As other folks have mentioned, Java, ActiveX, Silverlight, Browser Helper Objects (BHOs) and other plugins are not supported in Microsoft Edge. Most modern browsers are moving away from plugins and toward standard HTML5 controls and technologies.
If you must continue to use the Java plugin in a corporate web app, consider adding the site to an Enterprise Mode site list. This will automatically prompt the user to open in IE.
Answer from Ryan Joy on Stack OverflowAt work, we have a website called perseptivecloud.com/webnow It's what people here is to access accounting things. The page uses Java. The page just never loads, it stays at a white screen. I've removed Java and tried multiple versions, same thing. I've tried IE, Chrome and Firefox. Same thing. I then go Oracle website and try to download the Java version checker and the uninstaller to see if I missed something. The page says the box will pop up within a minute. It never did. So I'm thinking the problem is somewhere in the settings. I have the TLS 1.0, 1.1 and 1.2. the JavaScript is enabled as well. And in the Java settings the use in browser is enabled too. So I'm stuck. Anyone have any similar problems?
How do I enable Java in Microsoft Edge web browser? - Stack Overflow
Module requires Java to function, but your browser does not support Java
java not running in any browser - Stack Overflow
Java isn't working in browsers
As other folks have mentioned, Java, ActiveX, Silverlight, Browser Helper Objects (BHOs) and other plugins are not supported in Microsoft Edge. Most modern browsers are moving away from plugins and toward standard HTML5 controls and technologies.
If you must continue to use the Java plugin in a corporate web app, consider adding the site to an Enterprise Mode site list. This will automatically prompt the user to open in IE.
You cannot open Java Applets (nor any other NPAPI plugin) in Microsoft Edge - they aren't supported and won't be added in the future.
Further you should be aware that in the next release of Google Chrome (v45 - due September 2015) NPAPI plugins will also no longer be supported.
Work-arounds
There are a couple of things that you can do:
Use Internet Explorer 11
You will find that in Windows 10 you will already have Internet Explorer 11 installed. IE 11 continues to support NPAPI (incl Java Applets).
IE11 is squirrelled away (c:\program files\internet explorer\iexplore.exe). Just pin this exe to your task bar for easy access.
Use FireFox
You can also install and use a Firefox 32-bit Extended Support Release in Win10. Firefox have disabled NPAPI by default, but this can be overridden. This will only be supported until early 2018.
If you are using 64-bit Windows, only IE supports 64-bit Java. Chrome and Firefox will only work if you install the 32-bit Java.
For more details - Google support
it is an easy fix , I also had a lot of trouble with java in chrome
go to this web site http://www.java.com/en/javafx/
chose the 32 bit java FX for most people download and install your problem is ficex
I still have problem with emails though
Running Java applets on the web via the Java browser plug-in (which uses the old "Netscape Plugin Application Programming Interface": NPAPI), is generally insecure. In fact, loading any plug-ins via NPAPI is considered insecure, so all the major browser makers are moving away from it.
Oracle recommends Microsoft Internet Explorer for people on Windows who still want to run Java applets in their browser. Internet Explorer 11 still supports NPAPI plug-ins, including Java. You can even run it on Windows 10. You don't have to run Edge, Microsoft's modern browser, if you don't want to.
Mozilla Firefox's "Extended Support Release" (ESR) apparently still supports NPAPI and thus Java.
You may need to go to Java.com to download and install the latest version of Java, to make sure the latest Java NPAPI web browser plug-in gets installed correctly.
Because of these browser changes, modern websites have abandoned Java and Flash for interactive features. Art creation "apps" on the web are built with native web technologies like JavaScript (which is a totally different technology than Java, despite the name) and canvas nowadays. These are safer technologies that are built into every browser.
If you really still need to run a Java applet after the last NPAPI browsers are gone, there may be ways to download them and run them from your own hard drive, but that's a bit beyond the scope of this question.
To elaborate on Spiff's answer, since it wouldn't easily fit in a comment:
Firefox ESR seems to work with java applet if it's 32-bit, and as long as you can keep it on v 52.x and disallow the auto updater from working. Download here.
After installing it, download 32 bit java (the non "64 bit" offline option--possibly remove any previous 64 bit java first, if necessary, to avoid a "1603 install failed" message, though sometimes the two"just work" together). Restart firefox after installing java.
Whenever there's a prompt for "firefox software updater" click "no" otherwise it might update it to 59. It'll allow you to load the plugin on pages now, but it's an "opt in, allow for this particular web page at a time".
Now test if applets are working here: https://www.java.com/en/download/installed.jsp
If you go with IE it works and isn't an opt-in (i.e. works "even better")--seems to require 32-bit JRE otherwise it just pops up a message "this website uses java" but despite saying OK, it still doesn't take, weird.
Another option: installed firefox portable ESR 52 version. By default it launches in either 64 or 32 bit mode "depending on the OS" (we want it to always launch in 32 bit mode), so to enforce that, copy "the FirefoxPortable.ini configuration file from the FirefoxPortable\Other\Source directory to the FirefoxPortable directory and editing it to add AlwaysUse32Bit=true" (thanks to grawity for the tip)
You may be able to use an "appletviewer" debug tool.