mentioned in other replies, a signed (and trusted) applet can use Runtime.exec(String) to launch a native application.
As of Java 1.6, it becomes simpler with the implementation of Dekstop.getDesktop.open(File), which will open the selected File with whatever application the OS has registered as a consumer for that file type.
As of Sun's Plugin2 architecture (1.6.0_10+ in a Sun/Oracle JRE) offers a more generic method for an (sand-boxed) applet embedded in a web page, using the JNLP API's BasicService. Here is my demo. of the BasicService
The portable way of doing this is to create a signed Applet.
I want to host my XUL application inside another Java application that uses SWT.
I know that it is possible to embed the browser windows using SWT.MIZILLA as a flag.
But how do I host my XUL application inside that browser window?
You should be able to load your XUL file using Browser.setUrl() method. If you are on Linux, no need to specify SWT.MOZILLA (as embedded Firefox is also capable of loading XUL). Be careful when using SWT 3.7 (its M1 is just released), as it uses WebKitGtk+ as the default browser on Linux.
i'm trying to build a Java applet and i'm having a major problem trying to set up my development environment because my applet has bugs in it but I can't fix them easilly because Java won't get the latest version of the applet. I've turned off caching in "Java Preferences.app".
I want to set it so that applet wil not be cached at all, as any bugs can easilly be ironed out.
I'm using the latest (on Leopard) XCode and Safari 4.
Thanx,
kenny
Applet Caching
SUMMARY:This new feature is activated
by including the new PARAM
NAME="cache_option" and PARAM
NAME="cache_archive" values in the tag
that specifies the use of Java Plug-in
as below: The cache_option attribute
can take one of three values:
No
Disable applet installation. Always
download the file from the web server.
Browser
Run applets from the browser cache
(default).
Plugin
Run applets from the new Java Plug-in
cache.
EDIT:
Caching Option
Steps to Turn off Java Applet Caching